Port celestial systems and seeded Age completion to 26.3 beta

README.md

@@ -14,10 +14,13 @@ The gameplay guide below describes the **Minecraft 1.21.1 release**. A separate,
 incomplete **Minecraft 26.3 beta** is available: Java 25, NeoForge 26.3.0.99,
 and a first-party Age backend (no Dynamic Dimensions or Bad Packets). It now
 supports authored terrain/biomes, structure and vegetation pages, independent
-Age weather, and a growing set of generation features,
-but does not yet provide full 1.21.1 gameplay or optional-integration parity.
+Age weather/lighting, seeded and colorable Overworld/Nether/End/Static skies,
+independent Sun/Moon controls, multiple bodies and eclipses, seeded biome and
+feature completion, and random structure selection. Nether/End noise-biome
+materials now follow their native rules. The beta does not yet provide full
+1.21.1 gameplay or optional-integration parity.
 See the [26.3 beta guide](ports/mc263/README.md) and
-[latest beta release notes](ports/mc263/RELEASE_NOTES_1.0.1.65-beta.1.md).
+[latest beta release notes](ports/mc263/RELEASE_NOTES_1.0.1.93-beta.1.md).
 Keep the builds and their saves separate, and back up worlds before updating.
 
 ## Getting started

docs/MINECRAFT_26_3_PORT.md

@@ -900,6 +900,907 @@ loaded; that fixture is not claimed as tested. The server shut down cleanly,
 and its temporary world was deleted. Actual player arrival in the affected
 Age and the unchanged Cave/Linking Book paths remain manual checks.
 
+The local `1.0.1.66-beta.1` slice ports the three 1.21.1 lighting controls.
+Normal surface types keep the host Overworld holder; Dark disables skylight,
+Bright sets ambient light to 0.25. Cave Bright is explicitly supported with
+0.25 ambient and no skylight; Cave Normal/Dark have 0.0 ambient and no skylight.
+The native vanilla registry-sync path supplies types to clients before travel.
+Generated data derives three variants from the exact 26.3 vanilla Overworld
+resource, preserving every key except has_skylight and ambient_light. The
+generator has declared inputs/outputs and depends on Minecraft artifacts.
+
+The Age index has an optional lighting map, defaulting old entries to Normal.
+Creation supplies the choice before constructing the level and saving the
+index. Restore/reload/reseed read it from the index; retirement removes it and
+failed retirement restores it before reloading. Pages share grammar/tint and
+the positive biome-page filter, avoiding the weather-only compiler regression.
+Missing lighting stays Normal until the random-trait port; Bright instability
+is pending with the instability system. No sky/celestial renderer is added.
+The static variants derive vanilla data, not arbitrary data-pack overrides
+to the host's Overworld type; broader custom type inheritance is not claimed.
+
+Build/diff checks and generated-data equality checks pass (only the two
+lighting fields differ from vanilla). A disposable server with a normal
+Overworld compiled all six surface/Cave lighting-page combinations and
+reported the expected type, skylight and ambient values. Cave Bright survived
+unload/reload and reseeding, and all six choices survived a full restart.
+Overworld skylight/ambient stayed unchanged. An earlier Superflat-host fixture
+could test surface variants but could not create Cave terrain because the
+existing backend requires a noise-based host generator; it was discarded and
+the Cave checks ran on a fresh normal-host fixture. Test servers stopped
+cleanly and both temporary worlds were deleted. Client-side appearance,
+authoring, travel, placed lights and multiplayer registry behavior are manual
+checks, not inferred from the server probes. No commit/push/publication.
+
+The local `1.0.1.67-beta.1` corrects the visual failure found in slice 66:
+LightmapRenderStateExtractor and lightmap.fsh use AMBIENT_LIGHT_COLOR, while
+dimension ambient_light only affects other brightness queries. Merely porting
+1.21.1's 0.25 field was insufficient. Bright types now provide white native
+ambient color and ambient_light 1.0; Cave Bright retains no skylight. A scoped
+NeoForge spawn-placement handler denies natural/chunk-generation MONSTER
+spawns in Bright runtime Ages, leaving passive/existing mobs, spawners,
+commands/eggs and event spawns untouched. It does not manufacture propagated
+block light or alter crop light checks. This supersedes slice 66's Bright
+appearance and natural-spawn limitation; existing Bright types update on boot.
+
+Requested follow-up for the color-page port: add ambient-light color as a
+separate authorable target using minecraft:visual/ambient_light_color. Keep
+the existing number/color mixing semantics and white Bright default; do not
+confuse ambient tint with sky/celestial color or its server spawn policy.
+Color pages themselves remain unported in this slice.
+Build/diff and generated attribute checks pass. A disposable dedicated server
+verified the registered event handler denies a successful-default natural
+zombie placement in surface/Cave Bright, leaves spawner zombies and natural
+cows unchanged, and leaves Normal unaffected. Those are isolated event-policy
+probes, not a long-running natural-spawn census. The server shut down and its
+temporary world was deleted. Actual client appearance awaits player validation.
+
+The local `1.0.1.68-beta.1` removes the requested-against MobSpawnEvent veto.
+An Age-scoped LevelLightEngine.getRawBrightness return modifier contributes
+Bright's full ambient minimum of 15 to combined brightness on both sides.
+Vanilla Monster.isDarkEnoughToSpawn now sees that light, rather than being
+overridden or filtered by mob category/spawn reason. Light-ignoring mobs and
+special spawns retain vanilla rules; no spawner exemptions are introduced.
+Block/sky storage and propagation remain physical, while combined-light
+consumers (including plant checks) see ambient light. Cave Bright retains
+no skylight, and the native white render attribute remains. This supersedes
+slice 67's separate spawn policy and unchanged-crop-light behavior.
+
+The lighting probe now calls vanilla's darkness predicate and combined
+brightness instead of constructing synthetic spawn events. Ambient-color
+authoring remains a planned part of the color-page port.
+Build/diff checks pass. A disposable dedicated server loaded the required
+mixin and reported effective brightness 15 / vanilla darkness false for
+surface/Cave Bright, versus 0 / true for Dark. These are direct brightness/
+vanilla-predicate probes, not a natural-spawn census or a fully generated
+underground-room test; an unloaded Normal column returned native sky light 15.
+The server stopped cleanly and its temporary world was deleted. Client visual
+validation remains with the player; no publication is performed.
+
+The local `1.0.1.69-beta.1` slice completes missing weather/lighting choices
+at book binding. PortEnvironmentSelection resolves explicit supported pages
+first and uses independent seed-salted Legacy-rank rolls for omissions.
+Normal is rank 1, remaining supported modes rank 2: 3:1:1 lighting and
+6:1:1:1:1:1 weather. These weights derive from the active enum pool and reuse
+the existing weighted ticket routine, rather than duplicating random-choice
+logic or enabling unported Cloudy/Rain/Snow modes. It is rank-policy parity,
+not exact seed-stream parity with 1.21.1's broader trait pool.
+
+The selected weather/lighting are passed through the existing save-before-
+catalog creation path. Restoring Ages never calls the resolver, so old Ages
+retain their saved values. Cave weather is always Off; Cave lighting remains
+independent and supports Bright. Explicit developer fixtures remain controlled,
+but create_random now uses the same resolver as pageless books. A read-only
+environment probe checks seed repeatability and explicit overrides. Superseded
+Normal-only fromPages helpers are removed. Random feature, sky/celestial,
+blocklist policy and instability work remain pending.
+Build/diff checks pass. Disposable dedicated-server probes repeated seeds
+0/4/7, verified explicit overrides and independent one-field completion, and
+confirmed Cave weather Off with Bright lighting. Three random Ages saved
+Always/Normal, Normal/Dark and Fast/Bright respectively; weather/lighting
+choices and live weather timers persisted through a full server restart.
+Overworld weather/type stayed unchanged. The server stopped cleanly and its
+temporary world was deleted. Player book-authoring/visual checks remain
+manual. No commit, push or publication is performed.
+
+The local `1.0.1.70-beta.1` slice ports native Overworld/Nether/End sky styles.
+The shared grammar accepts one style and the biome compiler ignores it by
+category. Sky is saved in an optional Age-index map with Overworld fallback;
+restore/reseed/retirement rollback use the saved choice. It does not alter
+the missing-weather/lighting seed-completion rules, add random sky selection,
+or enable Static Sky/color/individual-celestial pages prematurely.
+
+The dimension-data generator now produces 11 sky/lighting variants from the
+vanilla Overworld baseline. It changes visual skybox/fog/cloud settings only
+in addition to lighting. Geometry, scale, ceiling, monster settings, default
+clock and gameplay attributes are retained; no Nether gameplay or End dragon
+fight is inherited. A derived native day timeline omits only sky/fog/cloud
+color tracks for non-Overworld styles, preserving schedules and illumination.
+Native End/no-sky rendering needs no optional renderer or new artwork. The
+Legacy animated Static Sky renderer cannot be replaced by native flat gray
+without losing its behavior, so its page remains red/unimplemented.
+
+Bright detection includes all registered sky variants, preserving both white
+ambient rendering and the effective brightness floor for surface/Cave Bright.
+Data equality checks confirm all 11 variants preserve geometry/gameplay and
+the day timeline keeps native tracks except the three excluded visual colors.
+Its global time markers remain defined only by minecraft:day, not duplicated
+in the derived timeline. The grouped timeline list is registered as a tag.
+Client appearance and multiplayer travel validation remain manual.
+Registry validation initially caught an invalid inline tag reference and
+duplicate global clock markers in the derived day timeline; both were fixed
+before handoff. The sky diagnostic also now supplies a position when sampling
+the spatial fog attribute. A disposable dedicated server then restored all
+sampled types after restart, including Nether normal/Bright and End normal/
+Cave Bright, with the expected reddish/purple fog at the sample position,
+unchanged geometry/gameplay flags, and effective light 15 on Bright variants.
+Cave Bright End retained its type after unload/reload; a reseeded Nether Age
+retained its style after restart. Servers stopped cleanly and temporary test
+directories/worlds were deleted. These are server/data checks, not a rendered
+client pass. No commit/push/publication is performed.
+
+## Static Sky renderer slice
+
+`1.0.1.71-beta.1` ports the 1.21.1 Legacy-style animated Static Sky, superseding
+the previous unsupported/red status. The six independent 48×48 noise faces
+use the existing default gray tint (146 per channel), noise range 65–224,
+and a two-world-tick refresh. A cached 24-vertex cube and a single 288×48
+dynamic texture use the native textured sky pipeline instead of rebuilding
+thousands of colored cells every frame. No new asset or dependency is needed.
+
+Client-only mixins carry the animation frame in extracted sky state, reset
+it with the state, and own/close GPU resources with SkyRenderer. Static types
+have native skybox NONE; the extracted state alone requests a sky pass and
+the custom renderer replaces it. End flashes and End gameplay are not enabled.
+Normal/Dark/Bright/Cave Bright variants preserve the existing lighting policy,
+geometry and gameplay. Existing persistence handles STATIC as a sky enum value.
+Random sky selection, color pages, and individual celestial bodies remain
+separate unfinished work; this slice does not claim complete sky parity.
+
+Verification: port build passed (no automated unit tests configured). A
+disposable dedicated server created Static Standard Normal and Static Cave
+Bright Ages, confirmed their gray fog, NONE native skybox and correct skylight/
+ambient values, then restored both choices after restart. It stopped cleanly;
+the temporary server/world was deleted. Client animation, travel between sky
+styles, and restart appearance still require manual validation. No user world
+was modified, and nothing was committed, pushed or published.
+
+## Seeded sky completion slice
+
+`1.0.1.72-beta.1` completes missing sky controllers using the first seeded
+selection from 1.21.1 `AgeSkyProfile.random` (`0x534B5950524F464C` salt).
+Inherited and Overworld currently map to the same native Overworld style;
+the effective Overworld/Nether/End/Static weights are 2:1:1:1. This deliberately
+ports only style selection, not random colors or celestial-body lists.
+
+The player book path and `create_random` fixture now share one environment
+record containing weather, lighting and sky. Explicit pages win. Separate
+seed streams keep controllers independent, including when one is supplied
+explicitly, and Cave weather remains Off. Existing Age index values/defaults
+remain authoritative; this does not reroll old Ages or reseeded Age skies.
+The one-purpose controlled fixtures keep their explicit Overworld defaults.
+
+The environment probe checks repeatability and every explicit sky override
+with and without explicit lighting/weather. Manual seeds 0–11 and -1 covered
+all four sky choices, Cave and Void, without changing established weather/
+lighting results; signed-long boundary seeds also passed. Disposable-server
+fixtures created all four random styles plus Bright Static and an explicit
+Overworld override. Static survived unload/reload; Nether retained its saved
+style after reseeding to an End-selecting seed. All six choices survived a
+server restart. The server stopped cleanly and its temporary world was deleted.
+The port build passed (no unit-test sources are configured). Player rendering
+still needs validation of new book creation and travel. No user save is changed
+and nothing is committed or published.
+
+## Shared colors and ambient-light target slice
+
+`1.0.1.73-beta.1` adapts the 1.21.1 `AgeSkyProfile.ColorAccumulator` rules:
+Number 0–24 followed by Red/Green/Blue adds ten times that amount to one
+channel, White adds to all, Black subtracts from all, and final channels are
+clamped. Unnumbered colors use the same seeded index-salt approach. Color
+groups preceding Sky pages, or trailing the book, tint the sky. No colors
+means native rendering; omitted channels within an authored group are zero.
+The new port-only `lighting/ambient_color` target consumes the preceding group
+as ambient color instead. It appears in the existing Lighting creative tab
+and uses the shared procedural glyph/item compositor, not generated artwork.
+
+Profiles are frozen in the Age index with native defaults, retained on reload/
+reseed/retirement rollback, and included in the full catalog. The catalog
+protocol is now 2; both peers need the matching beta. The client replaces its
+profile map before catalog acknowledgment, invalidates the current attribute
+cache and clears the map on disconnect. Age-only default-layer hooks apply
+the native sky/fog/ambient RGB attributes dynamically; vanilla dimensions are
+not changed. No runtime dimension registry mutation or RGB variant explosion
+is involved. Client sky state carries tint separately from the live world:
+Static cells use that tint, and the native End texture uses a color modulator.
+Native celestial rendering is otherwise unchanged; authorable bodies remain
+pending. Explicit ambient tints do not alter the effective Bright floor or
+fabricate block/sky light; native lightmap tinting controls their appearance.
+
+Numbers are supported only before shared colors in this slice. Celestial
+numeric modifiers and variable Static resolution (#109) remain unsupported.
+Random sky color completion and deprecated legacy fixed-color aliases remain
+pending; this is not a claim of full celestial/color parity. Rendering needs
+manual checks of authored groups, all sky types, ambient color, no leakage on
+travel/reconnect, and persistence. Dedicated-server fixtures exercise known
+RGB results, zero/upper amounts, clamping, seeded repeatability, rejection of
+dangling numbers, and a catalog encode/decode round trip. All four colored
+styles and an uncolored native fixture restored correctly after restart with
+the expected sampled RGB attributes. The server stopped cleanly and its
+temporary world was deleted. Port build/static checks passed; there are no
+unit-test sources configured. Client rendering and live multiplayer sync
+remain manual checks. No commit, push, or publication was requested.
+
+## Authored native day-cycle slice
+
+`1.0.1.74-beta.1` ports Normal Time with Full/Half/Double/Zero Length modifiers,
+using the fixed values from the 1.21.1 symbol definitions. Number pages before
+Length apply the existing `CelestialPageValues` rule (`number × 0.08` days).
+Zero chooses a seeded time once and saves it. Missing Normal Time retains the
+native cycle. The strict interim grammar requires at most one Length preceding
+one Normal Time; broader ordered recovery and multiple celestial bodies remain
+separate work. Number targets other than colors and lengths are still unported.
+
+The Age index persists a native-default day-cycle profile. Lifecycle load,
+reseed, retirement/rollback and catalog sync include it. Catalog protocol 3
+carries the new profile map; clients replace it before acknowledgment, clear it
+on logout and invalidate current attributes/sky brightness. Both peers need
+the same beta build. A small Age-only Builder mixin preserves native dynamic
+timeline ordering and weather layers, but supplies a read-only wrapped clock
+manager for this Age's timeline samples. Its clock instances are cached per
+definition, read profiles lazily (including during level construction), and
+delegate non-Overworld clocks untouched. No global clock mutation occurs.
+
+Native day shading, sun/moon tracks, moon phase, and gameplay attributes in
+those timelines share the scaled sample. Zero has a constant integer sample,
+rate zero, and partial tick zero, preventing the prior stopped-time bounce.
+This does not accelerate blocks/entities, change the native `/time query`
+result, make a Nether/End/Static sky show bodies, or port custom bodies. Global
+time commands still affect moving samples. Authored RGB overrides and existing
+Bright/Dark behavior remain independent. Separate Sun/Moon, angle/phase/size/
+direction, eclipses, and randomized celestial completion are still pending.
+
+Fixtures validate parser eligibility, known half/double/zero clock values,
+Number overrides, deterministic stopped time, and the shared catalog codec.
+At shared native time 18022 the sampled Full time was 18022 (sky light 4),
+Half 36044 (sky light ~13.92), Double 9011 (sky light 15), and Zero stayed at
+11611 with its unchanged sun angle. An unmodified Age matched Full exactly.
+Zero survived unload/reload and reseeding without rerolling; the color fixture
+retained its RGB values. All authored profiles, numeric endpoints 1/24, zero
+override, native fallback, and the color fixture restored after server restart.
+The final port build passed (no unit-test sources configured). Test servers
+stopped cleanly; their temporary world was deleted. Visual/client reconnect
+checks remain manual. No commit/push/publication is performed without an
+explicit request.
+
+## Native cycle phase and direction slice
+
+`1.0.1.75-beta.1` extends the existing day-cycle profile with a saved native
+clock origin, phase offset and direction. Phase conversion is adapted directly
+from 1.21.1 `AgeDimensionService.applyInitialCelestialPhase`: the symbolic
+angle is measured from Nadir, then shifted 18000 native ticks. Rising/Zenith/
+Setting/Nadir give 0/6000/12000/18000, and preceding Number pages override a
+Phase using the `CelestialPageValues` 15-degree rule (24 wraps to 0). Length
+and phase remain independent. Explicit phase starts at Age creation, not at
+the current Overworld position divided by Length.
+
+Moving samples are `direction * (nativeTicks - origin) / period + phase`;
+Counterclockwise reverses the native day timelines, including moon-phase and
+gameplay tracks. Stopped samples remain constant and prefer written phase,
+otherwise the previous saved seeded stopping time. Existing profiles without
+the new optional fields retain their former behavior. Saved/profile lifecycle
+and catalog synchronization already carry the extended codec. Catalog protocol
+4 requires matching client/server beta versions. No registry types, textures,
+or global clock mutations are added. Angle/size/per-body color and multiple
+celestial rendering remain pending, as do eclipses and random celestial
+completion. #110's Time/Normal Length naming changes remain separate work.
+
+The interim grammar accepts at most one Length, Phase and Direction preceding
+one Normal Time; numbers currently target Color/Length/Phase only. Fixtures
+check all phase mappings at a shared origin, forward/reverse deltas, stopped
+behavior, parsing of the earlier three-field profile, and full catalog codec
+round trips. At native tick 1518, profiles sharing origin 496 and noon offset
+sampled 7022 forward and 4978 backward, with sun angles ~10.756° and ~349.244°.
+Zero Zenith stayed at 6000 / 0° / sky light 15; Zero Nadir stayed at 18000 /
+180° / sky light 4. Number 6 yielded sunrise; Number 24 yielded midnight.
+The reverse profile survived unload/reload; reseeding retained frozen midnight.
+All sampled profiles restored after a server restart, retaining their origins,
+direction and fixed phases; the old-style seeded Zero fixture also retained
+its saved stopping time. Build checks passed (no unit-test sources configured).
+The test server stopped cleanly and its temporary world was deleted. Rendered
+motion and reconnect behavior remain manual. No commit/push/publication is
+performed without explicit direction.
+
+## Native orbital bearing slice
+
+`1.0.1.76-beta.1` ports the four Angle pages and the existing 1.21.1
+`CelestialPageValues` number rule (15° per number, modulo 360). North/East/
+South/West map to 0/90/180/270. The interim grammar accepts one Angle before
+Normal Time, independent of Length, Phase and Direction. Missing Angle keeps
+the native orientation rather than enabling random-bearing completion.
+
+The cycle codec adds an optional bearing defaulting to -1 (native). Existing
+origin/phase/direction defaults and lifecycle persistence remain unchanged.
+Catalog protocol 5 carries the extended profile; older peers must update.
+Extracted sky state carries/resets bearing. Native SkyRenderer's Y rotation
+for the shared sun/moon/star path uses the explicit value; the sunrise/sunset
+pose receives the corresponding delta from the native -90° body bearing, with
+balanced pose-stack restoration. No live-world lookup occurs during drawing.
+Colors, native geometry/textures, phase timing, illumination, and direction
+are retained. Angle changes only horizontal orientation, not altitude. Body
+counts/sizes/colors and eclipses remain pending; no extra rendering backend,
+asset or registry variant is introduced. #110 is deliberately not implemented
+as part of this port slice.
+
+The port build passes (no unit-test sources configured), and the targeted
+PoseStack invocation signature was checked against the patched native class.
+Disposable-server fixtures exercise cardinal values, all 0–24 Number values,
+six-field profile fallback, and the complete catalog stream codec. All four
+frozen-sunrise fixtures sampled the same time 0 and sky light ~14.19; only
+their saved bearings differ. Number 3 gave 45°, Number 24 gave 0°. Unwritten
+bearing retained -1. East survived unload/reload; the 45° profile retained its
+bearing after reseed. Client rendering/glow alignment and travel isolation
+still require manual validation; server probes cannot prove the drawn result.
+All six explicit bearings and the native fallback restored correctly after
+restart. The test server stopped cleanly and its temporary world was deleted.
+No commit/push/publication is performed without an explicit request.
+
+## Celestial-compatible missing-Sky fallback
+
+`1.0.1.77-beta.1` restricts the missing-Sky fallback for celestial writing to
+the current renderer's compatible style, Overworld. Normal Time no longer
+inherits an unsuitable seeded Nether/End/Static background. The resolver
+also recognizes Sun/Moon intentions for future support without enabling
+those pages prematurely. Explicit Sky pages always win; no-celestial random
+selection, terrain, and independent weather/lighting streams are unchanged.
+No packet or saved-profile format changes are needed. Existing Ages retain
+their saved style; tests of the fix must create new Ages.
+
+1.21.1 comparison: `AgeSkyProfile.compile` starts with inherited sky style;
+the bundled Age profiles all use the Overworld dimension type. Authored Sun/
+Moon selects `AgeEnvironmentCompiler.CUSTOM_SKY_EFFECTS`, whose renderer draws
+the body list after its background without a sky-style exclusion. Thus the
+bundled 1.21.1 paths already avoid this visibility regression, and no follow-up
+issue or root-code change is needed for them. This is not a claim about every
+possible third-party datapack profile.
+
+The environment diagnostic checks missing/explicit Sky for Normal Time, Sun,
+and Moon, including both explicit-page orders, and verifies other environment
+choices are unchanged. The day-cycle fixture now supplies no Sky page and
+uses the same environment resolver as player books. Client creation/travel
+checks remain manual. Build and disposable-server creation checks passed:
+Normal Time without Sky selected native Overworld for seeds 0, 6 and 8,
+while the same seeds without celestials retained Nether, Static and End.
+Explicit-Sky precedence and independent environment choices passed the
+diagnostic checks, including Cave terrain. The server stopped cleanly and
+its temporary world was deleted. No commit/push/publication is performed
+without an explicit request.
+
+## Normal Time sun size
+
+`1.0.1.78-beta.1` ports Small/Normal/Large Celestial Size modifiers to the
+native Normal Time sun. Presets are 0.5×/1×/2×. An immediately preceding Number
+uses the root compiler's `0.25 + number * (2.75 / 24)` rule, covering 0.25×
+through 3×. Root Normal Time creates a size-modified sun and a 1× moon; this
+slice preserves that distinction rather than resizing both. Standalone Sun/
+Moon controllers, multiple bodies, per-body colors and eclipses remain pending.
+No random size completion is added yet.
+
+`PortDayCycle` persists optional `sun_size`, defaults old profiles to 1×,
+validates the supported range and transmits it in catalog protocol 6. Size
+is extracted into the sky render state and multiplies only the native sun
+transform. Native texture/glow and rendering pipeline remain; no new assets
+or buffers are allocated. State resets/defaults prevent size leaking to other
+dimensions. Clock sampling, illumination and orbit bearing are unaffected.
+
+The `create_size` op fixture freezes the sun at Zenith with Zero Length and
+omits Sky to exercise compatible completion. Diagnostic checks cover all
+25 numeric sizes, presets, older profile defaults, unchanged timing and
+catalog round trips. Disposable dedicated-server checks produced sizes
+0.5/1/2/0.25/1.625/3 with the same noon angle and sky light; reload, reseed
+and full restart retained them. Build passed. Visual size/glow alignment,
+unchanged moon, and travel isolation still require the user's client check.
+The server stopped cleanly and its temporary world was deleted. Nothing is
+committed, pushed or published without an explicit request.
+
+## Normal Time shared celestial color
+
+`1.0.1.79-beta.1` ports the root `AgeSkyProfile` behavior that consumes a
+pending shared color group at Normal Time and applies it to both paired
+bodies. `PortAgeColors` now saves an optional `celestial` RGB value, default
+-1 (native/untinted), with catalog protocol 7 for synchronization. Existing
+sky/ambient fields and old profiles retain their values. Color accumulation
+passes through non-color celestial modifiers, clamps at the target, resets
+after consumption, and leaves trailing colors assigned to sky as before.
+
+Extraction copies the saved tint into `SkyRenderState`. A narrowly scoped
+native sun/moon uniform modification multiplies RGB while retaining alpha;
+there are no live world reads during drawing, new textures, pipelines or GPU
+buffers. Native weather fading, transparent halos, moon phases, stars and
+sunrise glow remain unchanged. Time and effective illumination are not tied
+to RGB. State reset/defaults prevent cross-dimension tint leakage. Independent
+Sun/Moon pages, multiple bodies and per-body colors remain unported.
+
+The `create_celestial_color` fixture checks three separate target groups,
+completed-group clamping, modifier passthrough, consumed-group reset, seeded
+unnumbered colors, old codec defaults and catalog round trips. Client checks
+must cover a frozen Zenith sun, Nadir moon, mixed colors, transparent halos,
+restart and return to an untinted dimension. Server probes validate saved
+profiles and attributes, not rendered output. Build passed; disposable-server
+fixtures retained separate sky/ambient/body colors through reload, reseed and
+restart, including zero/black colors and untouched native defaults. Sampled
+time/light remained unchanged. The server stopped cleanly and its temporary
+world was deleted. No commit/push/publication is performed without an explicit
+request.
+
+## Standalone Sun and Moon controllers
+
+`1.0.1.80-beta.1` extends the existing cycle profile with optional `body_mode`
+(paired=0, Sun=1, Moon=2); old profiles default to the paired renderer.
+Catalog protocol 8 includes this field. One celestial controller is accepted
+per book, with existing Length/Phase/Direction/Angle/Size and shared Color
+groups. Multiple controllers and dangling/duplicate modifiers retain the
+interim strict rejection rather than losing written pages.
+
+Standalone bodies use a linear angular orbit as in root `AgeSkyProfile.Body`.
+Both native body-angle attributes point at that orbit; render-state mode
+suppresses the absent counterpart. The selected Moon consumes Size itself;
+Normal Time retains its original sun-only sizing. Moon-only sunrise glow is
+suppressed before any horizon pose is pushed. Shared RGB/alpha handling and
+native buffers/pipelines are reused, with extraction/reset defaults protecting
+other dimensions. Missing Sky completion uses Overworld, as before. Explicit
+Nether/End/Static still does not draw bodies in this native-renderer slice.
+
+The gameplay skylight attribute follows root `lightAt` and
+`LevelSkyBrightnessMixin`: positive cosine altitude, 0.18 for a moon, weather
+attenuation, then the 11-level sky-darkening range. It does not infer light
+from color or size, and does not bypass Bright/Dark or no-skylight terrain.
+Native background/star/moon-phase schedules remain, rather than claiming a
+full custom sky port. Seeded default phase/bearing completion, multiple
+independent bodies and eclipses remain future work.
+
+The op `create_body` fixture checks all named phases for both bodies, light
+weights, numeric size, reverse motion, order rejection, old-profile defaults,
+compatible missing Sky and catalog synchronization. Actual body visibility,
+moon size, glow transparency and travel isolation require manual client
+validation. Build and disposable-server probes passed: Zenith sun/moon
+skylight was 15/6, Nadir and horizon were 4; named phase angles were correct.
+The paired fixture retained its opposite moon and native lighting. Reload,
+reseed and full restart preserved body mode, color, size, bearing and phase.
+The test server stopped and its temporary world was deleted. No commit/push/
+publication is performed without an explicit request.
+
+## Multiple independent authored celestials
+
+`1.0.1.81-beta.1` adds an optional immutable `PortCelestialBody` list to the
+cycle profile and catalog protocol 9. Existing profiles default to an empty
+list and use their validated native paired/single path. Books with multiple
+controllers compile ordered modifier groups into independent body orbits;
+Normal Time expands into opposite-phase sun/moon entries. Colors are consumed
+at each controller, with original page indices retained for seeded amounts.
+Uncolored bodies reset to native white rather than inheriting the previous
+body's tint. Size/phase/length/bearing/direction also reset per group.
+
+The profile constructor and authoring gate enforce the root ten-sun/ten-moon
+limit, with Normal Time counting toward both. Duplicate modifiers within a
+group and dangling modifiers remain strict errors until grammar recovery is
+ported. The first controller continues to govern the shared day timeline and
+native background/star/moon-phase schedules. Positive-altitude sunlight sums
+to at most 1; only if no sunlight contributes is summed 0.18-weight moonlight
+used. Weather and Bright/Dark remain separate. No eclipse attenuation is
+included yet.
+
+Extraction resolves body angles into immutable presentation snapshots. The
+native body pass is replaced only for a nonempty multi-body list: draw suns
+first, then moons with their own color, size and bearing, then native stars
+once. Native buffers, pipelines and alpha are reused. Temporary renderer
+parameters and pose transforms restore in finally blocks; no world lookup is
+performed during drawing. Explicit Nether/End/Static rendering remains a
+separate limitation. Eclipse disc occlusion, corona and sky/light attenuation
+will be the following slice, not a claim of this implementation.
+
+`create_celestials` checks independent motion/color/size, modifier reset, Normal
+Time expansion, ten-pair acceptance/overflow rejection, profile codecs and
+catalog round trips. Manual checks cover body placement/alpha, multiple
+controllers, restart and ordinary-dimension isolation. Build passed, as did
+disposable-server profile/catalog checks, combined-light invariants, reload,
+reseed and full restart. Single-body, paired and tinted fixtures retained
+their earlier behavior. The test server stopped and its temporary world was
+deleted. No commit/push/release is performed without explicit instruction.
+
+## Eclipse effects
+
+`1.0.1.82-beta.1` adapts root `AgeSkyProfile.eclipseFor`, `eclipseAt` and
+`lightAt`, plus `RivencraftSkyEffects.drawBody`. The dot-product separation
+of normalized orbit directions is compared with the sum of quarter-disc
+angular radii; each body takes the strongest opposite-kind contact. This is
+root's radial proximity formula, not a new physical disc-area model. Bearing,
+phase, size, motion and direction all affect contact. Same-kind and isolated
+bodies have no eclipse; only an above-horizon sun contributes global shading.
+
+Sunlight is multiplied by `1 - 0.85 * overlap` before the existing light
+aggregation and weather handling. Extraction shades sky RGB by
+`1 - 0.65 * strongestVisibleSolarOverlap`. Moon RGB scales by `1 - overlap`;
+sun RGB moves toward white by `pow(overlap, 8) * 0.8`. Values are derived from
+saved profiles, requiring neither a new saved schema nor packet fields.
+Existing multi-body Ages gain the effects on update; single/paired native
+paths stay unchanged. Overlap calculations are bounded by the 20-body limit,
+and extracted presentation values are reused without live-world drawing reads.
+
+Native transparent glows draw before each body's central ordinary-alpha disc.
+A registered pipeline cloned from native Celestial uses conventional alpha
+blending; cached center-cropped atlas meshes retain native UV orientation.
+An eclipsed moon uses the full-moon core to avoid transparent phase pixels
+exposing the sun (root always drew that full-moon center). Weather alpha is
+retained. The helper drops meshes on atlas-generation change and closes them
+with the renderer. There is no generated art or per-frame mesh allocation.
+Explicit Nether/End/Static body rendering remains outside this slice.
+
+`create_eclipse` supplies aligned, partial, clear, below-horizon and moving
+fixtures; it checks overlap/color/light constants, same-kind exclusion and
+motion out of contact. The multi-body op fixture is renamed
+`create_celestials` to avoid merging with the unrelated existing terrain
+`create_multi` command. Manual checks must confirm disc opacity, halo,
+corona/sky darkening, resource reload and travel isolation. Build passed.
+Disposable-server fixtures passed with overlap 1/0.293/0 for aligned/partial/
+clear cases and no global shading for below-horizon alignment. Aligned
+sunlight was 0.15, clear sunlight 1; sampled skylight was 6/12/15 for aligned/
+partial/clear. Moving contact ended as expected. Reload, reseed, catalog
+round trips and full restart retained profiles and derived light behavior;
+earlier standalone/paired fixtures remained unchanged. The test server stopped
+and its temporary world was deleted. No commit/push/publication is performed
+without an explicit request.
+
+## Authored moon sprite correction
+
+`1.0.1.83-beta.1` removes the mixed native-phase/full-core adaptation introduced
+with the opaque eclipse pass. Standalone and multi-body authored moons now
+draw full-moon glow and center consistently, matching root's custom renderer,
+which always samples the first (full-moon) atlas cell. Under ordinary alpha,
+native dark phase pixels can produce black opaque centers; the old overlay
+glow had made those dark pixels effectively invisible. The ordinary native
+Normal Time pair retains its calendar phases. No eclipse math, saved profile,
+catalog protocol or world data changes are needed.
+
+The user's `celest` Age was read without modification. Its body colors are
+all -1 (native white), not corrupted black values. Its first Moon and second
+Sun both have period 1, phase 0, origin 0, clockwise direction and native
+bearing -1; they remain exactly coincident. That moon's full eclipse and its
+occlusion of the sun are expected under the newly added root overlap rules,
+independent of the phase-sprite correction. Do not silently alter player-authored
+orbits to conceal the intentional alignment. Manual checks cover nonaligned
+moons, the known permanent eclipse, Native Normal Time, resource reload and
+cross-dimension isolation. No user save was modified, and nothing is committed,
+pushed or published without explicit instruction.
+
+## Celestials over explicit non-Overworld skies
+
+`1.0.1.84-beta.1` removes the presentation exclusion that hid authored bodies
+over Nether/End/Static. Root `RivencraftSkyEffects` draws its body list after
+any chosen background. The native 26.3 paths instead returned after End or
+skipped a NONE sky entirely. An extracted overlay-mode flag now schedules an
+authored body layer without changing the actual dimension type or gameplay.
+Single Sun/Moon and Normal Time profiles expand into temporary presentation
+bodies on these backgrounds; saved profiles are not rewritten. Existing
+Overworld single/paired/multi-body paths stay unchanged.
+
+End uses a RETURN hook that includes the native early return, after its pass
+is closed. Static closes its own background pass before drawing the overlay.
+Fog-only Nether presentation schedules an extracted END sky pass, suppresses
+its End background/flash drawing, and retains the fog clear color. Overlay
+passes load existing targets without clearing, reuse native body resources
+and suppress additional stars/horizon glow on non-Overworld backgrounds.
+Weather alpha is extracted even when the native NONE/END branch omits it.
+All presentation flags reset when the render state is reused.
+
+Eclipse shading modulates End/Static background tint; Nether-style fog color
+uses the same root shade factor through an environment attribute layer.
+Native untinted fog and authored sky colors are both supported; other
+backgrounds retain their existing fog behavior. Body lighting and eclipse
+geometry do not depend on style. Missing Sky selection still chooses
+Overworld for authored celestials. No schema/protocol changes or new assets
+are required. The eclipse fixture accepts an optional explicit Sky; server
+checks cover saved choices, fog/light behavior and persistence, while visual
+layering, no duplication, resource reload and travel isolation require manual
+client checks. Build and disposable-server checks passed for all four sky
+styles: aligned eclipse skylight stayed 6, clear stayed 15, and Nether fog
+scaled by 0.35 only during overlap. No-celestial and tinted-Nether fixtures
+retained their expected colors. Saved profiles, style, light and fog survived
+reload/reseed and full restart. The test server stopped and its temporary
+world was deleted. No commit/push/publication is performed without explicit
+request.
+
+## Bare celestial seeded randomization
+
+`1.0.1.85-beta.1` adds per-controller randomization specifically for bare
+Sun/Moon groups, as requested for easier testing. This deliberately uses the
+root **random-Age** ranges rather than its authored compile defaults (which
+reuse shared seeded phase/bearing and default size/color). A dedicated stream
+mixes Age seed with controller ordinal, independent of unrelated page indices,
+terrain/weather/lighting RNG and sky selection. Palette/mixing and 0.75–1.75
+size come from `AgeSkyProfile.random`; 0.2–2 periods with 1/7 stopped chance
+come from `AgeTraits.select`. Bearing and phase use the port's existing degree/
+tick granularity. Direction is random per body. Counts and body-kind limits
+still follow explicitly written controller pages.
+
+The compiler recognizes whether a controller has any written celestial
+modifier. Colors already consumed by Sky/Ambient do not suppress randomization.
+Any written celestial modifier retains the previous authored path as a whole,
+not just individual field overrides; partially authored groups do not gain
+new random missing fields in this slice. Normal Time and absent controllers
+are unchanged. Bare controllers materialize immutable full body profiles,
+including a one-body list for standalone cases. Multi-body compilation carries
+their colors/orbits without replacing them with native defaults. No new
+saved schema, protocol or client renderer code is needed.
+
+Only newly created Ages compile these defaults. Older saved profiles load
+unchanged; GUI opening, restart and terrain reseeding do not reroll them.
+`create_random_celestials` checks reproducibility, ordinal independence,
+unrelated-page stability, 128-seed bounds/pool coverage and unchanged authored/
+Normal Time behavior. The regular fixtures still exercise explicit groups.
+Manual checks cover visible variation, moving/stopped bodies, mixed authored
+groups and restart. Build and disposable-server checks passed, including
+single bare bodies, multi-body/128-seed coverage, catalog round trips,
+unrelated-page stability, explicit/eclipsed fixtures, reload, terrain reseed
+and full restart. Saved random parameters remained unchanged while moving
+orbits continued with the clock. The server stopped and its temporary world
+was deleted. No commit/push/publication occurs without explicit request.
+
+## Missing celestial branch completion
+
+`1.0.1.86-beta.1` adds creation-only `PortDayCycle.resolve`. Written controllers
+delegate to the validated compiler unchanged. If none exist, the root
+`AgeSkyProfile.random` draw positions select 0–3 suns and 0–3 moons: consume
+the sky-style draw and mixed sky-color draws, then the two counts. Body
+settings reuse .85's independent per-controller streams. This matches root's
+unrestricted count model, not bit-identical per-body values; the .85 per-body
+length/direction independence is retained. Missing sky tint completion and
+random-page policy parity are not claimed by this slice.
+
+The shared resolver is used by player book creation and the `create_random`
+operator command. Other exact diagnostic fixtures continue using `compile`
+or native profiles to isolate their subject. A saved NONE body mode (3)
+represents a resolved zero-body sky. Its sun/moon/horizon drawing is suppressed
+without switching to Dark lighting or changing the native background/star
+timeline. Old missing profiles still decode to NATIVE rather than being
+retroactively completed. The mode-domain extension uses catalog protocol 10.
+No generation runs or rerolls happen during GUI rendering, load or reseed.
+
+`create_completed_sky` tests 256-seed count bounds and coverage of empty,
+sun-only, moon-only and mixed results; reproducibility and unrelated-page
+stability; explicit-controller precedence; old defaults; and catalog round
+trips. Manual checks cover varied new books, empty skies, explicit-controller
+counts, all backgrounds, restart and Overworld isolation. No commit/push/
+publication is performed without explicit instruction.
+
+The .86 build and disposable dedicated-server checks passed: four background
+fixtures, the seed-14 empty sky, random Age creation, explicit controllers,
+catalog round trips, unload/reload, terrain reseeding and full restart. Saved
+body parameters survived unchanged. The test server was stopped and its world
+deleted; client visual confirmation remains a manual check.
+
+## Random Age sky-color completion
+
+`1.0.1.87-beta.1` uses creation-only `PortAgeColors.resolve` for player books
+and `age create_random`. Empty symbol lists choose a sky tint from root
+`AgeSkyProfile.random`'s palette and draw order, including its rounded channel
+averages. Nonempty symbol lists delegate to the existing compiler unchanged.
+This intentionally distinguishes wholly random Ages from authored books with
+an omitted sky-color branch, as 1.21.1 does. The existing .85 per-body random
+color truncation is preserved by a shared palette helper; celestial count and
+body random streams do not change.
+
+Colors are stored in the existing profile and catalog fields. Old native
+colors are not retroactively randomized; reload, restart and terrain reseed
+do not rerun completion. No protocol update is necessary. The completed-sky
+diagnostic checks six root seed/color vectors, codec persistence, authored
+precedence (including explicit black) and old-profile defaults. Random-page
+blocklist parity remains separate pending work.
+
+Build and disposable dedicated-server checks passed: root vectors and authored
+precedence, color attributes/catalog round trips for all four background
+styles, explicit sky/ambient colors, unload/reload, reseed and full restart.
+Saved random colors stayed unchanged after reseeding and restart. The test
+server was stopped and its disposable world deleted. Client rendering is
+still a manual check. No commit, push or publication was performed.
+
+## Authored biome branch completion
+
+`1.0.1.88-beta.1` ports the explicit-controller missing-pool behavior from
+1.21.1 `AgeBiomeSelection.compile`: Single requires one biome; other nonnative
+controllers require two distinct biomes. An entirely omitted pool uses the
+seeded 2:1 continuation/stop draw up to the eligible pool size. Authored pools
+fill only to the minimum, preserve order and duplicate weights, and never add
+an unrequested third biome once the minimum is met. Native still disallows
+biome pages. The binder's availability validation accepts incomplete pools;
+the server resolves actual registry eligibility before creating the Age.
+
+Player creation now passes the actual Age seed to biome compilation. Exact
+older diagnostics retain the registry-only compiler; the new completion
+fixture exercises the production seeded path. Cave uses recognized Cave and
+Nether biomes. Void does not inject The Void alongside authored biomes and
+reports a clear distinct-biome error when completion is impossible. Pools
+are stored in existing `PortBiomePlan` fields and never rerolled on restart
+or terrain reseed. No protocol change is needed. Broader writing recovery,
+structure-driven missing-biome selection and random-page policies remain
+separate parity work.
+
+The build and disposable dedicated-server checks passed. The completion
+fixture checked every distribution over 32 seeds, partial/full/weighted pools
+and codec round trips. Created Standard Single, Flat Tiny, Cave Tiny and Void
+Single plans; Cave included the new 26.3 Sulfur Caves biome. An impossible
+controller-only Void Tiny pool was refused with the distinct-biome message.
+Generator pools survived unload/reload, reseed and full server restart.
+The server was stopped and the temporary world deleted. Binder interaction
+and in-game biome layouts still require manual validation. No commit, push
+or publication was performed.
+
+## Unpaired material completion
+
+`1.0.1.89-beta.1` adapts 1.21.1 `AgeFeatureSelection.implied`. A shared pure
+normalizer expands an unpaired material into an internal material/feature
+pair, keyed by Age seed, material ID and its original book index. Rock, lake
+and terrain-feature compilers all use the same completed view. Original book
+pages stay unchanged and no random selection happens at render/load time.
+Explicit feature targets suppress completion, including incompatible targets
+that must still be rejected by the current strict grammar.
+
+Candidate ordering and terrain restrictions follow root's material-feature
+list: Rocks/Floating Islands/Tendrils/Spheres/Spikes/Obelisks for solids and
+the three lake types for fluids, filtered by supported terrain. Cave only
+permits the two terrain-independent solid features; Void also permits floating
+islands; Flat excludes Rocks. No fallback fluid feature exists on Flat, Cave
+or Void. This does not add page-free random features, nor remove the existing
+per-feature caps or introduce instability recovery. Resulting plans use their
+existing save codecs, so no catalog/protocol change is needed.
+
+The operator fixture checks 64 seeds on each terrain: independent consecutive
+materials, deterministic/idempotent completion, explicit precedence, candidate
+coverage, fluid retention and incompatible-fluid rejection. Persistence and
+actual generator plans are inspected with `feature_plan` without generating
+chunks. Client binder interaction and feature visibility remain manual checks.
+
+The .89 build and disposable server checks passed: seeded fixture assertions,
+Standard Glowstone Spikes, Cave Diamond Spheres, Void Stone Tendrils, Flat
+Glowstone Obelisks and Standard Water Deep Lakes. Cave Water was refused.
+Feature plans and materials survived unload/reload, terrain reseed and full
+restart. The server was stopped and its temporary world deleted. No commit,
+push or publication was performed.
+
+## Page-free random material features
+
+`1.0.1.90-beta.1` adapts the material and rare-formation portion of 1.21.1
+`AgeFeatureSelection.randomChoices`. A new creation-only selector shares the
+production authored plan compilers rather than duplicating generator logic.
+It rolls 0–2 unique material feature types, uses root's candidate ordering and
+Legacy rank chooser, removes chosen types, and selects full-collision solids
+or source fluids from the registered sorted pools. Terrain eligibility uses
+the current port validator. The separate seeded Skylands and Star Fissure
+rolls and the 1-in-10 Crystal Formations roll follow root's rules.
+
+Player Link-Panel-only creation and `age create_random` share this selector.
+Authored books still use their own feature compilers, including implied
+materials from .89. Plans are frozen in existing save fields, without extra
+book pages or a protocol change. Old Ages keep their original plans.
+Random structures, random-page policies and instability are not claimed by
+this slice. Material values can be valuable/hazardous, matching the root pool;
+the instability port must account for that before stable release.
+
+`create_random_features` checks 64 seeds across all terrain types: seeded
+determinism, counts 0/1/2, unique feature types, all nine candidate families,
+terrain compatibility, rare-feature coverage, and plan codec round trips.
+`feature_plan` treats an absent feature generator as a valid empty result.
+Client feature visibility remains a manual check.
+
+The .90 build and disposable server checks passed. The seeded matrix covered
+all six terrains and all nine material feature families. Created surface,
+Cave, Flat and Void fixtures, including lakes, rare Skylands and a Star
+Fissure, and verified the production `create_random` plan. Seed 0 Standard
+correctly produced no features; seed 1 produced a single lake. Saved plans
+survived unload/reload, reseed and full restart. The server was stopped and
+its temporary world deleted. Nothing was committed, pushed or published.
+
+## Page-free random structures
+
+`1.0.1.91-beta.1` ports `AgeStructureSelection.randomChoices`: an independent
+seed stream rolls 0–2 unique candidates using Legacy ranks. Terrain and
+registry availability are checked, then the selected biome pool must intersect
+the structure set's normal biome eligibility. This is deliberately stricter
+than authored pages, which retain their existing biome overrides. Native
+Flat uses Plains, Native Cave uses the backend's Lush Caves fallback, and
+other native noise terrain uses the Overworld LevelStem biome source. A
+non-Native plan uses its saved biome IDs. Abandoned Camps are added after
+the root candidate list at rank 3. Cave Dungeons remain excluded by current
+port support, whereas root permits that combination; it needs a separate
+placement validation before enabling it.
+
+The combined random feature resolver preserves .90 material/rare choices,
+adds Dungeons separately, and merges structure pages into the saved terrain
+feature plan. A new optional `structure_control` field defaults false for
+old profiles and is true for new random Ages, even for an empty selection.
+The generator applies its existing controlled-set filter when that flag is
+true. This prevents zero choices from accidentally retaining all vanilla
+controlled sets. Other native structure families still use their normal
+biome gate. Existing authored/old plans are not rewritten, and no catalog
+protocol change is needed.
+
+The operator fixture checks seeded counts/uniqueness, all terrains, fixed
+Plains/End/Nether biome pools, native defaults, biome eligibility, the empty
+controlled-set gate, explicit Village precedence, merge/codec persistence,
+and old-profile defaults. Actual placement remains an in-game check.
+
+The .91 build and disposable server checks passed. Fixtures exercised Plains,
+Native Flat, Nether-biome Cave, End-biome surface and empty Void selection,
+plus the production random-Age command. Village, Fortress and Dungeon plans,
+and an intentionally empty controlled plan, survived unload/reload, reseed
+and full restart. Namespaced biome arguments were checked. The server was
+stopped and its temporary world deleted. No commit, push or publication was
+performed; generated structure placement remains a manual client check.
+
+## Cave Dungeon parity
+
+`1.0.1.92-beta.1` closes the Cave Dungeon terrain exclusion documented in .91.
+Root `AgeStructureSelection.error` permits Dungeons on noise terrain, which
+includes Cave. The 26.3 feature and placement implementation were already in
+place; the port's shared lake/dungeon Cave rejection blocked authoring and,
+through the availability check, random selection. Splitting that validation
+permits Cave Dungeons without allowing Cave lakes or Flat/Void Dungeons.
+
+The two targets' `worldgen/placed_feature/dungeons.json` files compare exactly:
+vanilla monster_room, count 8, in-square and full-height uniform placement
+using above-bottom/below-top anchors. No legacy Y=0 assumption is introduced.
+Vanilla's solid floor/ceiling and opening-count requirements still determine
+successful placement. The 32-page cap and per-occurrence deterministic seed
+remain unchanged. New random Cave Ages now consider Dungeons automatically;
+old frozen plans are not changed.
+
+The extended `create_dungeons` fixture checks Cave stacking/cap and the
+remaining lake/Flat/Void restrictions. The random-structure matrix now requires
+Cave Dungeon coverage. `dungeons_probe` accepts an optional 1–4 chunk-side
+bound for manual tests; it is not run automatically, avoiding a large sync
+chunk-generation scan. Actual dungeon placement is handed to the client check.
+
+The .92 build and disposable server checks passed: Cave and surface authored
+fixtures, 32-page stacking/overflow, retained lake and Flat/Void rejection,
+and random-structure coverage including a Nether Cave Dungeon selection.
+Dungeon counts survived unload/reload and full restart; frozen random plans
+survived reseed. Placement JSON matched the 1.21.1 file byte-for-byte. The
+server was stopped and its temporary world deleted. No commit, push or
+publication was performed. No dungeon chunk scan was run automatically.
+
+## Biome-specific Nether and End materials
+
+`1.0.1.93-beta.1` ports root `AgeDimensionService.withBiomeMaterialRules`.
+The backend was using `caves.materialRule()` unchanged, which selects
+`minecraft:overworld_caves` and can apply Overworld grass to Nether biomes.
+The new noise-settings wrapper sequences the five vanilla End biomes' registered
+End rule, then the five vanilla Nether biomes' registered Nether rule, then
+the original terrain rule. This fixes Cave Nether coverings and the equivalent
+End/Nether mismatch in authored Standard, Amplified and Island noise Ages.
+It uses the active rule registry rather than copying vanilla material tables.
+
+All non-material settings are preserved. Dry Cave's AIR default fluid, empty
+aquifer config and minimum-relative sea level remain intact. Native Nether
+surface rules can still place their own lava patches; this does not restore
+flooded Cave aquifers. Flat/Void layer materials and custom feature materials
+are not rewritten. Old saved Ages pick up the rule when reloaded, but only
+newly generated chunks change; no generated blocks are retroactively edited.
+No profile field or network protocol change is required.
+
+The creation fixture verifies unchanged geometry/router/default blocks and
+fluids, aquifers and sea level for four noise presets, and round-trips the
+composed material rule with registry-aware codecs. `material_probe` limits
+generation to one terrain-stage chunk and reports actual block counts.
+
+Build, registry-aware rule codec tests and disposable server terrain checks
+passed. All five Nether Cave fixtures generated their native material families
+without grass/dirt: Nylium, Soul Sand/Soil, Basalt/Blackstone or Netherrack.
+Standard The End and Island End Highlands generated End Stone; Lush Cave's
+original Overworld materials remained present. Reload retained the rules, and
+fresh chunks after full restart again used Nylium/End Stone. No full feature
+or entity chunk scans were run. The server was stopped and temporary world
+deleted. Nothing was committed, pushed or published.
+
 ## Verification of this first slice
 
 The 1.21.1 `compileJava` and `build` tasks passed offline after the backend

ports/mc263/README.md

@@ -5,8 +5,12 @@ with the Minecraft 1.21.1 release. The 26.3 backend persists separate Ages and
 their seeds. Books, the Book Binder, and the Ink Mixer work, and the Binder can
 author Standard, Amplified, Island, Flat, Void, or Cave terrain with supported
 biome-distribution pages, selected material/vegetation/structure features, and
-independent Age weather. Celestial/lighting systems, instability, crystal
-portals, and much of the 1.21.1 gameplay remain unported. Use a test world and keep a backup; do not
+independent Age weather and lighting, multiple authored or seeded celestial
+bodies and eclipses, biome/material completion, and random features/structures.
+Instability, crystal portals, discovery/stations, writing recovery and optional
+integration parity remain unfinished. The latest published beta is
+[1.0.1.93-beta.1](RELEASE_NOTES_1.0.1.93-beta.1.md).
+Use a test world and keep a backup; do not
 substitute this JAR for the 1.21.1 mod or import 1.21.1 saves.
 
 The entries below record how the port was built, including earlier alpha-only
@@ -558,6 +562,735 @@ Operator-only `/rivencraft_port age surface_probe <name> <x> <z>` reports the
 actual highest obstruction and a safe nearby surface without creating a
 platform or teleporting. It can generate chunks while inspecting the region.
 
+The local `1.0.1.66-beta.1` slice ports Normal, Dark, and Bright Lighting.
+One lighting page is accepted per book and its choice is saved in the Age
+index before catalog publication. Missing lighting currently defaults to
+Normal; random lighting selection and Bright's instability cost await those
+systems' later ports. Lighting pages should no longer be tinted red.
+
+Normal surface Ages retain the Overworld type. Dark removes skylight with
+ambient light 0.0; Bright uses ambient light 0.25 and retains surface skylight,
+matching 1.21.1. **Cave + Bright is supported:** it has ambient light 0.25
+without skylight. Cave Normal/Dark use no skylight and ambient light 0.0.
+Placed light sources continue working; ambient light is not a placed light
+level or a guarantee that monsters cannot spawn.
+
+The build derives three registered dimension-type variants from the current
+vanilla Overworld JSON, changing only has_skylight and ambient_light. This
+preserves native attributes/timelines and synchronizes types through the
+normal login registry exchange; no dynamic client registry mutation is used.
+These variants currently use the vanilla type, not custom runtime changes to
+the host Overworld dimension type made by another data pack.
+Saved lighting survives reload, reseed, restart and retirement rollback.
+Existing non-Cave Ages without a choice remain Normal; old Cave Ages now use
+the no-skylight baseline. Use new Ages for clear visual comparisons and avoid
+confusing previously lit chunks with the current dimension settings.
+
+Manual check: create Normal/Dark/Bright surface books and Cave + Bright;
+compare an unlit enclosed room, check placed torches, revisit/restart and
+confirm the Overworld stays unchanged. Operator diagnostics:
+`/rivencraft_port age create_lighting <name> <seed> <mode> <terrain>` and
+`/rivencraft_port age lighting_probe <name>` report the registered type,
+skylight and ambient light. Test JAR: `1.0.1.66-beta.1`.
+
+The local `1.0.1.67-beta.1` correction supersedes slice 66's Bright rendering:
+26.3's lightmap uses `minecraft:visual/ambient_light_color`, not the old
+dimension `ambient_light` field. Bright surface/Cave types now set that native
+attribute to white and ambient_light to 1.0. Cave still has no skylight.
+Bright Ages reject natural/chunk-generation hostile spawns independently of
+stored light levels. Existing mobs, passive mobs, spawners, eggs, commands
+and special-event spawns are not deleted or globally disabled. Actual block
+light propagation and plant light requirements are unchanged. Existing Bright
+Ages receive the corrected registered types after restart; no new Age needed.
+
+Planned color-page target: **ambient light color**, alongside sky/celestial
+colors. Reuse the native 26.3 attribute for authored tints; Bright defaults to
+neutral white until the color-page port. This does not enable color pages yet.
+
+The local `1.0.1.68-beta.1` replaces slice 67's special spawn veto with actual
+effective ambient brightness. The spawn event handler is removed. Bright's
+combined light-engine reading now has a minimum of 15 on server and client,
+including after sky darkening. Its white rendering attribute is retained.
+Vanilla darkness checks therefore reject light-sensitive monsters naturally;
+light-ignoring mobs, spawners and other spawn sources use their native rules,
+not Rivencraft exemptions or bans. This does not remove existing mobs.
+
+Ambient light is not stored as emitted block light or fabricated skylight.
+Consumers of combined brightness, including plant light checks, now see the
+ambient contribution. Normal/Dark and non-Rivencraft dimensions are unchanged.
+Cave Bright remains without skylight. Existing Bright Ages update on restart.
+This supersedes slice 67's statement that crop light checks are unchanged.
+
+The local `1.0.1.69-beta.1` slice seed-completes missing weather and lighting
+pages for newly bound books, including Link-Panel-only random Ages. Explicit
+pages take precedence. Cave weather remains Off, while Cave lighting can
+still choose Bright. Old Ages retain their saved choices; they are not rerolled.
+
+The supported pool uses the 1.21.1 Legacy-rank rule: Normal is rank 1, other
+choices rank 2. Lighting weights are 3:1:1 for Normal/Dark/Bright; weather
+weights are 6:1:1:1:1:1 for Normal/Fast/Slow/Off/Always/Storm. The common weight
+is derived from the supported pool size. Unported Cloudy/Rain/Snow modes are
+not selected. Independent seed salts keep a missing lighting roll unchanged
+when weather is explicitly written, and vice versa. This matches the rank
+policy, not the exact 1.21.1 seed stream/pool. No random feature list, sky or
+celestial choices are added by this slice.
+
+`/rivencraft_port age create_random <name> <seed>` uses the same environment
+resolver and logs its frozen plan. `/rivencraft_port age environment_probe
+<seed> <terrain>` inspects deterministic defaults and explicit Storm/Bright
+precedence without creating an Age. Other explicit operator fixtures keep
+their Normal defaults to isolate the feature under test.
+
+For manual checking, create several Link-Panel-only books and verify weather/
+lighting varies across Ages and persists on revisit/restart. Then author an
+explicit Normal Weather + Normal Lighting book, and a Cave + Bright book.
+Include explicit Normal pages when comparing terrain without random lighting
+or weather changes. Random blocklist policy and instability remain pending.
+
+The local `1.0.1.70-beta.1` slice ports the Overworld, Nether, and End Sky
+pages. One sky style is accepted per book and persisted independently of
+terrain, weather and lighting. Missing sky pages still use Overworld; random
+sky selection is not part of this slice. Static Sky remains unsupported/red
+until its Legacy animated renderer is ported, rather than being replaced by
+a flat gray backdrop. Color and individual celestial pages are also pending.
+
+Nether Sky uses the native no-sky backdrop and reddish fog; End Sky uses the
+native End backdrop. Neither changes dimension height, coordinate scale,
+terrain, Nether water/bed rules, or enables an End dragon fight. All lighting
+choices work with these styles, including Cave + Bright. Bright's render
+attribute and effective ambient level 15 are retained on each variant.
+
+The registered variants derive the vanilla Overworld type and preserve its
+gameplay attributes. Non-Overworld skies use a derived day timeline without
+the three sky/fog/cloud tint tracks, retaining native gameplay schedules and
+illumination while avoiding Overworld day tint on those backdrops. Their
+cloud color is transparent. Biome/weather fog modifiers still apply. Types
+sync through normal registry login; no new rendering dependency is required.
+Sky choices survive reload/reseed/restart and retirement rollback. Old Ages
+without a sky choice retain Overworld style.
+
+For visual checks, author Plains + Normal Lighting + No Weather with each
+sky page; compare the sky/fog and verify the same terrain and normal bed/water
+behavior. Then try Cave + Bright + End Sky and revisit after restarting.
+Static Sky should remain red. Operator fixtures:
+`/rivencraft_port age create_sky <name> <seed> <sky> <lighting> <terrain>` and
+`/rivencraft_port age sky_probe <name>`. Use new books to author a sky choice;
+this does not rewrite the sky choice of already-bound books.
+
+The local `1.0.1.71-beta.1` slice adds the previously pending Static Sky.
+Its client renderer adapts the 1.21.1 Legacy-style background: six independent
+48×48 noise faces, default gray tint `#929292`, and noise intensity 65–224.
+The noise updates every two world ticks. A single small dynamic texture and
+cached cube replace thousands of per-cell draw vertices; resources are closed
+with the sky renderer. No artwork or rendering dependency is added.
+
+Static Sky is now supported rather than red, and persists through the same
+Age index as other sky styles. Four registered lighting variants retain the
+existing terrain/gameplay rules. Their native skybox is NONE (no End flashes);
+only the extracted client state schedules the custom background sky pass.
+Animation state resets between frames and does not consult a different live
+world while rendering. Color pages, celestial pages, and random sky selection
+remain pending.
+
+Build and disposable dedicated-server creation/restart checks passed for
+Static + Normal + Standard and Static + Bright + Cave. These do not validate
+client rendering. For manual testing, bind a new Static Sky + Normal Lighting
++ No Weather book, look around/above/below for animated gray static, then
+visit an Overworld/End Sky Age and return to check there is no sky-state leak.
+Revisit after restarting. Also try Static Sky + Cave + Bright (look outside
+terrain or in spectator mode). The fixture accepts `static` as its sky value.
+The dedicated test server was stopped and its temporary world deleted.
+Changes remain local; no commit/push/publication was requested.
+
+The local `1.0.1.72-beta.1` slice completes seeded default sky selection for
+new Ages. Missing sky pages now choose Overworld, Nether, End, or Static
+instead of always Overworld. This applies both to Link-Panel-only books and
+authored books without a sky controller. An explicit sky page always wins.
+
+The selection uses the first random draw and seed salt from 1.21.1's
+`AgeSkyProfile.random`. Its equally likely Inherited and Overworld slots both
+use the native Overworld presentation in this port, giving effective weights
+2:1:1:1. Sky uses an independent random stream, so adding sky/weather/lighting
+controllers does not reroll the other choices, terrain, or biomes. Colors,
+individual celestial bodies, and random feature completion remain pending.
+
+The chosen sky is saved at Age creation and is not recalculated on travel,
+reload, restart, or reseed. Existing Ages (including ones with no saved sky
+entry) keep their previous presentation. Explicit diagnostic fixtures retain
+their controlled defaults; `create_random` uses the same complete environment
+resolver as player books. `environment_probe` now also checks every explicit
+sky override and cross-controller independence.
+
+For manual checking, create several new Link-Panel-only books and compare
+their sky styles. Also author a terrain/biome book without a sky page, and one
+with an explicit Overworld Sky page. Revisit/restart to check persistence.
+For repeatable operator fixtures, `create_random <name> 0` selects Nether,
+seed 2 selects Overworld, seed 6 Static, and seed 8 End. These seeds only test
+the current port selection, not complete 1.21.1 world-generation equivalence.
+No commit/push/publication is performed until explicitly requested.
+
+The local `1.0.1.73-beta.1` slice ports shared Red/Green/Blue/White/Black
+colors and their Number modifiers using the 1.21.1 additive mixing rules.
+Numbers 0–24 directly before a color contribute `number × 10`; White adds to
+all three channels and Black subtracts from them. Missing channels begin at
+zero, groups can be written in any channel order, and the completed result is
+clamped to 0–255 per channel. A color without a number gets a deterministic
+seeded amount. Numbers currently require a following color: celestial numeric
+targets and Static Sky resolution (#109) are not implemented by this slice.
+
+Color groups preceding a Sky page tint that sky; a trailing color group also
+tints the sky, matching the existing 1.21.1 behavior. The new **Ambient Light
+Color** page (Lighting creative category) consumes the preceding color group
+for ambient illumination instead. Author Bright separately when full effective
+light level 15 is wanted; this color target does not change stored block light
+or the selected lighting controller. A target without a color group leaves
+that color native. For example:
+
+`Number 24 → Blue → Overworld Sky → Number 24 → White → Ambient Light Color → Bright`
+
+This gives a blue sky/fog with white ambient illumination. Do not use an
+unmodified Blue page when an exact amount is desired: its amount is seeded.
+Explicit colors are saved once; they survive reload/reseed/restart. Existing
+Ages without a color profile remain native. There are no random color groups
+for books that do not contain color pages yet.
+
+Sky colors override the native sky/fog color attributes, tint Static Sky's
+animated cells, and multiply the native End background texture. End texture
+detail/brightness remains native; a tint does not make it a flat solid color.
+Ambient color uses 26.3's native ambient-light attribute. Both profiles sync in
+the Age catalog before travel, not through unbounded RGB dimension types.
+Client state is replaced with each catalog and cleared on disconnect. Use the
+same beta JAR on server and client: the catalog protocol has changed.
+
+Build and dedicated-server checks cover compiled color groups, native fallback,
+all four sky types, catalog encoding/decoding, reload and reseed. Client color
+rendering and page availability still need manual checking. Test the example
+above, a tinted Static/End Sky, return to an uncolored Age/Overworld, and revisit
+after restarting. `create_colors <name> <seed> <sky>` creates a repeatable Flat,
+Bright fixture with sky `#643296` and ambient `#6496c8`; `color_probe <name>`
+checks saved colors against sampled attributes and round-trips the catalog.
+No commit/push/publication is performed until explicitly requested.
+
+The local `1.0.1.74-beta.1` slice adds authored day-cycle lengths through the
+existing **Normal Time** page. Put one **Half Length**, **Full Length**,
+**Double Length**, or **Zero Length** before Normal Time. These use the
+1.21.1 period values 0.5, 1, 2, and 0 normal days respectively. Half runs twice
+as fast; Double runs half as fast. A Number immediately before a Length page
+overrides it with `number × 0.08` days (0–24), including Number 0 for stopped
+time. Normal Time without a Length uses one normal day.
+
+Zero Length freezes the native day timelines at a deterministic, saved random
+time. It does not snap back to noon on reload/reseed, and contributes no
+fractional clock interpolation. A book with no Normal Time page retains the
+existing native cycle; missing periods are not randomly completed yet.
+Until the full grammar port, a Length requires one following Normal Time page;
+repeated Length/Normal Time pages are unsupported.
+
+The implementation wraps only this Age's native Overworld-clock timeline
+sampling, on server and client. It does not change the global clock or tick
+rate. Native sun/moon angles, sky/fog/day shading, moon phase, and gameplay
+attributes supplied by those timelines use the sampled time. Weather layers
+and authored colors remain intact. Explicit RGB sky/fog overrides remain
+constant rather than acquiring day tint. Global `/time` changes still shift
+moving Ages' underlying clock; Zero remains fixed. `/time query` reports the
+global clock, not the scaled sample; use `cycle_probe` to inspect the latter.
+
+This controls the existing native pair only. Separate Sun/Moon pages, custom
+angles/phases/directions/sizes, per-body colors, eclipses, and random celestial
+completion remain pending. Normal Time does not add visible bodies to End,
+Nether or Static skies; include Overworld Sky for the visual cycle test.
+Client/server must use the same beta: the catalog protocol is now 3.
+
+For manual testing, bind **Link Panel → Half Length → Normal Time → Overworld
+Sky** (optionally add Normal Lighting and No Weather), compare with Full and
+Double, then try Zero Length and check that the sky stays still without
+bouncing. Revisit after restarting. For numeric authoring, put Number 12 before
+Full Length for a 0.96-day cycle. Existing Ages are not rewritten. Operator
+fixtures: `create_cycle <name> <seed> <half|full|double|zero> [number]` and
+`cycle_probe <name>` under `/rivencraft_port age`.
+
+Port build and disposable-server probes passed for all four lengths and
+numeric overrides, native fallback, real sun-angle/light differences, catalog
+round trips, unload/reload, and reseed preservation. Rendering/travel/reconnect
+checks still require manual validation. Changes remain local until explicitly
+requested for commit/push/publication.
+
+The local `1.0.1.75-beta.1` slice adds **Rising**, **Zenith**, **Setting**, and
+**Nadir** Phase pages and **Clockwise/Counterclockwise** Direction pages to the
+native Normal Time cycle. Put these before Normal Time, alongside an optional
+Length. This does not implement separate Sun/Moon bodies or rename Normal
+Time/Full Length; the naming cleanup is tracked separately in #110.
+
+The phase conversion matches 1.21.1's `applyInitialCelestialPhase`: written
+angles start at midnight, while native day time zero is sunrise. Rising,
+Zenith, Setting, and Nadir select native times 0, 6000, 12000, and 18000.
+A Number immediately before a Phase overrides it with `number × 15°` from
+midnight; Number 6 means sunrise, 12 noon, 18 sunset, and 0 or 24 midnight.
+These are native day-time positions, not uneased geometric sun angles.
+
+Written phase is anchored when the Age is created, independently of the
+current Overworld time and Length. Moving cycles then progress from that
+saved point. Counterclockwise runs the cycle backward; Clockwise is the
+default. This reverses the Age's day timelines, including their moon-phase
+and gameplay attributes, not just a visual disc. The global clock is untouched.
+As before, global `/time` changes can shift moving samples.
+
+With Zero Length, written Phase replaces the seeded random stopping time:
+Zero + Zenith stays at noon, Zero + Nadir at midnight. Direction has no motion
+to reverse in a stopped cycle. Without a Phase, old behavior and saved Ages
+are preserved. Origins, phase offsets, and direction survive reload, restart,
+and reseed. Old profile fields default to origin/offset zero and forward
+motion. The catalog protocol is now 4; server and client need the same beta.
+
+Interim grammar permits at most one each of Length, Phase and Direction before
+one Normal Time target. Angle/bearing, size, multiple bodies and eclipses remain
+unsupported. No random phase/direction completion was added. Example visual
+checks (include Link Panel, Overworld Sky, Normal Lighting and No Weather):
+
+- `Zero Length → Zenith → Normal Time`: frozen noon, including after restart.
+- `Zero Length → Nadir → Normal Time`: frozen midnight.
+- `Half Length → Zenith → Counterclockwise → Normal Time`: starts at noon and
+  travels backward, twice as fast. Compare with Clockwise.
+- `Zero Length → Number 6 → Nadir → Normal Time`: Number overrides Nadir to sunrise.
+
+Operator fixture: `/rivencraft_port age create_phase <name> <seed> <length>
+<rising|zenith|setting|nadir> <clockwise|counterclockwise> [phaseNumber]`.
+`cycle_probe` reports both the saved origin and current native/scaled samples.
+Build and disposable-server checks cover named/numeric phases, opposite motion,
+fixed day/night light levels, older profile defaults, catalog round trips,
+reload and reseed. Client rendering/reconnect checks remain manual. Changes
+remain local until explicitly requested for commit/push/publication.
+
+The local `1.0.1.76-beta.1` slice ports **North/East/South/West Angle** pages
+for the native Normal Time cycle. Their bearings match the 1.21.1 symbol
+values: 0°, 90°, 180°, and 270°. Put at most one Angle before Normal Time.
+A Number immediately before it overrides the bearing with `number × 15°`,
+wrapping at 360°: Number 3 is 45°, Number 12 is 180°, and Number 24 returns
+to 0°. Angle is the orbit's horizontal bearing, distinct from Phase (position
+along that orbit) and Direction (which way time progresses).
+
+The client uses the extracted saved bearing to rotate the native sun/moon
+path, star field, and sunrise/sunset glow together. The native buffers,
+textures, phase, and lighting tracks are retained. Bearing does not change
+altitude, day length, light levels, or clock direction. Without an Angle page,
+the existing native orientation is preserved; old profiles use the same
+fallback. No seeded random bearing completion was added. This does not add
+bodies to Nether/End/Static skies or port custom Sun/Moon counts, sizes,
+per-body colors, or eclipses. #110 naming work remains separate.
+
+Bearing persists in the existing cycle profile and catalog; the catalog
+protocol is now 5, requiring the same beta on server and client. Extracted
+bearing resets with sky state and is replaced at each render, preventing an
+Age's orientation from leaking into the next world. Sunrise/sunset glow is
+rotated relative to the native -90° body-path orientation, not around a
+different axis. No new textures or dimension variants are required.
+
+Visual check: bind **Link Panel → Zero Length → Rising Phase → North Angle →
+Normal Time → Overworld Sky** (Normal Lighting/No Weather help comparison).
+Compare with East/South/West Angle, then put Number 3 before North Angle for
+a 45° intermediate bearing. Use Rising/Setting rather than Zenith when
+checking bearing: a body directly overhead stays overhead under a horizontal
+rotation. Check the glow stays aligned, then travel to an unmodified Age or
+Overworld and revisit after restart.
+
+Operator fixture: `/rivencraft_port age create_angle <name> <seed>
+<north|east|south|west> [number]` creates a frozen sunrise for comparison.
+The fixture validates all 25 numeric overrides, cardinal values, timing
+independence, older profile defaults and catalog codec round trips. Dedicated
+checks cover persistence and unchanged sampled day lighting; actual rendered
+orientation remains a manual check. No commit/push/publication is performed
+until explicitly requested.
+
+The local `1.0.1.77-beta.1` slice fixes automatic sky selection for authored
+celestials. **Normal Time without a Sky page now selects Overworld Sky**,
+the current port's celestial-capable style, instead of sometimes selecting
+Nether/End/Static and hiding the native bodies. Explicit Sky pages retain
+precedence. Books without celestial pages retain the existing seeded sky
+distribution, and lighting/weather choices are unchanged. The resolver also
+recognizes Sun/Moon page intentions for their eventual port; this does not
+make those still-unported body pages bindable.
+
+This matches the visible outcome of the current bundled 1.21.1 Age path:
+its native fallback is Overworld, and its custom sky renderer draws authored
+suns/moons over its backgrounds. No 1.21.1 change or follow-up issue is needed
+for those bundled paths. The fix applies at creation of new 26.3 Ages; it
+does not rewrite existing saved sky choices. Recreate an older affected book
+to test the corrected automatic choice. Weather and terrain can still obscure
+celestials naturally; this is a compatible-sky rule, not a guarantee of a clear
+view from underground or during storms.
+
+Test **Link Panel → Normal Time**, optionally with No Weather and Normal
+Lighting, but without any Sky page. The celestial view should be present.
+Also test Length/Phase/Angle/Direction + Normal Time without a Sky page and
+confirm that an explicit Sky page still wins. `create_cycle` now exercises
+this missing-Sky path rather than forcing an explicit sky in its fixture.
+`environment_probe` verifies all three celestial intentions, explicit Sky
+precedence in either order, and unchanged lighting/weather selection.
+No commit/push/publication is performed until explicitly requested.
+
+The local `1.0.1.78-beta.1` slice ports **Small/Normal/Large Celestial**
+Size modifiers for Normal Time: 0.5×, 1× and 2× respectively. A Number page
+immediately before Size overrides that preset with the existing 1.21.1
+0.25×–3× range (Number 0 = 0.25×, 12 = 1.625×, 24 = 3×).
+As in 1.21.1, Size before Normal Time sizes its sun; the paired moon stays
+normal-sized. Standalone Sun/Moon and independent body sizing remain unported.
+Size changes neither day length nor illumination, phase or bearing. Older
+profiles default to 1×; new profiles retain size through reload/restart/reseed.
+The catalog protocol is now 6, so clients and servers must use matching builds.
+Rendering retains the native sun texture/pipeline without new GPU buffers.
+
+Test **Link Panel → Zero Length → Zenith Phase → Large Celestial → Normal
+Time**, optionally with No Weather and Normal Lighting. Compare Small and
+Normal, then Number 0/12/24 immediately before Size. No Sky page is needed.
+The sun should change size, while the moon and Overworld remain unchanged.
+Reopen the world to check persistence. `create_size <name> <seed>
+<small|normal|large> [number]` creates a frozen-noon fixture without explicit
+Sky; `cycle_probe <name>` reports its saved size and catalog round trip.
+Build and disposable-server checks passed, including all numeric sizes,
+reload, reseed, restart and unchanged sampled lighting/time. Actual rendered
+size remains a manual check. The test server stopped and its world was deleted.
+No commit/push/publication is performed until explicitly requested.
+
+The local `1.0.1.79-beta.1` slice adds shared color groups before **Normal
+Time**, tinting both its sun and moon as in 1.21.1. Use Number + Red/Green/
+Blue/White/Black pages before that controller; Length/Phase/Angle/Size can
+appear between the colors and Normal Time without losing the pending group.
+Normal Time consumes the group, so it does not tint a later Sky or Ambient
+Light Color target. Trailing colors still target the sky. Mixing, seeded
+unnumbered amounts and completed-group clamping use the existing color rules.
+
+The tint changes native sun/moon RGB only, retaining sprite transparency,
+weather fading, moon phases and existing size/orbit/time settings. It does
+not recolor stars, sunrise glow or change gameplay illumination. Older saved
+color profiles keep untinted bodies; new profiles save and sync their tint.
+Catalog protocol is now 7: use matching client/server builds. Standalone
+Sun/Moon controllers and independent per-body colors remain pending.
+
+Test **Link Panel → Zero Length → Zenith Phase → Number 24 → Red → Normal
+Time**, optionally with No Weather and Normal Lighting, for a red sun. Use
+Nadir Phase to view the same tint on the moon. Mix several colors, add a
+separate color group before Sky, and confirm that the Overworld stays normal
+after travel. Check glow transparency and persistence after reopening the
+world. The op fixture `create_celestial_color <name> <seed>
+<rising|zenith|setting|nadir> <red|green|blue|white|black> <0..24>` provides
+independently colored sky/ambient plus a frozen body for diagnostics.
+Client rendering remains a manual check; nothing is committed or published
+without an explicit request.
+
+The local `1.0.1.80-beta.1` slice supports one standalone **Sun** or **Moon**
+controller in place of Normal Time. Both accept the existing Color, Length,
+Phase, Direction, Angle and Size modifiers (including Number overrides).
+Sun omits the paired moon; Moon omits the paired sun and sunrise glow.
+Size applies to the selected standalone body, while Normal Time still sizes
+only its sun. A missing Sky selects Overworld; explicit Sky remains decisive,
+and non-Overworld body rendering is still pending.
+
+Standalone bodies use the root-style linear orbit rather than the native
+paired cycle's eased orbit. Zenith puts either body overhead, Nadir puts it
+below the world, and Rising/Setting place it at the horizon. Zero Length
+freezes that position. Gameplay skylight combines altitude with precipitation
+and the root 0.18 moonlight multiplier (overhead sun = 15, overhead moon = 6,
+below-horizon body = 4 under clear weather). Bright/Dark rules remain separate.
+Native background, stars and moon-phase schedules remain for this slice;
+multiple independent bodies, eclipse handling, and full seeded celestial
+completion are not yet supported. Catalog protocol is now 8.
+
+Test **Link Panel → Zero Length → Zenith Phase → Large Celestial → Sun**,
+then replace Sun with Moon in a new book. Each should show only that body
+overhead. Try Number + Color and Size, a moving/reversed cycle, and Nadir;
+confirm the paired Normal Time and Overworld are unaffected after travel.
+Restart and revisit. The diagnostic `create_body <name> <seed> <sun|moon>
+<rising|zenith|setting|nadir>` creates a red, large, east-bearing frozen body.
+More than one celestial controller is still rejected, not silently discarded.
+Nothing is committed or published without an explicit request.
+
+The local `1.0.1.81-beta.1` slice accepts multiple celestial controllers.
+Each Sun/Moon consumes its own preceding Color, Length, Phase, Direction,
+Angle and Size group; modifiers reset after that controller. Normal Time
+contributes a sun/moon pair with opposite phases and its usual sun-only Size.
+The 1.21.1 limit of **ten suns and ten moons** applies, counting pairs toward
+both limits. Unsupported duplicate modifiers within one group and dangling
+modifiers are still rejected; the full recovery/instability grammar is pending.
+
+Multiple bodies retain independent saved orbits/colors and draw using the
+native body resources, with suns before moons. Each has its own linear orbit;
+the first controller supplies the shared day timeline and native background/
+star/moon-phase schedules. Skylight combines positive-altitude suns (capped at
+1), or sums weaker moonlight when no sun contributes, matching the root
+aggregation rule. Explicit non-Overworld backgrounds still hide bodies.
+Catalog protocol is now 9. Older single-body/paired profiles remain unchanged.
+
+**Eclipse effects are not in this slice:** sky darkening, disc occlusion and
+corona effects will be ported next. Visual overlap alone is not an eclipse.
+
+Test two groups in one book: **Zero Length → Zenith Phase → Large Celestial
+→ Number 24 → Red → Sun**, then **Zero Length → Rising Phase → Small Celestial
+→ Number 24 → Blue → Moon** (with Link Panel first). Each should retain its
+own size, color and position. Try a moving/reversed third body, a Normal Time
+pair alongside a standalone body, restart, and travel back to an ordinary
+Age/Overworld. `/rivencraft_port age create_celestials <name> <seed>` creates a
+diagnostic three-body Age. Rendering remains a manual client check. Nothing
+is committed or published without an explicit request.
+
+The local `1.0.1.82-beta.1` slice adds eclipse effects to saved multi-body
+profiles. Contact is based on the central quarter-size discs, not their
+halos. Opposite-kind overlap progressively dims a moon and whitens a sun's
+corona. A visible eclipsed sun darkens the sky by up to 65% and reduces its
+sunlight contribution by up to 85%, using the 1.21.1 formulas. Other suns can
+still supply light; same-kind overlaps do not produce eclipses. Below-horizon
+overlap does not darken the visible sky.
+
+Each body's native transparent glow is followed by an ordinary-alpha central
+disc, so an eclipsing moon obscures the sun instead of showing it through the
+glow. During an eclipse the moon core uses the solid full-moon sprite, matching
+root's occluding disc; native phases are retained outside eclipse contact.
+Weather fading remains. Meshes are cached, rebuilt after atlas changes and
+closed with the sky renderer. No new image assets are needed. Existing Ages
+with multiple bodies get these derived effects without rebinding their books.
+
+Test **Link Panel → Zero Length → Zenith Phase → Sun → Zero Length → Zenith
+Phase → Large Celestial → Moon** (No Weather and Normal Lighting recommended).
+This holds an eclipse overhead. Change the Moon to Half Length in a new book
+to watch it pass across the sun. Verify opaque center/transparent glow, sky
+and ground darkening, restart and travel back to an ordinary dimension.
+The op fixture `/rivencraft_port age create_eclipse <name> <seed>
+<aligned|partial|clear|below|moving>` creates controlled comparisons.
+The multi-body fixture is now named `create_celestials`, avoiding a collision
+with the existing terrain-generation `create_multi` command. Catalog schema
+remains protocol 9. Explicit non-Overworld body rendering and broader seeded
+completion are still pending. Nothing is committed or published without an
+explicit request.
+
+The local `1.0.1.83-beta.1` correction makes standalone and multi-body authored
+moons use the **full-moon sprite in both glow and opaque-center passes**, as
+the 1.21.1 custom renderer does. Native dark lunar-phase pixels could become
+black patches once the new ordinary-alpha center pass made them opaque.
+The native Normal Time pair keeps its calendar phases. Eclipse geometry,
+darkening and corona formulas are unchanged; genuinely eclipsed moons still
+turn dark and obscure their overlapping sun.
+
+Read-only inspection of the reported `celest` save found all four body colors
+intact (`-1`, untinted). Its first moon and second sun share period, direction,
+phase, origin and bearing, creating a permanent eclipse after eclipse support
+was added. This is separate from the phase-sprite rendering correction. No
+saved orbits/colors are rewritten, and existing Ages need not be recreated.
+Please revisit `celest`, compare a nonaligned authored moon, check an eclipse
+and resource reload, then return to Overworld/Normal Time to confirm native
+phases are unaffected. This rendering correction still needs a client check.
+Nothing is committed or published without an explicit request.
+
+The local `1.0.1.84-beta.1` slice renders authored **Normal Time, Sun, Moon
+and multiple bodies over all four Sky styles**, including explicit Nether,
+End and animated Static. Backgrounds draw first; the existing authored body
+pass follows with its colors, sizes, orbits, opaque centers and eclipse effects.
+Nether retains its fog backdrop, End retains its native sky texture, and
+Static keeps animating. These are presentation changes only: no Nether/End
+terrain, ceiling, coordinate-scale or dragon behavior is introduced.
+
+Eclipses shade End/Static background tint and the Nether-style fog backdrop;
+gameplay light still uses the saved body profile. Native Overworld rendering
+and no-celestial Ages are unchanged. No new assets, saved fields or catalog
+protocol changes are needed. Already-created Ages with explicit backgrounds
+and authored celestials gain the rendering on update without rebinding.
+
+Test the same frozen overhead Sun/Moon book with **Nether Sky**, **End Sky**
+and **Static Sky**, then test a moving body and eclipse in each. Check body
+colors/size, no duplicate bodies, unchanged background style, Static animation,
+F3+T, restart and travel to Overworld. The existing diagnostic
+`age create_eclipse <name> <seed> <mode> [overworld|nether|end|static]` now
+accepts an optional explicit Sky for comparisons. Client rendering remains a
+manual check. Nothing is committed or published without an explicit request.
+
+The local `1.0.1.85-beta.1` slice randomizes a **bare Sun or Moon page** when
+a new Age is created. Each such controller gets its own deterministic color,
+size, bearing, phase, direction and length. Defaults use the root random-Age
+palette (mixing 1–3 colors), size 0.75×–1.75×, bearing 0–359°, full-cycle phase,
+either direction, and length 0.2–2 days with Legacy's 1-in-7 stopped-cycle
+chance. Sun/Moon counts still come from your pages; nothing adds extra bodies.
+
+This applies only when that controller has **no written celestial modifiers**.
+If its group includes Color, Size, Angle, Phase, Direction or Length, the
+existing explicitly authored behavior is retained, including defaults for
+its other fields. Sky/ambient colors consumed by their own target and unrelated
+terrain/weather/lighting pages do not make a body authored or reshuffle its
+random settings. Normal Time is unchanged. Groups use Age seed plus controller
+ordinal; repeated bare pages get independent settings. Choices are saved,
+not rerolled on GUI opening, reload/restart or terrain reseeding.
+
+Test a **new** book with **Link Panel → Sun → Moon → Sun**, optionally adding
+No Weather and Normal Lighting for visibility. Expect varied colors/sizes/
+orbits; some bodies can be below the horizon or stopped. Test an explicitly
+modified body in the same book, then restart and revisit. Existing Ages keep
+their original saved settings and are not randomized retroactively. The op
+fixture `age create_random_celestials <name> <seed>` tests independent seeded
+defaults and bounds. Nothing is committed or published without explicit request.
+
+The local `1.0.1.86-beta.1` slice completes the celestial branch for **new
+books with no celestial controller pages**, including Link-Panel-only books.
+The Age seed chooses **0–3 suns and 0–3 moons**, following the root random
+count draws. Each body receives the independent saved settings introduced
+in .85. An explicit Sun, Moon or Normal Time suppresses this extra-body
+completion entirely; its written controllers remain authoritative.
+
+A valid zero-sun/zero-moon result draws neither body nor sunrise glow, rather
+than accidentally falling back to a vanilla pair. This does not force Dark
+Lighting: background/star schedules and independent lighting retain their
+normal behavior. Random background selection remains independent of body
+counts, and all supported Sky styles can render the chosen bodies. Default
+sky colors retain their current behavior; this slice completes bodies only.
+
+Choices persist through restart and terrain reseeding. Existing Ages are not
+rerolled. Catalog protocol is now **10**, requiring matching client/server
+builds. Test several new Link-Panel-only books, plus books that contain only
+terrain/weather/lighting/Sky pages. Expect varied counts, including sun-only,
+moon-only and empty skies; some bodies may be below the horizon. Compare an
+explicit one-Sun book and a Normal Time book, then restart and revisit.
+`age create_completed_sky <name> <seed> [overworld|nether|end|static]` provides
+clear-weather Flat fixtures and reports a sample zero-body seed. The existing
+`age create_random` now also uses the completed celestial plan. Nothing is
+committed or published without explicit request.
+
+The local `1.0.1.87-beta.1` slice gives **new Link-Panel-only random Ages**
+a saved random sky/fog tint, matching 1.21.1's seeded palette and rounded
+mix of 1–3 colors. This completes the sky-color draw already reserved by the
+random celestial count selection. Body settings/counts are unchanged.
+
+Books containing symbol pages keep their authored/default color rules; a
+black authored sky remains black. Ambient lighting is not randomized by this
+change. Existing Ages retain their saved colors. No new saved fields or
+catalog protocol change is needed. Create several new Link-Panel-only books,
+check sky/fog colors and restart persistence, then compare an explicitly
+colored Sky book and an uncolored terrain-only book. Nothing is committed or
+published without explicit request.
+
+The local `1.0.1.88-beta.1` slice seed-completes **explicit biome distribution
+pages with missing biome pages**. Single Biome alone selects one eligible
+biome. Tiled/Grid/region controllers alone choose at least two distinct
+biomes, using 1.21.1's seeded continuation rule and the available pool as the
+maximum. With one authored biome they fill just the missing second biome;
+with two distinct authored biomes they add nothing. Repeated biome pages keep
+their weight but do not satisfy the distinct-biome minimum by themselves.
+
+Cave completion draws only recognized Cave/Nether biomes. Void supplies The
+Void only when no biome is authored; a multi-biome Void book needs sufficient
+explicit biome pages rather than acquiring an unwanted Void biome. Native
+still rejects biome pages. No-controller biome behavior is unchanged, and
+the broader recovery/instability grammar is not part of this slice.
+
+Test a new Link Panel + Tiny Biome Regions book, Single Biome alone, and Tiny
+with one/two specific biome pages. Also try Cave + Tiny and restart/revisit.
+The operator fixture is `age create_completed_biomes <name> <seed> <terrain>
+<distribution>`; `age biome_pool <name>` inspects the generator without loading
+chunks. Existing Age pools do not change. Nothing is committed or published
+without explicit request.
+
+The local `1.0.1.89-beta.1` slice supports **unpaired Block/Fluid pages**.
+When no feature immediately follows a material, the Age seed and original
+page position choose a compatible implied feature, following 1.21.1's model.
+Explicit material → feature pairs remain unchanged. Consecutive material
+pages each receive their own selection; the resulting choices may repeat.
+Only the saved feature plans gain these implied choices, not extra physical
+pages in the book.
+
+Solid candidates are Rocks, Floating Islands, Tendrils, Spheres, Spikes and
+Obelisks, restricted by terrain. Cave permits Tendrils/Spheres; Void also
+permits Floating Islands. Flat excludes Rocks. Fluid candidates are the three
+lake types on supported surface noise terrain. An unpaired fluid on Flat,
+Void or Cave is still refused because no compatible lake implementation is
+available there. Explicit incompatible pairings and existing 32-feature
+limits are unchanged; the full recovery/instability grammar remains pending.
+
+Test Link Panel + Glowstone, consecutive Glowstone/Stone pages, and an unpaired
+Water page on Standard terrain. Compare an explicit Glowstone → Tendrils
+pair, try a solid on Cave/Void, and restart/revisit. Existing Ages retain
+their saved features. Operator diagnostics: `age create_implied_material
+<name> <seed> <terrain> <material-id>` and `age feature_plan <name>` (no chunk
+generation). Nothing is committed or published without explicit request.
+
+The local `1.0.1.90-beta.1` slice adds **random material features to new
+Link-Panel-only Ages**. The Age seed rolls 0–2 distinct feature types using
+1.21.1's Legacy rank weighting, then chooses a registered compatible solid
+or source fluid for each. Candidates are Rocks, Floating Islands, Tendrils,
+Spheres, Spikes, Obelisks and the three lake types, filtered by terrain.
+
+The same creation pass rolls rare Skylands (1-in-8 on noise terrain), Crystal
+Formations (1-in-10 on exposed surface terrain), and Star Fissures using the
+root small-feature grammar. These are additional to the 0–2 material features.
+Random structure selection and page-eligibility config remain future port
+work. Authored books do not gain unrequested random features, and existing
+Age plans are not rerolled. Choices persist through restart and reseed.
+
+Test several new Link-Panel-only books for varied material features, including
+Ages with none; compare an explicitly authored book and revisit after restart.
+For controlled checks, `age create_random_features <name> <seed> <terrain>`
+creates a feature-only fixture and `age feature_plan <name>` reports its
+saved generator choices without generating chunks. `age create_random` uses
+the same production selector. Nothing is committed or published without
+explicit request.
+
+The local `1.0.1.91-beta.1` slice ports **random structure selection** from
+1.21.1. New Link-Panel-only Ages roll 0–2 distinct structure families in
+addition to .90's material features. Legacy ranks prefer Villages, Strongholds
+and Mineshafts, followed by Dungeons/Fortresses; newer structures are rarer.
+The 26.3 Abandoned Camps page joins that rare pool. Candidates must support
+the terrain and at least one biome in the actual selected biome pool.
+
+A saved structure-control flag distinguishes an intentionally empty selection
+from older Ages' native behavior. Unselected page-controlled structure sets
+are disabled even when no structures were chosen; other native structure
+families remain governed by vanilla biome rules. Authored pages retain their
+biome override behavior, and old saved Ages are not changed. Cave Dungeons
+remain excluded by the port's existing terrain restriction; this is a known
+remaining difference from 1.21.1, not a new root behavior.
+
+Test several new random Ages, including a restart/revisit, and compare an
+authored Village book. For focused checks, `age create_random_structures
+<name> <seed> <terrain> <biome-id|native>` creates a controlled fixture;
+`age feature_plan <name>` reports the frozen selection, including Dungeons.
+No catalog protocol change is needed. Nothing is committed or published
+without explicit request.
+
+The local `1.0.1.92-beta.1` slice enables **Dungeons on Cave terrain**, including
+Nether cave biomes, matching 1.21.1's noise-terrain support. The already-ported
+placement JSON is byte-identical to root: eight vanilla monster-room attempts
+per page, uniformly from one block above the minimum to one below the maximum
+build height. Vanilla still requires a suitable enclosed chamber; an attempt
+is not a guaranteed dungeon. Stacking up to 32 pages is unchanged.
+
+Only the combined Cave dungeon/lake rejection was split: lakes remain rejected
+there, and Flat/Void still reject Dungeons. New random Cave Ages can now select
+Dungeons through .91's normal eligibility/rank rules. Existing saved plans
+are unchanged. `age create_dungeons <name> <seed> cave` creates an eight-page
+fixture. `age dungeons_probe <name> [chunks]` optionally limits the search to
+1–4 chunks per side; omitting it retains the previous 4×4 search. That probe
+generates chunks and is reserved for manual placement checks.
+
+Test Cave + Dungeons, optionally stacking pages for visibility; use spectator
+mode to find monster rooms and compare a Nether-biome Cave Age. This slice's
+server validation checks authoring and persistence without generating a large
+region. No saved-field/protocol change is needed. Nothing is committed or
+published without explicit request.
+
+The local `1.0.1.93-beta.1` slice fixes **Nether and End biome materials on
+noise terrain**, including Nether biomes in Cave Ages. The port had retained
+the vanilla terrain's Overworld material rules, which could coat Nether
+biomes in grass. It now ports 1.21.1's biome rule layer: the five vanilla End
+biomes use the registered End rule, the five vanilla Nether biomes use the
+registered Nether rule, and all other biomes retain the terrain's original
+rules. Nether coverings include Nylium, Soul Sand/Soil, Basalt and Blackstone
+where their native rules select them; End areas use End Stone.
+
+Noise geometry, biome selection, lighting, default fluids, sea level and dry
+Cave aquifer settings remain unchanged. This is not a Flat/Void layer rewrite.
+The correction applies after reload to **new chunks only** in existing Ages;
+already generated grass is not replaced. Test a new Nether-biome Cave Age
+and End-biome Standard/Island Age, or explore new chunks after restarting.
+
+Operator fixtures: `age create_biome_surface <name> <seed> <terrain> <biome-id>`
+and `age material_probe <name> [chunk_x chunk_z]`. The latter examines one
+terrain-stage chunk (default 0,0) without feature, lighting or entity generation. Nothing is committed
+or published without explicit request.
+
 From the repository root:
 
 ```sh

ports/mc263/RELEASE_NOTES_1.0.1.71-beta.1.md

@@ -0,0 +1,59 @@
+# Rivencraft 26.3 beta 1.0.1.71-beta.1
+
+This beta collects the player-tested lighting and sky port slices since
+1.0.1.65-beta.1. It is not yet feature-complete with Minecraft 1.21.1.
+
+## Lighting and seeded environments
+
+- Added Normal, Dark, and Bright lighting pages with saved per-Age settings.
+- Bright works in Cave terrain too, without adding skylight or weather.
+- Bright supplies effective ambient light level 15 to native combined-light
+  checks and the white ambient rendering attribute. Vanilla darkness-based
+  monster checks respond to that lighting; there is no separate mob-spawn
+  veto. Mobs that ignore light retain their normal rules.
+- Missing weather and lighting controllers now resolve deterministically from
+  the Age seed, using independent choices and Legacy-style Normal weighting.
+  Explicit pages win; Cave terrain still forces weather Off. Existing Ages
+  keep their saved choices rather than rerolling on load.
+
+## Sky styles
+
+- Added Overworld, Nether, End, and animated Static Sky pages, independently
+  of terrain, weather, and lighting. Choices persist on reload and restart.
+- Nether Sky uses a reddish fog backdrop; End Sky uses the native End sky.
+  These are visual styles, not Nether/End terrain or gameplay conversions:
+  dimension geometry, coordinate scale, bed/water rules, and dragon behavior
+  are not changed.
+- Static Sky adapts the existing Legacy-style renderer: six independent
+  48×48 animated gray noise faces. A cached cube and small dynamic texture
+  avoid rebuilding thousands of per-cell vertices each frame. Client-only
+  rendering resources are released with the sky renderer.
+- Non-Overworld backgrounds have transparent clouds and a derived day
+  timeline that avoids Overworld sky/fog/cloud color tracks while retaining
+  gameplay and illumination schedules.
+- Updated supported-page feedback and added operator sky/environment probes.
+
+## Current limits and testing
+
+- Missing Sky pages still default to Overworld; random sky selection, color
+  pages and individual celestial bodies remain pending. Number-controlled
+  Static Sky resolution is tracked separately in issue #109 for both versions.
+- The writing/discovery loop, instability, portals, and optional-integration
+  parity are still incomplete. Creative availability is not a support claim;
+  check page tooltips and the beta guide for supported combinations.
+- Previously generated chunks are not regenerated. Save compatibility during
+  the beta is not guaranteed; keep backups and keep both version tracks apart.
+
+The player reported in-game passes for the included slices, including Static
+Sky. Build checks passed for both version tracks. Targeted disposable-server
+checks covered environment defaults, explicit choices, registered sky/lighting
+variants, persistence and restart, including Cave + Bright and Static Sky.
+This is not a claim of complete dedicated-server or optional-mod coverage.
+Test servers were stopped and temporary worlds removed.
+
+Requires Minecraft **26.3**, NeoForge **26.3.0.99** and **Java 25**. Dynamic
+Dimensions and Bad Packets are not required by this build. The 1.21.1 release
+and its dependencies are unchanged.
+
+Report issues and help improve the wiki at
+[BlackSheep Git](https://git.paddedcell.org/dnorberg/rivencraft).

ports/mc263/RELEASE_NOTES_1.0.1.78-beta.1.md

@@ -0,0 +1,53 @@
+# Rivencraft 26.3 beta 1.0.1.78-beta.1
+
+Collects the player-validated port slices since 1.0.1.71-beta.1. This beta is
+not yet feature-complete with the Minecraft 1.21.1 version.
+
+## Sky and color writing
+
+- Missing Sky pages now select a deterministic seeded style. Books with
+  Normal Time and no explicit Sky select celestial-compatible Overworld Sky.
+  Explicit Sky pages always win; weather and lighting choices stay independent.
+- Ported Red, Green, Blue, Black and White color pages. Preceding Number pages
+  control component strength; unnumbered colors use seeded values. Colors mix
+  before clamping the completed group. Colors before Sky tint that sky; a
+  trailing color group also targets the sky.
+- Added an Ambient Color controller for an independent ambient-light tint.
+  Color alone does not change effective illumination or monster-spawn rules.
+- Native, End and animated Static backgrounds use saved Age color settings.
+
+## Normal Time celestial controls
+
+- Length pages control the native day cycle; a preceding Number fine-tunes
+  length. Zero Length freezes the cycle at a seeded time or an authored Phase,
+  without interpolation bounce or changing the shared Overworld clock.
+- Rising, Zenith, Setting and Nadir Phase pages choose the starting phase.
+  Clockwise and Counterclockwise control direction. North, East, South and
+  West Angle pages choose orbit bearing. Preceding Number pages fine-tune
+  Phase and Angle in 15-degree increments.
+- Small, Normal and Large Celestial size Normal Time's sun to 0.5×, 1× and 2×.
+  A preceding Number overrides size from 0.25× to 3×. As in 1.21.1, the paired
+  moon remains normal-sized. Size does not alter illumination or day length.
+- Settings persist through reload/restart and remain stable when reseeding
+  future terrain. Older profiles retain native/default values.
+- Added operator diagnostics for environment, color and celestial profiles.
+
+## Compatibility and testing
+
+- Catalog protocol is now 6: use matching client/server builds.
+- Player in-game checks passed for the included slices. Build checks and
+  targeted disposable-server diagnostics covered numeric modifiers, catalog
+  round trips, unchanged sampled lighting, reload, reseed and restart.
+- Standalone Sun/Moon controllers, multiple bodies, per-body colors, eclipses,
+  full writing/discovery, instability, portals and optional-integration parity
+  remain incomplete. Creative availability does not imply full page support.
+- Number-controlled Static Sky resolution remains tracked in issue #109;
+  time-page naming improvements remain tracked in issue #110.
+- Existing chunks are not regenerated. Save compatibility is not guaranteed
+  during beta; keep backups and keep the two Minecraft version tracks apart.
+
+Requires Minecraft **26.3**, NeoForge **26.3.0.99**, and **Java 25**. Dynamic
+Dimensions and Bad Packets are not required. Minecraft 1.21.1 is unchanged.
+
+Report issues and help improve the wiki at
+[BlackSheep Git](https://git.paddedcell.org/dnorberg/rivencraft).

ports/mc263/RELEASE_NOTES_1.0.1.93-beta.1.md

@@ -0,0 +1,83 @@
+# Rivencraft 26.3 beta 1.0.1.93-beta.1
+
+Collects the player-validated port slices .79–.93 since 1.0.1.78-beta.1.
+This beta is not yet feature-complete with Minecraft 1.21.1.
+
+## Celestial writing and rendering
+
+- Ported standalone Sun and Moon pages and multiple independently authored
+  bodies, up to ten of each. Each controller consumes its own ordered Color,
+  Length, Phase, Direction, Angle and Size modifiers; Number pages fine-tune
+  supported values. Normal Time retains its paired sun/moon behavior.
+- Color groups before Normal Time tint both bodies; independent Sun/Moon
+  groups can use different colors. Authored moons use full-moon sprites as in
+  1.21.1; native Normal Time retains calendar moon phases.
+- Authored bodies render over Overworld, Nether, End and animated Static
+  backgrounds. Opaque centers retain transparent glows. Eclipse alignment
+  affects body color, background shading and gameplay sky light.
+- Bare Sun/Moon pages receive independent seeded colors, sizes, bearings,
+  phases, directions and lengths, including stopped cycles. Explicit modifier
+  groups retain their authored behavior.
+- Books without celestial controllers seed-complete 0–3 suns and 0–3 moons.
+  Empty skies do not accidentally draw a vanilla pair. Explicit controllers
+  suppress extra-body completion. Link-Panel-only random Ages also receive
+  seeded sky/fog colors using the 1.21.1 palette.
+- All resolved settings are saved, not rerolled by viewing a book, restarting,
+  or reseeding future terrain. Existing Age profiles remain unchanged.
+
+## Biome and feature completion
+
+- Explicit biome-distribution pages can now seed-complete missing biome
+  pools. Single selects one; other nonnative controllers require two distinct
+  biomes. Fully omitted pools use the seeded continuation rule, bounded by the
+  available biome pool. Authored pools fill only the missing minimum.
+- Supplied biome order and duplicate weights are retained. Two distinct
+  supplied biomes do not acquire an unwanted third biome. Cave pools use
+  recognized Cave/Nether biomes; Void does not inject The Void alongside
+  supplied biome pages.
+- Unpaired Block/Fluid pages receive seeded terrain-compatible implied
+  features. Consecutive materials resolve independently; explicit pairs remain
+  authoritative. Unsupported pairings and the current feature caps remain.
+- Link-Panel-only Ages roll 0–2 distinct material feature types with Legacy
+  rank weighting and compatible registered solids/source fluids. Additional
+  rare rolls cover Skylands, Crystal Formations and Star Fissures.
+- Random Ages also roll 0–2 distinct structure families, filtered by terrain,
+  registry availability and the chosen biome pool. Newer structures, including
+  26.3 Abandoned Camps, are rare candidates. An intentionally empty selection
+  disables page-controlled structure sets rather than enabling all of them.
+- Cave terrain now supports authored and randomly selected Dungeons, matching
+  1.21.1. Dungeon placement retains eight monster-room attempts per page and
+  modern build-height anchors. Flat/Void Dungeons and Cave lakes remain
+  unsupported.
+
+## Nether and End material correction
+
+- Ported 1.21.1's biome-specific material-rule layer for noise terrain. Nether
+  biomes in Cave Ages now use their native Netherrack, Nylium, Soul Sand/Soil,
+  Basalt and Blackstone rules instead of Overworld grass. End biomes use End
+  Stone. Other biomes retain the original terrain rules.
+- Geometry, biome selection, dry Cave aquifers and other environment settings
+  are preserved. Flat/Void layers and authored feature materials are unchanged.
+- Existing Ages pick up the correction after reload, but only new chunks
+  change. Already generated grass is not replaced.
+
+## Compatibility and validation
+
+- Requires Minecraft **26.3**, NeoForge **26.3.0.99**, and **Java 25**. Dynamic
+  Dimensions and Bad Packets are not required. Minecraft 1.21.1 is unchanged.
+- Catalog protocol is **10**: use matching client/server builds.
+- Player in-game checks passed for all included slices. Builds and targeted
+  disposable-server checks covered writing, seeded completion, codecs/catalog
+  round trips, terrain materials, reload, reseed and restart. Temporary servers
+  and test worlds were removed. This is not a full automated GameTest run.
+- Full writing recovery, discovery/stations, instability, portals and optional
+  integration parity remain unfinished. Random-page eligibility config also
+  remains pending; valuable/hazardous random materials currently lack the
+  finished version's instability scoring. Creative availability does not imply
+  full page support. Number-controlled Static resolution (#109) and time-page
+  naming (#110) remain separate work.
+- Beta save compatibility is not guaranteed. Back up worlds and keep the two
+  Minecraft version tracks and saves separate.
+
+Report issues and help improve the wiki at
+[BlackSheep Git](https://git.paddedcell.org/dnorberg/rivencraft).

ports/mc263/build.gradle

@@ -121,6 +121,71 @@ def generatePortLanguage = tasks.register('generatePortLanguage', GeneratePortLa
 }
 sourceSets.main.resources.srcDir generatePortLanguage
 
+// Derive registered presentation variants without duplicating vanilla gameplay settings.
+abstract class GeneratePortDimensionTypes extends DefaultTask {
+    @InputFile abstract RegularFileProperty getMinecraftJar()
+    @OutputDirectory abstract DirectoryProperty getOutputDir()
+
+    @TaskAction void generate() {
+        new java.util.zip.ZipFile(minecraftJar.get().asFile).withCloseable { archive ->
+            def entry = archive.getEntry('data/minecraft/dimension_type/overworld.json')
+            if (entry == null) throw new GradleException('Missing vanilla Overworld dimension type')
+            String template = archive.getInputStream(entry).withCloseable { it.getText('UTF-8') }
+            def dayEntry = archive.getEntry('data/minecraft/timeline/day.json')
+            if (dayEntry == null) throw new GradleException('Missing vanilla day timeline')
+            def day = archive.getInputStream(dayEntry).withCloseable {
+                new groovy.json.JsonSlurper().parseText(it.getText('UTF-8'))
+            }
+            // Keep gameplay schedules and illumination, but do not tint these
+            // native non-Overworld sky backgrounds blue/black with the day cycle.
+            ['fog_color', 'sky_color', 'cloud_color'].each { day.tracks.remove("minecraft:visual/${it}".toString()) }
+            // Markers are global per clock and already owned by minecraft:day.
+            day.remove('time_markers')
+            File dayFile = new File(outputDir.get().asFile, 'data/rivencraft/timeline/age_sky_day.json')
+            dayFile.parentFile.mkdirs()
+            dayFile.text = groovy.json.JsonOutput.prettyPrint(groovy.json.JsonOutput.toJson(day)) + '\n'
+            File timelineTag = new File(outputDir.get().asFile, 'data/rivencraft/tags/timeline/age_sky.json')
+            timelineTag.parentFile.mkdirs()
+            timelineTag.text = groovy.json.JsonOutput.prettyPrint(groovy.json.JsonOutput.toJson([
+                    values: ['#minecraft:universal', 'rivencraft:age_sky_day',
+                             'minecraft:moon', 'minecraft:early_game']])) + '\n'
+            ['overworld', 'nether', 'end', 'static'].each { sky ->
+                ['age_normal', 'age_dark', 'age_bright', 'age_cave_bright'].each { lighting ->
+                    if (sky == 'overworld' && lighting == 'age_normal') return
+                    String name = lighting + (sky == 'overworld' ? '' : "_sky_${sky}")
+                    def definition = new groovy.json.JsonSlurper().parseText(template)
+                    definition.has_skylight = lighting in ['age_normal', 'age_bright']
+                    definition.ambient_light = lighting in ['age_bright', 'age_cave_bright'] ? 1.0 : 0.0
+                    // 26.3's lightmap reads this attribute, not ambient_light.
+                    if (definition.ambient_light == 1.0)
+                        definition.attributes['minecraft:visual/ambient_light_color'] = '#ffffff'
+                    if (sky != 'overworld') {
+                        definition.skybox = sky == 'end' ? 'end' : 'none'
+                        definition.attributes['minecraft:visual/fog_color'] = sky == 'static' ? '#929292' : sky == 'end' ? '#181318' : '#6b2725'
+                        definition.attributes['minecraft:visual/sky_color'] = sky == 'static' ? '#929292' : sky == 'end' ? '#000000' : '#6b2725'
+                        definition.attributes['minecraft:visual/cloud_color'] = '#00000000'
+                        if (sky == 'nether') {
+                            definition.attributes['minecraft:visual/fog_start_distance'] = 10.0
+                            definition.attributes['minecraft:visual/fog_end_distance'] = 96.0
+                        }
+                        definition.timelines = '#rivencraft:age_sky'
+                    }
+                    File result = new File(outputDir.get().asFile, "data/rivencraft/dimension_type/${name}.json")
+                    result.parentFile.mkdirs()
+                    result.text = groovy.json.JsonOutput.prettyPrint(groovy.json.JsonOutput.toJson(definition)) + '\n'
+                }
+            }
+        }
+    }
+}
+
+def generatePortDimensionTypes = tasks.register('generatePortDimensionTypes', GeneratePortDimensionTypes) {
+    dependsOn 'createMinecraftArtifacts'
+    minecraftJar.set(layout.buildDirectory.file("moddev/artifacts/minecraft-patched-${neo_version}.jar"))
+    outputDir.set(layout.buildDirectory.dir('generated/resources/dimensionTypes'))
+}
+sourceSets.main.resources.srcDir generatePortDimensionTypes
+
 tasks.named('processResources', ProcessResources).configure {
     // Reuse the existing sprite and base model without copying binary assets.
     from('../../src/main/resources') {

ports/mc263/gradle.properties

@@ -7,4 +7,4 @@ neo_version=26.3.0.99
 mod_id=rivencraft
 mod_name=Rivencraft
 mod_license=LGPL-3.0-or-later
-mod_version=1.0.1.65-beta.1
+mod_version=1.0.1.93-beta.1

ports/mc263/port_en_us.json

@@ -8,6 +8,41 @@
   "item.rivencraft.page.unresolved": "Unknown Symbol Page",
   "item.rivencraft.page.symbol.implemented": "Implemented in 26.3; book and terrain requirements still apply.",
   "symbol.rivencraft.weather.normal.description": "Use an independent normal weather cycle. Cave terrain keeps weather off.",
+  "symbol.rivencraft.sky.overworld.description": "Use the native Overworld sky. Terrain and lighting remain independently authored.",
+  "symbol.rivencraft.sky.nether.description": "Use a Nether-style reddish fog backdrop. Authored celestials render over it; terrain and gameplay rules remain independent.",
+  "symbol.rivencraft.sky.end.description": "Use the native End sky backdrop with authored celestials over it, without End terrain or a dragon fight.",
+  "symbol.rivencraft.sky.static.description": "Animated static surrounds the Age, behind authored celestials. Preceding colors tint it; otherwise it is gray.",
+  "symbol.rivencraft.lighting.ambient_color": "Ambient Light Color",
+  "symbol.rivencraft.lighting.ambient_color.description": "Apply preceding shared colors to ambient light. Use Bright separately for full effective ambient lighting.",
+  "symbol.rivencraft.number.description": "Before Color: value × 10 per channel. Before Length: value × 0.08 days. Before Phase/Angle: value × 15 degrees. Before Size: 0.25× to 3× (0-24).",
+  "symbol.rivencraft.size.small.description": "Before Sun/Moon: 0.5× body size. Before Normal Time: size the sun only. A preceding Number overrides the size.",
+  "symbol.rivencraft.size.normal.description": "Before Sun/Moon: 1× body size. Before Normal Time: size the sun only. A preceding Number selects 0.25× through 3× (0-24).",
+  "symbol.rivencraft.size.large.description": "Before Sun/Moon: 2× body size. Before Normal Time: size the sun only. A preceding Number selects 0.25× through 3× (0-24).",
+  "symbol.rivencraft.angle.north.description": "Before Normal Time, Sun or Moon: set orbit bearing to 0 degrees. A preceding Number overrides Angle in 15-degree steps.",
+  "symbol.rivencraft.angle.east.description": "Before Normal Time, Sun or Moon: set orbit bearing to 90 degrees. A preceding Number overrides Angle in 15-degree steps.",
+  "symbol.rivencraft.angle.south.description": "Before Normal Time, Sun or Moon: set orbit bearing to 180 degrees. A preceding Number overrides Angle in 15-degree steps.",
+  "symbol.rivencraft.angle.west.description": "Before Normal Time, Sun or Moon: set orbit bearing to 270 degrees. A preceding Number overrides Angle in 15-degree steps.",
+  "symbol.rivencraft.phase.rising.description": "Before a celestial controller: start the sun or standalone moon at rising. A preceding Number overrides Phase in 15-degree steps from Nadir.",
+  "symbol.rivencraft.phase.zenith.description": "Before a celestial controller: start the sun or standalone moon overhead. Zero Length holds this position.",
+  "symbol.rivencraft.phase.setting.description": "Before a celestial controller: start the sun or standalone moon at setting. A preceding Number overrides Phase in 15-degree steps from Nadir.",
+  "symbol.rivencraft.phase.nadir.description": "Before a celestial controller: start the sun or standalone moon below the world. Zero Length holds this position.",
+  "symbol.rivencraft.direction.clockwise.description": "Before Normal Time, Sun or Moon: advance this Age's celestial cycle in its usual direction.",
+  "symbol.rivencraft.direction.counterclockwise.description": "Before Normal Time, Sun or Moon: reverse this Age's celestial cycle. Does not change the Overworld clock.",
+  "symbol.rivencraft.celestial.normal_time.description": "Add a sun/moon pair. Preceding modifiers apply to this pair; Size affects its sun only. Colors tint both. Limit ten suns and ten moons per Age.",
+  "symbol.rivencraft.celestial.sun.description": "Add a sun. A bare page gets saved seeded color, size and orbit controls. Written modifiers preserve authored behavior and reset per controller. Moon alignment causes eclipses; limit ten suns.",
+  "symbol.rivencraft.celestial.moon.description": "Add a moon with weaker light. A bare page gets saved seeded color, size and orbit controls. Written modifiers preserve authored behavior and reset per controller. Sun alignment causes eclipses; limit ten moons.",
+  "symbol.rivencraft.period.zero.description": "Before Normal Time, Sun or Moon: freeze at the written Phase, or a saved seeded time if omitted. A preceding Number overrides the Length.",
+  "symbol.rivencraft.period.half.description": "Before Normal Time, Sun or Moon: a half-length cycle (twice as fast). A preceding Number sets Length to value × 0.08 days.",
+  "symbol.rivencraft.period.full.description": "Before Normal Time, Sun or Moon: a normal-length cycle. A preceding Number sets Length to value × 0.08 days.",
+  "symbol.rivencraft.period.double.description": "Before Normal Time, Sun or Moon: a double-length cycle (half as fast). A preceding Number sets Length to value × 0.08 days.",
+  "symbol.rivencraft.color.red.description": "Add red to the next Sky, Ambient Light Color or celestial controller; trailing colors tint the sky. Precede with a Number, or use a seeded amount.",
+  "symbol.rivencraft.color.green.description": "Add green to the next Sky, Ambient Light Color or celestial controller; trailing colors tint the sky. Precede with a Number, or use a seeded amount.",
+  "symbol.rivencraft.color.blue.description": "Add blue to the next Sky, Ambient Light Color or celestial controller; trailing colors tint the sky. Precede with a Number, or use a seeded amount.",
+  "symbol.rivencraft.color.white.description": "Add equally to all RGB channels. Precede with a Number, or use a seeded amount.",
+  "symbol.rivencraft.color.black.description": "Subtract equally from all RGB channels. Precede with a Number, or use a seeded amount.",
+  "symbol.rivencraft.lighting.normal.description": "Use normal skylight and ambient brightness. Cave terrain remains without skylight.",
+  "symbol.rivencraft.lighting.dark.description": "Remove skylight from this Age; placed light sources still work.",
+  "symbol.rivencraft.lighting.bright.description": "Provide full ambient brightness and effective light level 15. Vanilla light-based spawn rules apply, including in Cave terrain without skylight.",
   "symbol.rivencraft.weather.fast.description": "Use the faster Legacy weather cycle in this Age only. Cave terrain keeps weather off.",
   "symbol.rivencraft.weather.slow.description": "Use the slower Legacy weather cycle in this Age only. Cave terrain keeps weather off.",
   "symbol.rivencraft.weather.off.description": "Keep this Age clear without changing Overworld weather.",
@@ -49,8 +84,10 @@
   "symbol.rivencraft.feature.red_shrubs.description": "Add red shrub patches to surface terrain with suitable ground.",
   "symbol.rivencraft.feature.abandoned_camps": "Abandoned Camps",
   "symbol.rivencraft.feature.abandoned_camps.description": "Allow abandoned camps on surface noise terrain, including outside their usual biomes.",
-  "symbol.rivencraft.block.generated.description": "Place immediately before a compatible feature; unpaired materials are not yet supported.",
+  "symbol.rivencraft.block.generated.description": "Modify the next compatible feature. Without a following feature, choose a compatible feature from the Age seed.",
   "symbol.rivencraft.biome.native.description": "Use the terrain's native biome source; do not include Biome pages.",
+  "symbol.rivencraft.feature.dungeons.description": "Add monster-room dungeon attempts throughout surface noise or Cave terrain, including Nether cave biomes. Not Flat or Void.",
+  "symbol.rivencraft.biome.single.description": "Use one biome across the Age. If omitted, choose an eligible biome from the Age seed.",
   "symbol.rivencraft.terrain.flat.description": "A level, biome-decorated landscape with its foundation at Y=0.",
   "symbol.rivencraft.feature.floating_islands.description": "Add high floating islands alongside noise, Flat, or Void terrain; not Cave terrain.",
   "symbol.rivencraft.feature.caves.description": "Add extra cave carving to noise terrain, including Cave; not Flat or Void.",

ports/mc263/src/main/java/net/dnorberg/rivencraft/age/AgeCatalogPayload.java

@@ -1,6 +1,8 @@
 package net.dnorberg.rivencraft.age;
 
 import java.util.List;
+import java.util.Map;
+import java.util.HashMap;
 import net.dnorberg.rivencraft.Rivencraft;
 import net.minecraft.network.RegistryFriendlyByteBuf;
 import net.minecraft.network.codec.ByteBufCodecs;
@@ -9,17 +11,23 @@ import net.minecraft.network.protocol.common.custom.CustomPacketPayload;
 import net.minecraft.resources.Identifier;
 
 /** Full server level catalog, sent on login and after a runtime Age is added. */
-public record AgeCatalogPayload(int version, List<Identifier> dimensions) implements CustomPacketPayload {
+public record AgeCatalogPayload(int version, List<Identifier> dimensions,
+                                Map<Identifier, PortAgeColors> colors,
+                                Map<Identifier, PortDayCycle> dayCycles) implements CustomPacketPayload {
     public static final Type<AgeCatalogPayload> TYPE = new Type<>(
             Identifier.fromNamespaceAndPath(Rivencraft.MOD_ID, "age_catalog"));
     public static final StreamCodec<RegistryFriendlyByteBuf, AgeCatalogPayload> STREAM_CODEC = StreamCodec.composite(
             ByteBufCodecs.VAR_INT, AgeCatalogPayload::version,
             Identifier.STREAM_CODEC.apply(ByteBufCodecs.list()), AgeCatalogPayload::dimensions,
+            ByteBufCodecs.map(HashMap::new, Identifier.STREAM_CODEC, PortAgeColors.STREAM_CODEC), AgeCatalogPayload::colors,
+            ByteBufCodecs.map(HashMap::new, Identifier.STREAM_CODEC, PortDayCycle.STREAM_CODEC), AgeCatalogPayload::dayCycles,
             AgeCatalogPayload::new
     );
 
     public AgeCatalogPayload {
         dimensions = List.copyOf(dimensions);
+        colors = Map.copyOf(colors);
+        dayCycles = Map.copyOf(dayCycles);
     }
 
     @Override

ports/mc263/src/main/java/net/dnorberg/rivencraft/age/AgeCatalogSync.java

@@ -21,7 +21,7 @@ public final class AgeCatalogSync {
     }
 
     public static void registerPayloads(RegisterPayloadHandlersEvent event) {
-        var registrar = event.registrar("1");
+        var registrar = event.registrar("10");
         registrar.playToClient(AgeCatalogPayload.TYPE, AgeCatalogPayload.STREAM_CODEC);
         registrar.playToServer(AgeCatalogAckPayload.TYPE, AgeCatalogAckPayload.STREAM_CODEC,
                 (payload, context) -> {
@@ -77,7 +77,8 @@ public final class AgeCatalogSync {
         State state = state(server);
         state.acknowledged.remove(player.getUUID());
         var dimensions = server.levelKeys().stream().map(key -> key.identifier()).sorted().toList();
-        PacketDistributor.sendToPlayer(player, new AgeCatalogPayload(state.version, dimensions));
+        PacketDistributor.sendToPlayer(player, new AgeCatalogPayload(state.version, dimensions,
+                RuntimeAgeBackend.savedColors(server), RuntimeAgeBackend.savedDayCycles(server)));
     }
 
     private static void acknowledge(ServerPlayer player, int version) {

ports/mc263/src/main/java/net/dnorberg/rivencraft/age/AgeLevelIndex.java

@@ -34,7 +34,15 @@ final class AgeLevelIndex extends SavedData {
             Codec.unboundedMap(Identifier.CODEC, PortLakePlan.CODEC)
                     .optionalFieldOf("lakes", Map.of()).forGetter(index -> index.lakes),
             Codec.unboundedMap(Identifier.CODEC, PortTerrainFeaturePlan.CODEC)
-                    .optionalFieldOf("terrain_features", Map.of()).forGetter(index -> index.terrainFeatures)
+                    .optionalFieldOf("terrain_features", Map.of()).forGetter(index -> index.terrainFeatures),
+            Codec.unboundedMap(Identifier.CODEC, PortLighting.CODEC)
+                    .optionalFieldOf("lighting", Map.of()).forGetter(index -> index.lighting),
+            Codec.unboundedMap(Identifier.CODEC, PortSkyStyle.CODEC)
+                    .optionalFieldOf("sky", Map.of()).forGetter(index -> index.sky),
+            Codec.unboundedMap(Identifier.CODEC, PortAgeColors.CODEC)
+                    .optionalFieldOf("colors", Map.of()).forGetter(index -> index.colors),
+            Codec.unboundedMap(Identifier.CODEC, PortDayCycle.CODEC)
+                    .optionalFieldOf("day_cycles", Map.of()).forGetter(index -> index.dayCycles)
     ).apply(instance, AgeLevelIndex::new));
 
     static final SavedDataType<AgeLevelIndex> TYPE = new SavedDataType<>(
@@ -53,6 +61,10 @@ final class AgeLevelIndex extends SavedData {
     private final Map<Identifier, Integer> dungeons;
     private final Map<Identifier, PortLakePlan> lakes;
     private final Map<Identifier, PortTerrainFeaturePlan> terrainFeatures;
+    private final Map<Identifier, PortLighting> lighting;
+    private final Map<Identifier, PortSkyStyle> sky;
+    private final Map<Identifier, PortAgeColors> colors;
+    private final Map<Identifier, PortDayCycle> dayCycles;
 
     private AgeLevelIndex() {
         this.ages = new LinkedHashMap<>();
@@ -65,6 +77,10 @@ final class AgeLevelIndex extends SavedData {
         this.dungeons = new LinkedHashMap<>();
         this.lakes = new LinkedHashMap<>();
         this.terrainFeatures = new LinkedHashMap<>();
+        this.lighting = new LinkedHashMap<>();
+        this.sky = new LinkedHashMap<>();
+        this.colors = new LinkedHashMap<>();
+        this.dayCycles = new LinkedHashMap<>();
     }
 
     private AgeLevelIndex(Map<Identifier, Long> ages, List<Identifier> retired,
@@ -75,7 +91,10 @@ final class AgeLevelIndex extends SavedData {
                           Map<Identifier, PortVegetationPlan> vegetation,
                           Map<Identifier, Integer> dungeons,
                           Map<Identifier, PortLakePlan> lakes,
-                          Map<Identifier, PortTerrainFeaturePlan> terrainFeatures) {
+                          Map<Identifier, PortTerrainFeaturePlan> terrainFeatures,
+                          Map<Identifier, PortLighting> lighting,
+                          Map<Identifier, PortSkyStyle> sky, Map<Identifier, PortAgeColors> colors,
+                          Map<Identifier, PortDayCycle> dayCycles) {
         this.ages = new LinkedHashMap<>(ages);
         this.retired = new LinkedHashSet<>(retired);
         this.biomeOverrides = new LinkedHashMap<>(biomeOverrides);
@@ -86,6 +105,10 @@ final class AgeLevelIndex extends SavedData {
         this.dungeons = new LinkedHashMap<>(dungeons);
         this.lakes = new LinkedHashMap<>(lakes);
         this.terrainFeatures = new LinkedHashMap<>(terrainFeatures);
+        this.lighting = new LinkedHashMap<>(lighting);
+        this.sky = new LinkedHashMap<>(sky);
+        this.colors = new LinkedHashMap<>(colors);
+        this.dayCycles = new LinkedHashMap<>(dayCycles);
     }
 
     Map<Identifier, Long> entries() {
@@ -116,10 +139,17 @@ final class AgeLevelIndex extends SavedData {
     int dungeons(Identifier id) { return dungeons.getOrDefault(id, 0); }
     PortLakePlan lakes(Identifier id) { return lakes.get(id); }
     PortTerrainFeaturePlan terrainFeatures(Identifier id) { return terrainFeatures.get(id); }
+    PortLighting lighting(Identifier id) { return lighting.getOrDefault(id, PortLighting.NORMAL); }
+    PortSkyStyle sky(Identifier id) { return sky.getOrDefault(id, PortSkyStyle.OVERWORLD); }
+    PortAgeColors colors(Identifier id) { return colors.getOrDefault(id, PortAgeColors.NATIVE); }
+    Map<Identifier, PortAgeColors> colors() { return Map.copyOf(colors); }
+    PortDayCycle dayCycle(Identifier id) { return dayCycles.getOrDefault(id, PortDayCycle.NATIVE); }
+    Map<Identifier, PortDayCycle> dayCycles() { return Map.copyOf(dayCycles); }
 
     void add(Identifier id, long seed, PortBiomePlan biomePlan, PortAgeTerrain ageTerrain,
              PortRockPlan rockPlan, PortVegetationPlan vegetationPlan, int dungeonCount,
-             PortLakePlan lakePlan, PortTerrainFeaturePlan terrainFeaturePlan) {
+             PortLakePlan lakePlan, PortTerrainFeaturePlan terrainFeaturePlan, PortLighting light, PortSkyStyle skyStyle,
+             PortAgeColors colorProfile, PortDayCycle dayCycle) {
         if (contains(id)) {
             throw new IllegalArgumentException("Age already exists: " + id);
         }
@@ -131,6 +161,10 @@ final class AgeLevelIndex extends SavedData {
         if (dungeonCount > 0) dungeons.put(id, dungeonCount);
         if (lakePlan != null) lakes.put(id, lakePlan);
         if (terrainFeaturePlan != null) terrainFeatures.put(id, terrainFeaturePlan);
+        if (light != PortLighting.NORMAL) lighting.put(id, light);
+        if (skyStyle != PortSkyStyle.OVERWORLD) sky.put(id, skyStyle);
+        if (!colorProfile.equals(PortAgeColors.NATIVE)) colors.put(id, colorProfile);
+        if (!dayCycle.equals(PortDayCycle.NATIVE)) dayCycles.put(id, dayCycle);
         setDirty();
     }
 
@@ -144,6 +178,10 @@ final class AgeLevelIndex extends SavedData {
         dungeons.remove(id);
         lakes.remove(id);
         terrainFeatures.remove(id);
+        lighting.remove(id);
+        sky.remove(id);
+        colors.remove(id);
+        dayCycles.remove(id);
         retired.add(id);
         setDirty();
     }
@@ -151,7 +189,8 @@ final class AgeLevelIndex extends SavedData {
     void restoreAfterFailedRetirement(Identifier id, long seed, PortBiomePlan biomePlan,
                                       PortAgeTerrain ageTerrain, PortRockPlan rockPlan,
                                       PortVegetationPlan vegetationPlan, int dungeonCount,
-                                      PortLakePlan lakePlan, PortTerrainFeaturePlan terrainFeaturePlan) {
+                                      PortLakePlan lakePlan, PortTerrainFeaturePlan terrainFeaturePlan, PortLighting light,
+                                      PortSkyStyle skyStyle, PortAgeColors colorProfile, PortDayCycle dayCycle) {
         if (!retired.remove(id)) throw new IllegalStateException("Age is not retired: " + id);
         ages.put(id, seed);
         if (biomePlan != null) biomePlans.put(id, biomePlan);
@@ -161,6 +200,10 @@ final class AgeLevelIndex extends SavedData {
         if (dungeonCount > 0) dungeons.put(id, dungeonCount);
         if (lakePlan != null) lakes.put(id, lakePlan);
         if (terrainFeaturePlan != null) terrainFeatures.put(id, terrainFeaturePlan);
+        if (light != PortLighting.NORMAL) lighting.put(id, light);
+        if (skyStyle != PortSkyStyle.OVERWORLD) sky.put(id, skyStyle);
+        if (!colorProfile.equals(PortAgeColors.NATIVE)) colors.put(id, colorProfile);
+        if (!dayCycle.equals(PortDayCycle.NATIVE)) dayCycles.put(id, dayCycle);
         setDirty();
     }
 

ports/mc263/src/main/java/net/dnorberg/rivencraft/age/PortAgeColors.java

@@ -0,0 +1,132 @@
+package net.dnorberg.rivencraft.age;
+
+import com.mojang.serialization.Codec;
+import com.mojang.serialization.codecs.RecordCodecBuilder;
+import java.util.List;
+import java.util.Map;
+import java.util.Random;
+import net.minecraft.network.RegistryFriendlyByteBuf;
+import net.minecraft.network.codec.ByteBufCodecs;
+import net.minecraft.network.codec.StreamCodec;
+import net.minecraft.resources.Identifier;
+import net.minecraft.world.level.Level;
+import org.joml.Vector3f;
+import org.joml.Vector3fc;
+
+/** Frozen shared-color writing, adapted from 1.21.1 AgeSkyProfile. -1 means native. */
+public record PortAgeColors(int sky, int ambient, int celestial) {
+    public static final PortAgeColors NATIVE = new PortAgeColors(-1, -1);
+    public static final Codec<PortAgeColors> CODEC = RecordCodecBuilder.create(instance -> instance.group(
+            Codec.intRange(-1, 0xffffff).fieldOf("sky").forGetter(PortAgeColors::sky),
+            Codec.intRange(-1, 0xffffff).fieldOf("ambient").forGetter(PortAgeColors::ambient),
+            Codec.intRange(-1, 0xffffff).optionalFieldOf("celestial", -1).forGetter(PortAgeColors::celestial)
+    ).apply(instance, PortAgeColors::new));
+    public static final StreamCodec<RegistryFriendlyByteBuf, PortAgeColors> STREAM_CODEC = StreamCodec.composite(
+            ByteBufCodecs.INT, PortAgeColors::sky, ByteBufCodecs.INT, PortAgeColors::ambient,
+            ByteBufCodecs.INT, PortAgeColors::celestial, PortAgeColors::new);
+    public static final Identifier AMBIENT = Identifier.fromNamespaceAndPath("rivencraft", "lighting/ambient_color");
+    private static volatile Map<Identifier, PortAgeColors> clientColors = Map.of();
+
+    public PortAgeColors {
+        if (sky < -1 || sky > 0xffffff || ambient < -1 || ambient > 0xffffff
+                || celestial < -1 || celestial > 0xffffff)
+            throw new IllegalArgumentException("Invalid Age color");
+    }
+
+    public PortAgeColors(int sky, int ambient) { this(sky, ambient, -1); }
+
+    public static void updateClient(Map<Identifier, PortAgeColors> colors) { clientColors = Map.copyOf(colors); }
+
+    public static PortAgeColors forLevel(Level level) {
+        if (level instanceof PortAgeLevel age) return age.colors();
+        return level.isClientSide() ? clientColors.getOrDefault(level.dimension().identifier(), NATIVE) : NATIVE;
+    }
+
+    public static boolean isColor(Identifier page) {
+        return page.getNamespace().equals("rivencraft") && switch (page.getPath()) {
+            case "color/red", "color/green", "color/blue", "color/white", "color/black" -> true;
+            default -> false;
+        };
+    }
+
+    public static int number(Identifier page) {
+        if (!page.getNamespace().equals("rivencraft") || !page.getPath().startsWith("number/")) return -1;
+        try {
+            int value = Integer.parseInt(page.getPath().substring(7));
+            return value >= 0 && value <= 24 ? value : -1;
+        } catch (NumberFormatException exception) { return -1; }
+    }
+
+    public static boolean isModifier(Identifier page) { return isColor(page) || number(page) >= 0 || page.equals(AMBIENT); }
+
+    public static boolean validNumbers(List<Identifier> pages) {
+        for (int i = 0; i < pages.size(); i++)
+            if (number(pages.get(i)) >= 0 && (i + 1 == pages.size()
+                    || !isColor(pages.get(i + 1)) && !PortDayCycle.isPeriod(pages.get(i + 1))
+                    && !PortDayCycle.isPhase(pages.get(i + 1)) && !PortDayCycle.isAngle(pages.get(i + 1))
+                    && !PortDayCycle.isSize(pages.get(i + 1)))) return false;
+        return true;
+    }
+
+    public static PortAgeColors compile(List<Identifier> pages, long seed) {
+        if (!validNumbers(pages)) throw new IllegalArgumentException("Number pages must precede a supported Color, Length, Phase, Angle, or Size modifier");
+        int red = 0, green = 0, blue = 0, sky = -1, ambient = -1, celestial = -1;
+        boolean written = false;
+        for (int i = 0; i < pages.size(); i++) {
+            Identifier page = pages.get(i);
+            if (isColor(page)) {
+                int amount = i > 0 ? number(pages.get(i - 1)) : -1;
+                if (amount < 0) amount = new Random(seed ^ (0x9E3779B97F4A7C15L * (i + 1L))).nextInt(25);
+                amount *= 10;
+                written = true;
+                switch (page.getPath()) {
+                    case "color/red" -> red += amount;
+                    case "color/green" -> green += amount;
+                    case "color/blue" -> blue += amount;
+                    case "color/white" -> { red += amount; green += amount; blue += amount; }
+                    case "color/black" -> { red -= amount; green -= amount; blue -= amount; }
+                }
+            } else if (PortSkyStyle.forPage(page) != null || page.equals(AMBIENT)
+                    || PortDayCycle.isController(page)) {
+                if (PortDayCycle.isController(page)) celestial = -1;
+                if (written) {
+                    int rgb = clamp(red) << 16 | clamp(green) << 8 | clamp(blue);
+                    if (page.equals(AMBIENT)) ambient = rgb;
+                    else if (PortDayCycle.isController(page)) celestial = rgb;
+                    else sky = rgb;
+                }
+                red = green = blue = 0;
+                written = false;
+            }
+        }
+        if (written) sky = clamp(red) << 16 | clamp(green) << 8 | clamp(blue);
+        return new PortAgeColors(sky, ambient, celestial);
+    }
+
+    /** Only pageless random Ages receive a random sky tint, as in 1.21.1. */
+    public static PortAgeColors resolve(List<Identifier> pages, long seed) {
+        if (!pages.isEmpty()) return compile(pages, seed);
+        var random = new Random(seed ^ 0x534B5950524F464CL);
+        random.nextInt(5); // Root sky-style draw precedes the sky-color draw.
+        return new PortAgeColors(randomColor(random, true), -1);
+    }
+
+    /** Shared palette; retain .85's truncation for already-defined body defaults. */
+    static int randomColor(Random random, boolean rounded) {
+        int[] palette = {0xB74A50, 0xD9834B, 0xDBC574, 0x5AAB80, 0x6FA8DF, 0x9870B9, 0xD5DBE1, 0x252531};
+        int count = 1 + random.nextInt(3), red = 0, green = 0, blue = 0;
+        for (int i = 0; i < count; i++) {
+            int color = palette[random.nextInt(palette.length)];
+            red += color >> 16 & 255;
+            green += color >> 8 & 255;
+            blue += color & 255;
+        }
+        int offset = rounded ? count / 2 : 0;
+        return (red + offset) / count << 16 | (green + offset) / count << 8 | (blue + offset) / count;
+    }
+
+    private static int clamp(int value) { return Math.max(0, Math.min(255, value)); }
+    public static Vector3fc vector(int rgb) {
+        return new Vector3f((rgb >> 16 & 255) / 255f, (rgb >> 8 & 255) / 255f, (rgb & 255) / 255f);
+    }
+}

ports/mc263/src/main/java/net/dnorberg/rivencraft/age/PortAgeLevel.java

@@ -14,6 +14,21 @@ final class PortAgeLevel extends ServerLevel {
     private final WeatherData ageWeather;
     private final PortWeatherSettings weatherSettings;
     private final boolean cave;
+    private PortAgeColors colors = PortAgeColors.NATIVE;
+    private PortDayCycle dayCycle = PortDayCycle.NATIVE;
+
+    PortDayCycle dayCycle() { return dayCycle == null ? PortDayCycle.NATIVE : dayCycle; }
+    void configureDayCycle(PortDayCycle cycle) {
+        this.dayCycle = cycle;
+        environmentAttributes().invalidateTickCache();
+        updateSkyBrightness();
+    }
+
+    PortAgeColors colors() { return colors == null ? PortAgeColors.NATIVE : colors; }
+    void configureColors(PortAgeColors colors) {
+        this.colors = colors;
+        environmentAttributes().invalidateTickCache();
+    }
 
     PortAgeLevel(MinecraftServer server, ResourceKey<Level> key, LevelStem stem,
                  long biomeZoomSeed, PortAgeTerrain terrain) {

ports/mc263/src/main/java/net/dnorberg/rivencraft/age/PortBiomeMaterialRules.java

@@ -0,0 +1,31 @@
+package net.dnorberg.rivencraft.age;
+
+import net.minecraft.core.Holder;
+import net.minecraft.core.HolderLookup;
+import net.minecraft.core.registries.Registries;
+import net.minecraft.data.worldgen.material.EndMaterialRules;
+import net.minecraft.data.worldgen.material.NetherMaterialRules;
+import net.minecraft.world.level.biome.Biomes;
+import net.minecraft.world.level.levelgen.NoiseGeneratorSettings;
+import net.minecraft.world.level.levelgen.material.MaterialRules;
+
+/** Root AgeDimensionService.withBiomeMaterialRules adapted to 26.3's rule registry. */
+final class PortBiomeMaterialRules {
+    private PortBiomeMaterialRules() {}
+
+    static Holder<NoiseGeneratorSettings> apply(HolderLookup.Provider registries, NoiseGeneratorSettings base) {
+        var biomes = registries.lookupOrThrow(Registries.BIOME);
+        var rules = registries.lookupOrThrow(Registries.MATERIAL_RULE);
+        var materials = MaterialRules.sequence(
+                MaterialRules.ifTrue(MaterialRules.isBiome(biomes, Biomes.THE_END, Biomes.END_HIGHLANDS,
+                        Biomes.END_MIDLANDS, Biomes.SMALL_END_ISLANDS, Biomes.END_BARRENS),
+                        MaterialRules.getRule(rules, EndMaterialRules.END)),
+                MaterialRules.ifTrue(MaterialRules.isBiome(biomes, Biomes.NETHER_WASTES, Biomes.SOUL_SAND_VALLEY,
+                        Biomes.CRIMSON_FOREST, Biomes.WARPED_FOREST, Biomes.BASALT_DELTAS),
+                        MaterialRules.getRule(rules, NetherMaterialRules.NETHER)),
+                base.materialRule().value());
+        return Holder.direct(new NoiseGeneratorSettings(base.noiseSettings(), base.defaultBlock(), base.defaultFluid(),
+                base.noiseRouter(), Holder.direct(materials), base.spawnTarget(), base.seaLevel(), base.disableMobGeneration(),
+                base.aquifers(), base.useLegacyRandomSource(), base.debugFunctions()));
+    }
+}

ports/mc263/src/main/java/net/dnorberg/rivencraft/age/PortCelestialBody.java

@@ -0,0 +1,96 @@
+package net.dnorberg.rivencraft.age;
+
+import com.mojang.serialization.Codec;
+import com.mojang.serialization.codecs.RecordCodecBuilder;
+import net.minecraft.network.RegistryFriendlyByteBuf;
+import net.minecraft.network.codec.ByteBufCodecs;
+import net.minecraft.network.codec.StreamCodec;
+
+/** One frozen authored orbit, using the same angular motion as 1.21.1 Body. */
+public record PortCelestialBody(int kind, double period, int stoppedTime, long originTick,
+                                int phaseTick, boolean clockwise, int bearing, float size, int color) {
+    public static final Codec<PortCelestialBody> CODEC = RecordCodecBuilder.create(instance -> instance.group(
+            Codec.intRange(1, 2).fieldOf("kind").forGetter(PortCelestialBody::kind),
+            Codec.doubleRange(0, 2).fieldOf("period").forGetter(PortCelestialBody::period),
+            Codec.intRange(0, 23999).fieldOf("stopped_time").forGetter(PortCelestialBody::stoppedTime),
+            Codec.LONG.fieldOf("origin_tick").forGetter(PortCelestialBody::originTick),
+            Codec.intRange(0, 23999).fieldOf("phase_tick").forGetter(PortCelestialBody::phaseTick),
+            Codec.BOOL.fieldOf("clockwise").forGetter(PortCelestialBody::clockwise),
+            Codec.intRange(-1, 359).fieldOf("bearing").forGetter(PortCelestialBody::bearing),
+            Codec.floatRange(0.25F, 3F).fieldOf("size").forGetter(PortCelestialBody::size),
+            Codec.intRange(-1, 0xffffff).fieldOf("color").forGetter(PortCelestialBody::color)
+    ).apply(instance, PortCelestialBody::new));
+    public static final StreamCodec<RegistryFriendlyByteBuf, PortCelestialBody> STREAM_CODEC = StreamCodec.composite(
+            ByteBufCodecs.VAR_INT, PortCelestialBody::kind, ByteBufCodecs.DOUBLE, PortCelestialBody::period,
+            ByteBufCodecs.VAR_INT, PortCelestialBody::stoppedTime, ByteBufCodecs.VAR_LONG, PortCelestialBody::originTick,
+            ByteBufCodecs.VAR_INT, PortCelestialBody::phaseTick, ByteBufCodecs.BOOL, PortCelestialBody::clockwise,
+            ByteBufCodecs.INT, PortCelestialBody::bearing, ByteBufCodecs.FLOAT, PortCelestialBody::size,
+            ByteBufCodecs.INT, PortCelestialBody::color, PortCelestialBody::new);
+
+    public PortCelestialBody {
+        if (kind != PortDayCycle.SUN && kind != PortDayCycle.MOON || !Double.isFinite(period)
+                || period < 0 || period > 2 || stoppedTime < 0 || stoppedTime >= 24000
+                || phaseTick < 0 || phaseTick >= 24000 || bearing < -1 || bearing > 359
+                || !Float.isFinite(size) || size < 0.25F || size > 3 || color < -1 || color > 0xffffff)
+            throw new IllegalArgumentException("Invalid celestial body");
+    }
+
+    public static PortCelestialBody of(PortDayCycle cycle, int kind, int color, boolean pairedMoon) {
+        int offset = pairedMoon ? 12000 : 0;
+        return new PortCelestialBody(kind, cycle.period(), (cycle.stoppedTime() + offset) % 24000,
+                cycle.originTick(), (cycle.phaseTick() + offset) % 24000, cycle.clockwise(),
+                cycle.bearing(), pairedMoon ? 1F : cycle.sunSize(), color);
+    }
+
+    public float angle(double nativeTicks) {
+        double time = period == 0 ? stoppedTime
+                : (clockwise ? 1 : -1) * (nativeTicks - originTick) / period + phaseTick;
+        return (float) (((time - 6000D) % 24000D) * (360D / 24000D));
+    }
+
+    public float light(long nativeTicks) {
+        return Math.max(0F, (float) Math.cos(Math.toRadians(angle(nativeTicks))))
+                * (kind == PortDayCycle.MOON ? 0.18F : 1F);
+    }
+
+    public net.minecraft.world.phys.Vec3 direction(double ticks) {
+        double orbit = Math.toRadians(angle(ticks)), axis = Math.toRadians(bearing < 0 ? -90 : bearing);
+        double lateral = Math.sin(orbit);
+        return new net.minecraft.world.phys.Vec3(Math.sin(axis) * lateral, Math.cos(orbit), Math.cos(axis) * lateral);
+    }
+
+    /** Root AgeSkyProfile.eclipseFor: contact uses the central quarter-size disc, not its halo. */
+    public float eclipse(java.util.List<PortCelestialBody> bodies, double ticks) {
+        float strongest = 0;
+        var direction = direction(ticks);
+        double radius = Math.atan((kind == PortDayCycle.SUN ? 30D : 20D) * size * 0.25D / 100D);
+        for (var other : bodies) {
+            if (other.kind == kind) continue;
+            double separation = Math.acos(Math.max(-1D, Math.min(1D, direction.dot(other.direction(ticks)))));
+            double contact = radius + Math.atan((other.kind == PortDayCycle.SUN ? 30D : 20D) * other.size * 0.25D / 100D);
+            strongest = Math.max(strongest, (float) Math.max(0D, 1D - separation / contact));
+        }
+        return strongest;
+    }
+
+    public static float eclipseAt(java.util.List<PortCelestialBody> bodies, double ticks) {
+        float strongest = 0;
+        for (var body : bodies) if (body.kind == PortDayCycle.SUN && body.direction(ticks).y > 0D)
+            strongest = Math.max(strongest, body.eclipse(bodies, ticks));
+        return strongest;
+    }
+
+    /** Shared client/server-checkable RGB rule; alpha is handled by the renderer. */
+    public int eclipseColor(float eclipse) {
+        int rgb = color < 0 ? 0xffffff : color;
+        float corona = kind == PortDayCycle.SUN ? (float) Math.pow(eclipse, 8D) * 0.8F : 0F;
+        int red = channel(rgb >> 16 & 255, eclipse, corona);
+        int green = channel(rgb >> 8 & 255, eclipse, corona);
+        int blue = channel(rgb & 255, eclipse, corona);
+        return red << 16 | green << 8 | blue;
+    }
+
+    private int channel(int value, float eclipse, float corona) {
+        return Math.round(kind == PortDayCycle.MOON ? value * (1F - eclipse) : value + (255 - value) * corona);
+    }
+}

ports/mc263/src/main/java/net/dnorberg/rivencraft/age/PortDayCycle.java

@@ -0,0 +1,342 @@
+package net.dnorberg.rivencraft.age;
+
+import com.mojang.serialization.Codec;
+import com.mojang.serialization.codecs.RecordCodecBuilder;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Random;
+import net.minecraft.core.Holder;
+import net.minecraft.network.RegistryFriendlyByteBuf;
+import net.minecraft.network.codec.ByteBufCodecs;
+import net.minecraft.network.codec.StreamCodec;
+import net.minecraft.resources.Identifier;
+import net.minecraft.world.clock.ClockInstance;
+import net.minecraft.world.clock.ClockManager;
+import net.minecraft.world.clock.WorldClock;
+import net.minecraft.world.clock.WorldClocks;
+import net.minecraft.world.level.Level;
+
+/** Authored native celestial controls. Never mutates the shared clock. */
+public record PortDayCycle(boolean authored, double period, int stoppedTime,
+                           long originTick, int phaseTick, boolean clockwise, int bearing, float sunSize, int bodyMode,
+                           List<PortCelestialBody> bodies) {
+    public static final int PAIRED = 0, SUN = 1, MOON = 2, NONE = 3;
+    public static final PortDayCycle NATIVE = new PortDayCycle(false, 1, 0);
+    public static final Identifier NORMAL_TIME = Identifier.fromNamespaceAndPath("rivencraft", "celestial/normal_time");
+    public static final Codec<PortDayCycle> CODEC = RecordCodecBuilder.create(instance -> instance.group(
+            Codec.BOOL.fieldOf("authored").forGetter(PortDayCycle::authored),
+            Codec.doubleRange(0, 2).fieldOf("period").forGetter(PortDayCycle::period),
+            Codec.intRange(0, 23999).fieldOf("stopped_time").forGetter(PortDayCycle::stoppedTime),
+            Codec.LONG.optionalFieldOf("origin_tick", 0L).forGetter(PortDayCycle::originTick),
+            Codec.intRange(0, 23999).optionalFieldOf("phase_tick", 0).forGetter(PortDayCycle::phaseTick),
+            Codec.BOOL.optionalFieldOf("clockwise", true).forGetter(PortDayCycle::clockwise),
+            Codec.intRange(-1, 359).optionalFieldOf("bearing", -1).forGetter(PortDayCycle::bearing),
+            Codec.floatRange(0.25F, 3F).optionalFieldOf("sun_size", 1F).forGetter(PortDayCycle::sunSize),
+            Codec.intRange(0, 3).optionalFieldOf("body_mode", PAIRED).forGetter(PortDayCycle::bodyMode),
+            PortCelestialBody.CODEC.listOf().optionalFieldOf("bodies", List.of()).forGetter(PortDayCycle::bodies)
+    ).apply(instance, PortDayCycle::new));
+    public static final StreamCodec<RegistryFriendlyByteBuf, PortDayCycle> STREAM_CODEC = StreamCodec.composite(
+            ByteBufCodecs.BOOL, PortDayCycle::authored, ByteBufCodecs.DOUBLE, PortDayCycle::period,
+            ByteBufCodecs.VAR_INT, PortDayCycle::stoppedTime, ByteBufCodecs.VAR_LONG, PortDayCycle::originTick,
+            ByteBufCodecs.VAR_INT, PortDayCycle::phaseTick, ByteBufCodecs.BOOL, PortDayCycle::clockwise,
+            ByteBufCodecs.INT, PortDayCycle::bearing, ByteBufCodecs.FLOAT, PortDayCycle::sunSize,
+            ByteBufCodecs.VAR_INT, PortDayCycle::bodyMode,
+            PortCelestialBody.STREAM_CODEC.apply(ByteBufCodecs.list()), PortDayCycle::bodies, PortDayCycle::new);
+    private static volatile Map<Identifier, PortDayCycle> clientCycles = Map.of();
+
+    public PortDayCycle {
+        bodies = List.copyOf(bodies);
+        if (!Double.isFinite(period) || period < 0 || period > 2 || stoppedTime < 0 || stoppedTime >= 24000
+                || phaseTick < 0 || phaseTick >= 24000 || bearing < -1 || bearing >= 360
+                || !Float.isFinite(sunSize) || sunSize < 0.25F || sunSize > 3F
+                || bodyMode < PAIRED || bodyMode > NONE
+                || bodyMode == NONE && (!authored || !bodies.isEmpty()))
+            throw new IllegalArgumentException("Invalid day cycle");
+        if (bodies.stream().filter(body -> body.kind() == SUN).count() > 10
+                || bodies.stream().filter(body -> body.kind() == MOON).count() > 10)
+            throw new IllegalArgumentException("An Age may have at most ten suns and ten moons");
+    }
+
+    public PortDayCycle(boolean authored, double period, int stoppedTime,
+                        long originTick, int phaseTick, boolean clockwise, int bearing, float sunSize, int bodyMode) {
+        this(authored, period, stoppedTime, originTick, phaseTick, clockwise, bearing, sunSize, bodyMode, List.of());
+    }
+
+    public PortDayCycle(boolean authored, double period, int stoppedTime,
+                        long originTick, int phaseTick, boolean clockwise, int bearing, float sunSize) {
+        this(authored, period, stoppedTime, originTick, phaseTick, clockwise, bearing, sunSize, PAIRED);
+    }
+
+    public PortDayCycle(boolean authored, double period, int stoppedTime) {
+        this(authored, period, stoppedTime, 0, 0, true);
+    }
+
+    public PortDayCycle(boolean authored, double period, int stoppedTime,
+                        long originTick, int phaseTick, boolean clockwise) {
+        this(authored, period, stoppedTime, originTick, phaseTick, clockwise, -1);
+    }
+
+    public PortDayCycle(boolean authored, double period, int stoppedTime,
+                        long originTick, int phaseTick, boolean clockwise, int bearing) {
+        this(authored, period, stoppedTime, originTick, phaseTick, clockwise, bearing, 1F);
+    }
+
+    public static boolean isPeriod(Identifier page) {
+        return page.getNamespace().equals("rivencraft") && switch (page.getPath()) {
+            case "period/full", "period/half", "period/double", "period/zero" -> true;
+            default -> false;
+        };
+    }
+
+    public static boolean isPhase(Identifier page) {
+        return page.getNamespace().equals("rivencraft") && switch (page.getPath()) {
+            case "phase/rising", "phase/zenith", "phase/setting", "phase/nadir" -> true;
+            default -> false;
+        };
+    }
+
+    public static boolean isDirection(Identifier page) {
+        return page.getNamespace().equals("rivencraft") && (page.getPath().equals("direction/clockwise")
+                || page.getPath().equals("direction/counterclockwise"));
+    }
+
+    public static boolean isAngle(Identifier page) {
+        return page.getNamespace().equals("rivencraft") && switch (page.getPath()) {
+            case "angle/north", "angle/east", "angle/south", "angle/west" -> true;
+            default -> false;
+        };
+    }
+
+    public static boolean supports(Identifier page) {
+        return isController(page) || isPeriod(page) || isPhase(page) || isDirection(page) || isAngle(page) || isSize(page);
+    }
+
+    public static boolean isController(Identifier page) {
+        return page.getNamespace().equals("rivencraft") && switch (page.getPath()) {
+            case "celestial/normal_time", "celestial/sun", "celestial/moon" -> true;
+            default -> false;
+        };
+    }
+
+    public static boolean isSize(Identifier page) {
+        return page.getNamespace().equals("rivencraft") && switch (page.getPath()) {
+            case "size/small", "size/normal", "size/large" -> true;
+            default -> false;
+        };
+    }
+
+    public static boolean validWriting(List<Identifier> pages) {
+        int periods = 0, phases = 0, directions = 0, angles = 0, sizes = 0, suns = 0, moons = 0;
+        for (Identifier page : pages) {
+            if (isPeriod(page) && ++periods > 1 || isPhase(page) && ++phases > 1
+                    || isDirection(page) && ++directions > 1 || isAngle(page) && ++angles > 1
+                    || isSize(page) && ++sizes > 1) return false;
+            if (isController(page)) {
+                if (!page.getPath().equals("celestial/moon")) suns++;
+                if (!page.getPath().equals("celestial/sun")) moons++;
+                if (suns > 10 || moons > 10) return false;
+                periods = phases = directions = angles = sizes = 0;
+            }
+        }
+        return periods + phases + directions + angles + sizes == 0;
+    }
+
+    public static PortDayCycle compile(List<Identifier> pages, long seed) {
+        return compile(pages, seed, 0);
+    }
+
+    /** Creation-only completion. Exact diagnostic fixtures can still use compile. */
+    public static PortDayCycle resolve(List<Identifier> pages, long seed, long nativeTicks) {
+        if (!validWriting(pages) || !PortAgeColors.validNumbers(pages))
+            throw new IllegalArgumentException("Invalid celestial modifier order");
+        if (pages.stream().anyMatch(PortDayCycle::isController)) return compile(pages, seed, nativeTicks);
+        // Match root AgeSkyProfile.random's count draw positions: sky style,
+        // mixed sky color, then independent 0..3 sun and moon counts.
+        var random = new Random(seed ^ 0x534B5950524F464CL);
+        random.nextInt(5);
+        randomColor(random);
+        int suns = random.nextInt(4), moons = random.nextInt(4);
+        var bodies = new java.util.ArrayList<PortCelestialBody>();
+        for (int i = 0; i < suns + moons; i++)
+            bodies.addAll(randomUnmodified(seed, i, nativeTicks, i < suns ? SUN : MOON).bodies);
+        if (bodies.isEmpty()) return new PortDayCycle(true, 1, 0, 0, 0, true, -1, 1F, NONE);
+        var first = bodies.getFirst();
+        return new PortDayCycle(true, first.period(), first.stoppedTime(), first.originTick(), first.phaseTick(),
+                first.clockwise(), first.bearing(), first.size(), first.kind(), bodies);
+    }
+
+    public static PortDayCycle compile(List<Identifier> pages, long seed, long nativeTicks) {
+        if (!validWriting(pages)) throw new IllegalArgumentException("Place at most one of each celestial modifier before its controller; limit ten suns and ten moons");
+        if (pages.stream().filter(PortDayCycle::isController).count() <= 1)
+            return compileOne(pages, seed, nativeTicks, 0);
+        var bodies = new java.util.ArrayList<PortCelestialBody>();
+        PortDayCycle first = null;
+        int start = 0, ordinal = 0;
+        for (int i = 0; i < pages.size(); i++) if (isController(pages.get(i))) {
+            var cycle = compileOne(pages.subList(start, i + 1), seed, nativeTicks, ordinal++);
+            if (first == null) first = cycle;
+            // Prefix retains original page indices for seeded unnumbered colors.
+            int color = PortAgeColors.compile(pages.subList(0, i + 1), seed).celestial();
+            if (!cycle.bodies.isEmpty()) bodies.addAll(cycle.bodies);
+            else {
+                if (cycle.bodyMode != MOON) bodies.add(PortCelestialBody.of(cycle, SUN, color, false));
+                if (cycle.bodyMode != SUN) bodies.add(PortCelestialBody.of(cycle, MOON, color, cycle.bodyMode == PAIRED));
+            }
+            start = i + 1;
+        }
+        return new PortDayCycle(first.authored, first.period, first.stoppedTime, first.originTick,
+                first.phaseTick, first.clockwise, first.bearing, first.sunSize, first.bodyMode, bodies);
+    }
+
+    private static PortDayCycle compileOne(List<Identifier> pages, long seed, long nativeTicks, int ordinal) {
+        var controller = pages.stream().filter(PortDayCycle::isController).findFirst().orElse(null);
+        if (controller == null) return NATIVE;
+        int mode = controller.getPath().equals("celestial/sun") ? SUN
+                : controller.getPath().equals("celestial/moon") ? MOON : PAIRED;
+        if (mode != PAIRED && !hasBodyModifiers(pages)) return randomUnmodified(seed, ordinal, nativeTicks, mode);
+        double period = 1;
+        Integer phase = null;
+        boolean clockwise = true;
+        int bearing = -1;
+        float size = 1F;
+        for (int i = 0; i < pages.size(); i++) {
+            Identifier page = pages.get(i);
+            int number = i > 0 ? PortAgeColors.number(pages.get(i - 1)) : -1;
+            if (isPhase(page)) {
+                int degrees = number >= 0 ? number * 15 % 360 : switch (page.getPath()) {
+                    case "phase/rising" -> 90;
+                    case "phase/zenith" -> 180;
+                    case "phase/setting" -> 270;
+                    default -> 0;
+                };
+                // Same conversion as 1.21.1 AgeDimensionService.applyInitialCelestialPhase:
+                // the written angle starts at Nadir, while native time zero is sunrise.
+                phase = (degrees * 24000 / 360 + 18000) % 24000;
+            } else if (isAngle(page)) {
+                bearing = number >= 0 ? number * 15 % 360 : switch (page.getPath()) {
+                    case "angle/east" -> 90;
+                    case "angle/south" -> 180;
+                    case "angle/west" -> 270;
+                    default -> 0;
+                };
+            } else if (isSize(page)) {
+                size = number >= 0 ? (float) (0.25D + number * (2.75D / 24D)) : switch (page.getPath()) {
+                    case "size/small" -> 0.5F;
+                    case "size/large" -> 2F;
+                    default -> 1F;
+                };
+            } else if (isDirection(page)) {
+                clockwise = page.getPath().equals("direction/clockwise");
+            } else if (isPeriod(page)) period = number >= 0 ? number * 0.08 : switch (page.getPath()) {
+                case "period/half" -> 0.5;
+                case "period/double" -> 2;
+                case "period/zero" -> 0;
+                default -> 1;
+            };
+        }
+        int stopped = period == 0 ? phase != null ? phase
+                : new Random(seed ^ 0x4441594359434C45L).nextInt(24000) : 0;
+        return new PortDayCycle(true, period, stopped, phase != null ? nativeTicks : 0,
+                phase == null ? 0 : phase, clockwise, bearing, size, mode);
+    }
+
+    private static boolean hasBodyModifiers(List<Identifier> pages) {
+        boolean color = false, controls = false;
+        for (var page : pages) {
+            if (isController(page)) return controls || color;
+            if (PortAgeColors.isColor(page)) color = true;
+            else if (PortSkyStyle.forPage(page) != null || page.equals(PortAgeColors.AMBIENT)) color = false;
+            if (isPeriod(page) || isPhase(page) || isDirection(page) || isAngle(page) || isSize(page)) controls = true;
+        }
+        return false;
+    }
+
+    private static PortDayCycle randomUnmodified(long seed, int ordinal, long nativeTicks, int mode) {
+        // Independent per-controller stream: unrelated terrain/sky/weather pages
+        // cannot reshuffle the bodies. Use root random-Age bounds, not native defaults.
+        var random = new Random(seed ^ 0x43454C4553544941L ^ (ordinal + 1L) * 0x9E3779B97F4A7C15L);
+        double period = random.nextInt(7) == 0 ? 0D : 0.2D + random.nextDouble() * 1.8D;
+        int phase = random.nextInt(24000), bearing = random.nextInt(360);
+        float size = 0.75F + random.nextFloat();
+        boolean clockwise = random.nextBoolean();
+        int color = randomColor(random);
+        var cycle = new PortDayCycle(true, period, period == 0 ? phase : 0, nativeTicks,
+                phase, clockwise, bearing, size, mode);
+        return new PortDayCycle(true, period, cycle.stoppedTime, nativeTicks, phase, clockwise, bearing, size,
+                mode, List.of(PortCelestialBody.of(cycle, mode, color, false)));
+    }
+
+    private static int randomColor(Random random) {
+        return PortAgeColors.randomColor(random, false);
+    }
+
+    public boolean singleBody() { return authored && (bodyMode == SUN || bodyMode == MOON); }
+    public boolean customLight() { return singleBody() || !bodies.isEmpty(); }
+
+    /** Linear authored orbit, as in 1.21.1 Body; zero degrees is Zenith. */
+    public float bodyAngle(long nativeTicks) {
+        return (float) (((time(nativeTicks) - 6000D) % 24000D) * (360D / 24000D));
+    }
+
+    public float bodyLight(long nativeTicks) {
+        if (bodyMode == NONE) return 0;
+        if (!bodies.isEmpty()) {
+            float sun = 0, moon = 0;
+            for (var body : bodies) {
+                if (body.kind() == SUN) sun += body.light(nativeTicks) * (1F - 0.85F * body.eclipse(bodies, nativeTicks));
+                else moon += body.light(nativeTicks);
+            }
+            return Math.min(1F, sun > 0 ? sun : moon);
+        }
+        float altitude = Math.max(0F, (float) Math.cos(Math.toRadians(bodyAngle(nativeTicks))));
+        return altitude * (bodyMode == MOON ? 0.18F : 1F);
+    }
+
+    public long ticks(long nativeTicks) {
+        if (!authored) return nativeTicks;
+        return (long) Math.floor(time(nativeTicks));
+    }
+
+    private double time(long nativeTicks) {
+        return !authored ? nativeTicks : period == 0 ? stoppedTime
+                : (clockwise ? 1 : -1) * ((double) nativeTicks - originTick) / period + phaseTick;
+    }
+
+    public static long nativeTicks(Level level) {
+        return level.clockManager().getInstance(level.registryAccess().lookupOrThrow(
+                net.minecraft.core.registries.Registries.WORLD_CLOCK).getOrThrow(WorldClocks.OVERWORLD)).totalTicks();
+    }
+
+    public static void updateClient(Map<Identifier, PortDayCycle> cycles) { clientCycles = Map.copyOf(cycles); }
+    public static PortDayCycle forLevel(Level level) {
+        if (level instanceof PortAgeLevel age) return age.dayCycle();
+        return level.isClientSide() ? clientCycles.getOrDefault(level.dimension().identifier(), NATIVE) : NATIVE;
+    }
+
+    /** Timelines keep this manager; profiles are read lazily after level construction/catalog sync. */
+    public static ClockManager timelines(Level level, ClockManager nativeManager) {
+        Map<Holder<WorldClock>, ClockInstance> wrappers = new HashMap<>();
+        return definition -> {
+            if (!definition.is(WorldClocks.OVERWORLD)) return nativeManager.getInstance(definition);
+            return wrappers.computeIfAbsent(definition, ignored -> new ClockInstance() {
+                private ClockInstance source() { return nativeManager.getInstance(definition); }
+                public long totalTicks() { return forLevel(level).ticks(source().totalTicks()); }
+                public float partialTick() {
+                    PortDayCycle cycle = forLevel(level);
+                    if (!cycle.authored) return source().partialTick();
+                    if (cycle.period == 0) return 0;
+                    double time = cycle.time(source().totalTicks());
+                    return (float) (time - Math.floor(time)
+                            + (cycle.clockwise ? 1 : -1) * source().partialTick() / cycle.period);
+                }
+                public float rate() {
+                    PortDayCycle cycle = forLevel(level);
+                    return !cycle.authored ? source().rate() : cycle.period == 0 ? 0
+                            : (float) ((cycle.clockwise ? 1 : -1) * source().rate() / cycle.period);
+                }
+                public boolean isPaused() { return source().isPaused() || forLevel(level).authored && forLevel(level).period == 0; }
+            });
+        };
+    }
+}

ports/mc263/src/main/java/net/dnorberg/rivencraft/age/PortEnvironmentSelection.java

@@ -0,0 +1,28 @@
+package net.dnorberg.rivencraft.age;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Random;
+import net.minecraft.resources.Identifier;
+
+/** Seed-completes missing environment controllers once, before an Age is saved. */
+public record PortEnvironmentSelection(PortWeatherMode weather, PortLighting lighting, PortSkyStyle sky) {
+    public static PortEnvironmentSelection resolve(List<Identifier> pages, long seed, PortAgeTerrain terrain) {
+        PortLighting lighting = pages.stream().map(PortLighting::forPage).filter(java.util.Objects::nonNull)
+                .findFirst().orElseGet(() -> rankedDefault(new Random(seed ^ 0x4C49474854494E47L), PortLighting.values()));
+        PortWeatherMode weather = terrain == PortAgeTerrain.CAVE ? PortWeatherMode.OFF
+                : pages.stream().map(PortWeatherMode::forPage).filter(java.util.Objects::nonNull)
+                        .findFirst().orElseGet(() -> rankedDefault(new Random(seed ^ 0x574541544845525FL), PortWeatherMode.values()));
+        return new PortEnvironmentSelection(weather, lighting, PortSkyStyle.resolve(pages, seed));
+    }
+
+    private static <T> T rankedDefault(Random random, T[] choices) {
+        // LegacyRankChoice: the first (Normal) option is rank 1, the rest rank 2.
+        // Its rank-1 weight is the complete rare group plus one. Derive this
+        // from the supported pool, rather than selecting unported weather.
+        int[] weights = new int[choices.length];
+        Arrays.fill(weights, 1);
+        weights[0] = choices.length;
+        return PortRandomAgeSelection.weighted(random, List.of(choices), weights);
+    }
+}

ports/mc263/src/main/java/net/dnorberg/rivencraft/age/PortFeatureChunkGenerator.java

@@ -113,7 +113,7 @@ public final class PortFeatureChunkGenerator extends ChunkGenerator {
     }
     @Override public ChunkGeneratorStructureState createState(HolderLookup<StructureSet> sets,
                                                                RandomState random, long seed) {
-        if (hasStructurePages()) {
+        if (controlsStructures()) {
             var lookup = PortStructurePages.filtered(sets, terrainFeatures.structures(), getBiomeSource());
             var planning = PortStructurePages.planningBiomes(getBiomeSource(), sets, terrainFeatures.structures());
             if (base instanceof PortFlatChunkGenerator || base instanceof net.minecraft.world.level.levelgen.FlatLevelSource)
@@ -124,13 +124,13 @@ public final class PortFeatureChunkGenerator extends ChunkGenerator {
         return base.createState(sets, random, seed);
     }
 
-    private boolean hasStructurePages() {
-        return terrainFeatures != null && !terrainFeatures.structures().isEmpty();
+    private boolean controlsStructures() {
+        return terrainFeatures != null && (terrainFeatures.structureControl() || !terrainFeatures.structures().isEmpty());
     }
     @Override public void createStructures(RegistryAccess registries, ChunkGeneratorStructureState state,
                                            StructureManager structures, ChunkAccess chunk,
                                            StructureTemplateManager templates, ResourceKey<Level> dimension) {
-        if (hasStructurePages()) super.createStructures(registries, state, structures, chunk, templates, dimension);
+        if (controlsStructures()) super.createStructures(registries, state, structures, chunk, templates, dimension);
         else base.createStructures(registries, state, structures, chunk, templates, dimension);
     }
     @Override public void createReferences(WorldGenLevel level, StructureManager structures, ChunkAccess chunk) {

ports/mc263/src/main/java/net/dnorberg/rivencraft/age/PortLighting.java

@@ -0,0 +1,52 @@
+package net.dnorberg.rivencraft.age;
+
+import com.mojang.serialization.Codec;
+import java.util.Locale;
+import net.dnorberg.rivencraft.Rivencraft;
+import net.minecraft.core.Holder;
+import net.minecraft.core.registries.Registries;
+import net.minecraft.resources.Identifier;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.world.level.dimension.DimensionType;
+import net.minecraft.world.level.Level;
+
+/** Authored lighting choices using statically registered, client-synchronized types. */
+public enum PortLighting {
+    NORMAL, DARK, BRIGHT;
+
+    public static final Codec<PortLighting> CODEC = Codec.STRING.xmap(
+            name -> valueOf(name.toUpperCase(Locale.ROOT)), mode -> mode.name().toLowerCase(Locale.ROOT));
+
+    public static PortLighting forPage(Identifier page) {
+        if (!page.getNamespace().equals(Rivencraft.MOD_ID)) return null;
+        return switch (page.getPath()) {
+            case "lighting/normal" -> NORMAL;
+            case "lighting/dark" -> DARK;
+            case "lighting/bright" -> BRIGHT;
+            default -> null;
+        };
+    }
+
+    public static boolean isBright(Level level) {
+        return level.dimensionTypeRegistration().unwrapKey().map(key -> {
+            Identifier id = key.identifier();
+            return id.getNamespace().equals(Rivencraft.MOD_ID)
+                    && (id.getPath().equals("age_bright") || id.getPath().equals("age_cave_bright")
+                        || id.getPath().startsWith("age_bright_sky_")
+                        || id.getPath().startsWith("age_cave_bright_sky_"));
+        }).orElse(false);
+    }
+
+    Holder<DimensionType> dimensionType(MinecraftServer server, PortAgeTerrain terrain,
+                                       Holder<DimensionType> overworldType, PortSkyStyle sky) {
+        boolean cave = terrain == PortAgeTerrain.CAVE;
+        if (this == NORMAL && !cave && sky == PortSkyStyle.OVERWORLD) return overworldType;
+        String variant = this == BRIGHT ? (cave ? "age_cave_bright" : "age_bright")
+                : this == DARK || cave ? "age_dark" : "age_normal";
+        if (sky != PortSkyStyle.OVERWORLD) variant += "_sky_" + sky.name().toLowerCase(Locale.ROOT);
+        return server.registryAccess().lookupOrThrow(Registries.DIMENSION_TYPE).getOrThrow(
+                ResourceKey.create(Registries.DIMENSION_TYPE,
+                        Identifier.fromNamespaceAndPath(Rivencraft.MOD_ID, variant)));
+    }
+}

ports/mc263/src/main/java/net/dnorberg/rivencraft/age/PortRandomAgeSelection.java

@@ -54,7 +54,8 @@ public final class PortRandomAgeSelection {
         return new Selection(terrain, new PortBiomePlan(distribution, shuffled.subList(0, count)));
     }
 
-    private static List<Identifier> eligibleBiomes(MinecraftServer server, PortAgeTerrain terrain) {
+    public static List<Identifier> eligibleBiomes(MinecraftServer server, PortAgeTerrain terrain) {
+        if (terrain == PortAgeTerrain.VOID) return List.of(Identifier.withDefaultNamespace("the_void"));
         if (terrain == PortAgeTerrain.CAVE) {
             List<Identifier> caves = server.registryAccess().lookupOrThrow(Registries.BIOME).listElements()
                     .filter(PortRegistryPages::isCaveBiome)
@@ -68,7 +69,7 @@ public final class PortRandomAgeSelection {
         return surface.isEmpty() ? List.of(Identifier.withDefaultNamespace("plains")) : surface;
     }
 
-    private static <T> T weighted(Random random, List<T> choices, int[] weights) {
+    static <T> T weighted(Random random, List<T> choices, int[] weights) {
         int total = 0;
         for (int weight : weights) total += weight;
         int ticket = random.nextInt(total);

ports/mc263/src/main/java/net/dnorberg/rivencraft/age/PortRandomFeatureSelection.java

@@ -0,0 +1,85 @@
+package net.dnorberg.rivencraft.age;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Random;
+import net.dnorberg.rivencraft.writing.PortAuthoredWriting;
+import net.dnorberg.rivencraft.writing.PortRegistryPages;
+import net.minecraft.resources.Identifier;
+
+/** Frozen page-free material features and rare formations from 1.21.1. */
+public final class PortRandomFeatureSelection {
+    private PortRandomFeatureSelection() {}
+    public record Selection(PortRockPlan rocks, PortLakePlan lakes, PortTerrainFeaturePlan terrain, int dungeons) {}
+
+    public static Selection select(net.minecraft.server.MinecraftServer server, long seed,
+                                    PortAgeTerrain terrain, PortBiomePlan biomes) {
+        var base = select(seed, terrain);
+        var structures = PortRandomStructureSelection.select(server, seed, terrain, biomes);
+        var plan = base.terrain();
+        plan = plan == null ? new PortTerrainFeaturePlan(List.of(), false, 0, false, structures.structures(), List.of(), true)
+                    : new PortTerrainFeaturePlan(plan.choices(), plan.skylands(), plan.denseOres(), plan.starFissures(),
+                            structures.structures(), plan.carvers(), true);
+        return new Selection(base.rocks(), base.lakes(), plan, structures.dungeons());
+    }
+
+    public static Selection select(long seed, PortAgeTerrain terrain) {
+        var random = new Random(seed ^ 0x4D4154455249414CL);
+        int count = random.nextInt(3);
+        var terrainPage = id("terrain/" + terrain.name().toLowerCase(java.util.Locale.ROOT));
+        var candidates = new ArrayList<PortRankedChoice.Option<Identifier>>();
+        for (String name : List.of("rocks", "floating_islands", "tendrils", "spheres", "spikes", "obelisks",
+                "surface_lakes", "deep_lakes", "lava_lakes")) {
+            var page = id("feature/" + name);
+            if (PortAuthoredWriting.supports(List.of(terrainPage, page)))
+                candidates.add(new PortRankedChoice.Option<>(page, rank(name)));
+        }
+        var pages = new ArrayList<Identifier>();
+        pages.add(terrainPage);
+        List<Identifier> solids = PortRegistryPages.solidMaterialIds(), fluids = PortRegistryPages.fluidMaterialIds();
+        for (int selected = 0; selected < count && !candidates.isEmpty();) {
+            Identifier feature = PortRankedChoice.choose(random, candidates);
+            candidates.removeIf(option -> option.value().equals(feature));
+            var materials = PortLakePlan.isLake(feature) ? fluids : solids;
+            if (materials.isEmpty()) continue;
+            pages.add(PortRegistryPages.blockPageId(materials.get(random.nextInt(materials.size()))));
+            pages.add(feature);
+            selected++;
+        }
+        if (terrain != PortAgeTerrain.FLAT && terrain != PortAgeTerrain.VOID
+                && Math.floorMod(mix(seed ^ 0x534B594C414E4453L), 8) == 0)
+            pages.add(PortTerrainFeaturePlan.SKYLANDS);
+        if (terrain != PortAgeTerrain.CAVE && terrain != PortAgeTerrain.VOID && random.nextInt(10) == 0)
+            pages.add(PortTerrainFeaturePlan.CRYSTAL_FORMATIONS);
+        if (randomStarFissure(seed)) pages.add(PortTerrainFeaturePlan.STAR_FISSURES);
+        return new Selection(PortAuthoredWriting.rockPlan(pages, seed), PortAuthoredWriting.lakePlan(pages, seed),
+                PortAuthoredWriting.terrainFeaturePlan(pages, seed), 0);
+    }
+
+    private static int rank(String name) {
+        return switch (name) {
+            case "surface_lakes", "deep_lakes" -> 1;
+            case "lava_lakes" -> 2;
+            case "spheres", "spikes", "obelisks" -> 3;
+            default -> 4;
+        };
+    }
+
+    private static boolean randomStarFissure(long seed) {
+        var random = new Random(mix(seed ^ 0x535441524752414DL));
+        for (int step = 0; step < 27; step++) {
+            int branch = random.nextInt(5);
+            if (branch == 0) return false;
+            if (random.nextInt(9) == 0) return true;
+            if (branch == 1) return false;
+        }
+        return false;
+    }
+
+    private static Identifier id(String path) { return Identifier.fromNamespaceAndPath("rivencraft", path); }
+    private static long mix(long value) {
+        value = (value ^ value >>> 30) * 0xBF58476D1CE4E5B9L;
+        value = (value ^ value >>> 27) * 0x94D049BB133111EBL;
+        return value ^ value >>> 31;
+    }
+}

ports/mc263/src/main/java/net/dnorberg/rivencraft/age/PortRandomStructureSelection.java

@@ -0,0 +1,69 @@
+package net.dnorberg.rivencraft.age;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Random;
+import java.util.Set;
+import net.minecraft.core.registries.Registries;
+import net.minecraft.resources.Identifier;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.world.level.dimension.LevelStem;
+
+/** Creation-only structure completion, adapted from 1.21.1 AgeStructureSelection. */
+public final class PortRandomStructureSelection {
+    private static final Identifier DUNGEONS = page("dungeons");
+    private PortRandomStructureSelection() {}
+    public record Selection(int dungeons, List<Identifier> structures) {
+        public Selection { structures = List.copyOf(structures); }
+    }
+
+    public static Selection select(MinecraftServer server, long seed, PortAgeTerrain terrain, PortBiomePlan plan) {
+        Set<Identifier> biomes = actualBiomes(server, terrain, plan);
+        var eligible = new ArrayList<PortRankedChoice.Option<Identifier>>();
+        for (String name : List.of("dungeons", "mineshafts", "nether_fortresses", "strongholds", "villages",
+                "trial_chambers", "bastions", "buried_treasure", "shipwrecks", "ocean_ruins", "pillager_outposts",
+                "ruined_portals", "nether_fossils", "ancient_cities", "trail_ruins", "abandoned_camps")) {
+            Identifier feature = page(name);
+            boolean allowed = feature.equals(DUNGEONS)
+                    ? net.dnorberg.rivencraft.writing.PortAuthoredWriting.supports(List.of(
+                            Identifier.fromNamespaceAndPath("rivencraft", "terrain/" + terrain.name().toLowerCase(java.util.Locale.ROOT)), feature))
+                        && server.registryAccess().lookupOrThrow(Registries.PLACED_FEATURE)
+                            .get(ResourceKey.create(Registries.PLACED_FEATURE,
+                                    Identifier.fromNamespaceAndPath("rivencraft", "dungeons"))).isPresent()
+                    : PortStructurePages.randomEligible(feature, terrain, biomes, server.registryAccess());
+            if (allowed) eligible.add(new PortRankedChoice.Option<>(feature, rank(name)));
+        }
+        var random = new Random(seed ^ 0x5354525543545552L);
+        int count = random.nextInt(3), dungeons = 0;
+        var structures = new ArrayList<Identifier>();
+        for (int selected = 0; selected < count && !eligible.isEmpty(); selected++) {
+            var feature = PortRankedChoice.choose(random, eligible);
+            if (feature.equals(DUNGEONS)) dungeons++;
+            else structures.add(feature);
+            eligible.removeIf(option -> option.value().equals(feature));
+        }
+        return new Selection(dungeons, structures);
+    }
+
+    private static Set<Identifier> actualBiomes(MinecraftServer server, PortAgeTerrain terrain, PortBiomePlan plan) {
+        if (plan != null && plan.distribution() != PortBiomePlan.Distribution.NATIVE)
+            return Set.copyOf(plan.biomes());
+        if (terrain == PortAgeTerrain.FLAT) return Set.of(Identifier.withDefaultNamespace("plains"));
+        if (terrain == PortAgeTerrain.VOID) return Set.of(Identifier.withDefaultNamespace("the_void"));
+        if (terrain == PortAgeTerrain.CAVE) return Set.of(Identifier.withDefaultNamespace("lush_caves"));
+        return server.registryAccess().lookupOrThrow(Registries.LEVEL_STEM).getOrThrow(LevelStem.OVERWORLD)
+                .value().generator().getBiomeSource().possibleBiomes().stream()
+                .flatMap(holder -> holder.unwrapKey().stream()).map(key -> key.identifier())
+                .collect(java.util.stream.Collectors.toUnmodifiableSet());
+    }
+
+    private static int rank(String name) {
+        return switch (name) {
+            case "villages", "strongholds", "mineshafts" -> 1;
+            case "dungeons", "nether_fortresses" -> 2;
+            default -> 3;
+        };
+    }
+    private static Identifier page(String name) { return Identifier.fromNamespaceAndPath("rivencraft", "feature/" + name); }
+}

ports/mc263/src/main/java/net/dnorberg/rivencraft/age/PortRankedChoice.java

@@ -0,0 +1,36 @@
+package net.dnorberg.rivencraft.age;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Random;
+
+/** The 1.21.1 LegacyRankChoice rule, retained for seeded grammar completion. */
+final class PortRankedChoice {
+    private PortRankedChoice() {}
+    record Option<T>(T value, int rank) {}
+
+    static <T> T choose(Random random, List<Option<T>> options) {
+        if (options.isEmpty()) throw new IllegalArgumentException("No ranked choices");
+        var counts = new HashMap<Integer, Integer>();
+        int highest = 0;
+        for (var option : options) {
+            counts.merge(option.rank(), 1, Integer::sum);
+            highest = Math.max(highest, option.rank());
+        }
+        var weights = new HashMap<Integer, Integer>();
+        int weight = 1, previousTotal = 0;
+        for (int rank = highest; rank >= 0; rank--) {
+            int count = counts.getOrDefault(rank, 0);
+            if (weight != 1 && count > 0) weight = Math.max(weight, previousTotal / count + 1);
+            weights.put(rank, weight);
+            previousTotal = count * weight;
+            weight++;
+        }
+        int ticket = random.nextInt(options.stream().mapToInt(option -> weights.get(option.rank())).sum());
+        for (var option : options) {
+            ticket -= weights.get(option.rank());
+            if (ticket < 0) return option.value();
+        }
+        throw new IllegalStateException("Ranked choice ticket was not consumed");
+    }
+}

ports/mc263/src/main/java/net/dnorberg/rivencraft/age/PortSkyStyle.java

@@ -0,0 +1,66 @@
+package net.dnorberg.rivencraft.age;
+
+import com.mojang.serialization.Codec;
+import java.util.List;
+import java.util.Locale;
+import java.util.Random;
+import net.dnorberg.rivencraft.Rivencraft;
+import net.minecraft.resources.Identifier;
+
+/** Persisted sky styles, including the client-rendered Legacy static background. */
+public enum PortSkyStyle {
+    OVERWORLD, NETHER, END, STATIC;
+
+    public static final Codec<PortSkyStyle> CODEC = Codec.STRING.xmap(
+            name -> valueOf(name.toUpperCase(Locale.ROOT)), sky -> sky.name().toLowerCase(Locale.ROOT));
+
+    public static PortSkyStyle forPage(Identifier page) {
+        if (!page.getNamespace().equals(Rivencraft.MOD_ID)) return null;
+        return switch (page.getPath()) {
+            case "sky/overworld" -> OVERWORLD;
+            case "sky/nether" -> NETHER;
+            case "sky/end" -> END;
+            case "sky/static" -> STATIC;
+            default -> null;
+        };
+    }
+
+    public static PortSkyStyle resolve(List<Identifier> pages, long seed) {
+        return pages.stream().map(PortSkyStyle::forPage).filter(java.util.Objects::nonNull)
+                .findFirst().orElseGet(() -> pages.stream().anyMatch(PortSkyStyle::isCelestial)
+                        ? OVERWORLD : random(seed));
+    }
+
+    /** Nether-style Ages use their fog clear color as the visible backdrop. */
+    public static float fogShade(net.minecraft.world.level.Level level) {
+        boolean nether = level.dimensionTypeRegistration().unwrapKey().map(key ->
+                key.identifier().getNamespace().equals("rivencraft")
+                        && key.identifier().getPath().endsWith("_sky_nether")).orElse(false);
+        var cycle = PortDayCycle.forLevel(level);
+        return nether && !cycle.bodies().isEmpty()
+                ? 1F - 0.65F * PortCelestialBody.eclipseAt(cycle.bodies(), PortDayCycle.nativeTicks(level)) : 1F;
+    }
+
+    private static boolean isCelestial(Identifier page) {
+        if (!page.getNamespace().equals(Rivencraft.MOD_ID)) return false;
+        return switch (page.getPath()) {
+            // Preserve the established compatible-default rule for written controllers.
+            case "celestial/normal_time", "celestial/sun", "celestial/moon" -> true;
+            default -> false;
+        };
+    }
+
+    private static PortSkyStyle random(long seed) {
+        // Match the first draw in 1.21.1 AgeSkyProfile.random: its equally
+        // likely INHERITED and OVERWORLD slots currently share the native
+        // Overworld presentation here. Do not add unported colors/bodies.
+        int choice = new Random(seed ^ 0x534B5950524F464CL).nextInt(5);
+        return switch (choice) {
+            case 0, 1 -> OVERWORLD;
+            case 2 -> NETHER;
+            case 3 -> END;
+            case 4 -> STATIC;
+            default -> throw new IllegalStateException("Invalid random sky choice");
+        };
+    }
+}

ports/mc263/src/main/java/net/dnorberg/rivencraft/age/PortStructurePages.java

@@ -88,6 +88,20 @@ public final class PortStructurePages {
                         .orElseThrow(() -> new IllegalArgumentException("Missing structure set for " + page)));
     }
 
+    /** Random choices need at least one normally eligible biome; authored pages may override it. */
+    public static boolean randomEligible(Identifier page, PortAgeTerrain terrain, Set<Identifier> biomes,
+                                         HolderLookup.Provider registries) {
+        if (!supportsTerrain(page, terrain)) return false;
+        var set = registries.lookupOrThrow(Registries.STRUCTURE_SET)
+                .get(ResourceKey.create(Registries.STRUCTURE_SET, SETS.get(page)));
+        if (set.isEmpty()) return false;
+        var compatible = set.get().value().structures().stream()
+                .flatMap(entry -> entry.structure().value().biomes().stream())
+                .flatMap(holder -> holder.unwrapKey().stream()).map(key -> key.identifier())
+                .collect(java.util.stream.Collectors.toSet());
+        return compatible.isEmpty() || biomes.stream().anyMatch(compatible::contains);
+    }
+
     private static Map<Identifier, Integer> enabled(List<Identifier> pages) {
         Map<Identifier, Integer> result = new HashMap<>();
         for (Identifier page : pages) result.merge(SETS.get(page), 1, Integer::sum);

ports/mc263/src/main/java/net/dnorberg/rivencraft/age/PortTerrainFeaturePlan.java

@@ -9,7 +9,8 @@ import net.minecraft.resources.Identifier;
 
 /** Frozen terrain filters and ordered solid/surface features for an Age. */
 public record PortTerrainFeaturePlan(List<Choice> choices, boolean skylands, int denseOres,
-                                     boolean starFissures, List<Identifier> structures, List<Identifier> carvers) {
+                                     boolean starFissures, List<Identifier> structures, List<Identifier> carvers,
+                                     boolean structureControl) {
     public static final Identifier FLOATING_ISLANDS = Identifier.fromNamespaceAndPath(
             Rivencraft.MOD_ID, "feature/floating_islands");
     public static final Identifier TENDRILS = Identifier.fromNamespaceAndPath(Rivencraft.MOD_ID, "feature/tendrils");
@@ -30,7 +31,8 @@ public record PortTerrainFeaturePlan(List<Choice> choices, boolean skylands, int
                     .forGetter(PortTerrainFeaturePlan::denseOres),
             Codec.BOOL.optionalFieldOf("star_fissures", false).forGetter(PortTerrainFeaturePlan::starFissures),
             Identifier.CODEC.listOf().optionalFieldOf("structures", List.of()).forGetter(PortTerrainFeaturePlan::structures),
-            Identifier.CODEC.listOf().optionalFieldOf("carvers", List.of()).forGetter(PortTerrainFeaturePlan::carvers)
+            Identifier.CODEC.listOf().optionalFieldOf("carvers", List.of()).forGetter(PortTerrainFeaturePlan::carvers),
+            Codec.BOOL.optionalFieldOf("structure_control", false).forGetter(PortTerrainFeaturePlan::structureControl)
     ).apply(instance, PortTerrainFeaturePlan::new));
 
     public record Choice(Identifier page, Identifier material) {
@@ -55,7 +57,7 @@ public record PortTerrainFeaturePlan(List<Choice> choices, boolean skylands, int
         PortCarverPages.validateCounts(carvers);
         if (denseOres < 0 || denseOres > MAX_PER_FEATURE)
             throw new IllegalArgumentException("Dense Ores permits at most 32 occurrences");
-        if (choices.isEmpty() && !skylands && denseOres == 0 && !starFissures && structures.isEmpty() && carvers.isEmpty())
+        if (choices.isEmpty() && !skylands && denseOres == 0 && !starFissures && structures.isEmpty() && carvers.isEmpty() && !structureControl)
             throw new IllegalArgumentException("Terrain feature plan must not be empty");
         var counts = new HashMap<Identifier, Integer>();
         for (Choice choice : choices) {
@@ -64,6 +66,11 @@ public record PortTerrainFeaturePlan(List<Choice> choices, boolean skylands, int
         }
     }
 
+    public PortTerrainFeaturePlan(List<Choice> choices, boolean skylands, int denseOres,
+                                 boolean starFissures, List<Identifier> structures, List<Identifier> carvers) {
+        this(choices, skylands, denseOres, starFissures, structures, carvers, false);
+    }
+
     public PortTerrainFeaturePlan(List<Choice> choices, boolean skylands, int denseOres,
                                  boolean starFissures, List<Identifier> structures) {
         this(choices, skylands, denseOres, starFissures, structures, List.of());

ports/mc263/src/main/java/net/dnorberg/rivencraft/age/PortWeatherMode.java

@@ -1,7 +1,6 @@
 package net.dnorberg.rivencraft.age;
 
 import com.mojang.serialization.Codec;
-import java.util.List;
 import net.dnorberg.rivencraft.Rivencraft;
 import net.minecraft.resources.Identifier;
 
@@ -26,8 +25,4 @@ public enum PortWeatherMode {
         };
     }
 
-    public static PortWeatherMode fromPages(List<Identifier> pages) {
-        return pages.stream().map(PortWeatherMode::forPage).filter(java.util.Objects::nonNull)
-                .findFirst().orElse(NORMAL);
-    }
 }

ports/mc263/src/main/java/net/dnorberg/rivencraft/age/RuntimeAgeBackend.java

@@ -113,13 +113,50 @@ public final class RuntimeAgeBackend {
                                      PortBiomePlan biomePlan, PortAgeTerrain terrain, PortRockPlan rocks,
                                      PortVegetationPlan vegetation, int dungeons, PortLakePlan lakes,
                                      PortTerrainFeaturePlan terrainFeatures, PortWeatherMode weather) {
+        return create(server, id, seed, biomePlan, terrain, rocks, vegetation, dungeons, lakes,
+                terrainFeatures, weather, PortLighting.NORMAL);
+    }
+
+    public static ServerLevel create(MinecraftServer server, Identifier id, long seed,
+                                     PortBiomePlan biomePlan, PortAgeTerrain terrain, PortRockPlan rocks,
+                                     PortVegetationPlan vegetation, int dungeons, PortLakePlan lakes,
+                                     PortTerrainFeaturePlan terrainFeatures, PortWeatherMode weather,
+                                     PortLighting lighting) {
+        return create(server, id, seed, biomePlan, terrain, rocks, vegetation, dungeons, lakes,
+                terrainFeatures, weather, lighting, PortSkyStyle.OVERWORLD);
+    }
+
+    public static ServerLevel create(MinecraftServer server, Identifier id, long seed,
+                                     PortBiomePlan biomePlan, PortAgeTerrain terrain, PortRockPlan rocks,
+                                     PortVegetationPlan vegetation, int dungeons, PortLakePlan lakes,
+                                     PortTerrainFeaturePlan terrainFeatures, PortWeatherMode weather,
+                                     PortLighting lighting, PortSkyStyle sky) {
+        return create(server, id, seed, biomePlan, terrain, rocks, vegetation, dungeons, lakes,
+                terrainFeatures, weather, lighting, sky, PortAgeColors.NATIVE);
+    }
+
+    public static ServerLevel create(MinecraftServer server, Identifier id, long seed,
+                                     PortBiomePlan biomePlan, PortAgeTerrain terrain, PortRockPlan rocks,
+                                     PortVegetationPlan vegetation, int dungeons, PortLakePlan lakes,
+                                     PortTerrainFeaturePlan terrainFeatures, PortWeatherMode weather,
+                                     PortLighting lighting, PortSkyStyle sky, PortAgeColors colors) {
+        return create(server, id, seed, biomePlan, terrain, rocks, vegetation, dungeons, lakes,
+                terrainFeatures, weather, lighting, sky, colors, PortDayCycle.NATIVE);
+    }
+
+    public static ServerLevel create(MinecraftServer server, Identifier id, long seed,
+                                     PortBiomePlan biomePlan, PortAgeTerrain terrain, PortRockPlan rocks,
+                                     PortVegetationPlan vegetation, int dungeons, PortLakePlan lakes,
+                                     PortTerrainFeaturePlan terrainFeatures, PortWeatherMode weather,
+                                     PortLighting lighting, PortSkyStyle sky, PortAgeColors colors, PortDayCycle dayCycle) {
         checkServerThread(server);
         ageName(id);
         AgeLevelIndex index = index(server);
         if (index.contains(id)) throw new IllegalArgumentException("Age already exists: " + id);
-        ServerLevel level = load(server, id, seed, biomePlan, terrain, rocks, vegetation, dungeons, lakes, terrainFeatures);
+        ServerLevel level = load(server, id, seed, biomePlan, terrain, rocks, vegetation, dungeons, lakes,
+                terrainFeatures, lighting, sky, colors, dayCycle);
         ((PortAgeLevel) level).configureWeather(weather);
-        index.add(id, seed, biomePlan, terrain, rocks, vegetation, dungeons, lakes, terrainFeatures);
+        index.add(id, seed, biomePlan, terrain, rocks, vegetation, dungeons, lakes, terrainFeatures, lighting, sky, colors, dayCycle);
         // A newly bound book may be used immediately. Persist its Age identity
         // before publishing the catalog so a later crash cannot leave that
         // book pointing at a world omitted from the on-disk index.
@@ -194,6 +231,10 @@ public final class RuntimeAgeBackend {
         PortTerrainFeaturePlan terrainFeatures = index.terrainFeatures(id);
         boolean loaded = server.getLevel(dimensionKey(id)) != null;
         ArchivePaths paths = archivePaths(server, name);
+        PortLighting lighting = index.lighting(id);
+        PortSkyStyle sky = index.sky(id);
+        PortAgeColors colors = index.colors(id);
+        PortDayCycle dayCycle = index.dayCycle(id);
         if (loaded) unloadLoaded(server, id);
         // Persist the tombstone before moving files: a crash mid-archive must
         // not let an old book silently regenerate this identity.
@@ -211,7 +252,7 @@ public final class RuntimeAgeBackend {
         } catch (IOException | RuntimeException exception) {
             try {
                 index.restoreAfterFailedRetirement(id, seed, biomePlan, terrain, rocks, vegetation, dungeons, lakes,
-                        terrainFeatures);
+                        terrainFeatures, lighting, sky, colors, dayCycle);
                 server.overworld().getDataStorage().saveAndJoin();
             } catch (RuntimeException rollbackFailure) {
                 exception.addSuppressed(rollbackFailure);
@@ -234,6 +275,16 @@ public final class RuntimeAgeBackend {
         return index(server).entries();
     }
 
+    public static Map<Identifier, PortAgeColors> savedColors(MinecraftServer server) {
+        checkServerThread(server);
+        return index(server).colors();
+    }
+
+    public static Map<Identifier, PortDayCycle> savedDayCycles(MinecraftServer server) {
+        checkServerThread(server);
+        return index(server).dayCycles();
+    }
+
     /** Includes retired IDs, which must never be silently reused by a new book. */
     public static boolean isNameTaken(MinecraftServer server, Identifier id) {
         checkServerThread(server);
@@ -337,6 +388,15 @@ public final class RuntimeAgeBackend {
                                     PortBiomePlan biomePlan, PortAgeTerrain terrain, PortRockPlan rocks,
                                     PortVegetationPlan vegetation, int dungeons, PortLakePlan lakes,
                                     PortTerrainFeaturePlan terrainFeatures) {
+        return load(server, id, seed, biomePlan, terrain, rocks, vegetation, dungeons, lakes,
+                terrainFeatures, index(server).lighting(id), index(server).sky(id), index(server).colors(id), index(server).dayCycle(id));
+    }
+
+    private static ServerLevel load(MinecraftServer server, Identifier id, long seed,
+                                    PortBiomePlan biomePlan, PortAgeTerrain terrain, PortRockPlan rocks,
+                                    PortVegetationPlan vegetation, int dungeons, PortLakePlan lakes,
+                                    PortTerrainFeaturePlan terrainFeatures, PortLighting lighting, PortSkyStyle sky,
+                                    PortAgeColors colors, PortDayCycle dayCycle) {
         ResourceKey<Level> key = ResourceKey.create(Registries.DIMENSION, id);
         if (server.getLevel(key) != null) throw new IllegalArgumentException("Level already loaded: " + id);
 
@@ -405,13 +465,16 @@ public final class RuntimeAgeBackend {
                 case CAVE -> dryCaveSettings(server);
                 case FLAT, VOID -> throw new IllegalStateException("Flat terrain should use FlatLevelSource");
             };
-            generator = new NoiseBasedChunkGenerator(source, settings);
+            generator = new NoiseBasedChunkGenerator(source, PortBiomeMaterialRules.apply(server.registryAccess(), settings.value()));
         }
         if (rocks != null || vegetation != null || dungeons > 0 || lakes != null || terrainFeatures != null)
             generator = new PortFeatureChunkGenerator(generator, rocks, vegetation, dungeons, lakes, terrainFeatures, seed);
-        LevelStem stem = new LevelStem(overworldStem.type(), generator, OptionalLong.of(seed));
+        LevelStem stem = new LevelStem(lighting.dimensionType(server, terrain, overworldStem.type(), sky),
+                generator, OptionalLong.of(seed));
         long biomeZoomSeed = BiomeManager.obfuscateSeed(server.getWorldGenSettings().options().seed());
         ServerLevel level = new PortAgeLevel(server, key, stem, biomeZoomSeed, terrain);
+        ((PortAgeLevel) level).configureColors(colors);
+        ((PortAgeLevel) level).configureDayCycle(dayCycle);
 
         // Publish only after the constructor succeeds. If the load event fails,
         // roll back the map and close the newly opened chunk/entity stores.

ports/mc263/src/main/java/net/dnorberg/rivencraft/client/AgeCatalogClient.java

@@ -18,10 +18,22 @@ public final class AgeCatalogClient {
     private AgeCatalogClient() {
     }
 
+    @SubscribeEvent
+    public static void logout(net.neoforged.neoforge.client.event.ClientPlayerNetworkEvent.LoggingOut event) {
+        net.dnorberg.rivencraft.age.PortAgeColors.updateClient(java.util.Map.of());
+        net.dnorberg.rivencraft.age.PortDayCycle.updateClient(java.util.Map.of());
+    }
+
     @SubscribeEvent
     public static void register(RegisterClientPayloadHandlersEvent event) {
         event.register(AgeCatalogPayload.TYPE, (payload, context) -> {
             if (!(context.listener() instanceof ClientPacketListener listener)) return;
+            net.dnorberg.rivencraft.age.PortAgeColors.updateClient(payload.colors());
+            net.dnorberg.rivencraft.age.PortDayCycle.updateClient(payload.dayCycles());
+            if (listener.getLevel() != null) {
+                listener.getLevel().environmentAttributes().invalidateTickCache();
+                listener.getLevel().updateSkyBrightness();
+            }
             listener.levels = payload.dimensions().stream()
                     .map(id -> ResourceKey.<Level>create(Registries.DIMENSION, id))
                     .collect(Collectors.toUnmodifiableSet());

ports/mc263/src/main/java/net/dnorberg/rivencraft/client/PortCelestialDiscs.java

@@ -0,0 +1,85 @@
+package net.dnorberg.rivencraft.client;
+
+import com.mojang.blaze3d.systems.RenderSystem;
+import com.mojang.blaze3d.vertex.BufferBuilder;
+import com.mojang.blaze3d.vertex.ByteBufferBuilder;
+import com.mojang.blaze3d.vertex.DefaultVertexFormat;
+import com.mojang.renderpearl.api.buffers.GpuBuffer;
+import com.mojang.renderpearl.api.commands.RenderPass;
+import com.mojang.renderpearl.api.pipeline.BlendFunction;
+import com.mojang.renderpearl.api.pipeline.ColorTargetState;
+import com.mojang.renderpearl.api.pipeline.PrimitiveTopology;
+import com.mojang.renderpearl.api.pipeline.RenderPipeline;
+import java.util.IdentityHashMap;
+import java.util.Map;
+import net.dnorberg.rivencraft.Rivencraft;
+import net.minecraft.client.renderer.RenderPipelines;
+import net.minecraft.client.renderer.texture.TextureAtlas;
+import net.minecraft.client.renderer.texture.TextureAtlasSprite;
+import net.minecraft.resources.Identifier;
+import net.minecraft.world.level.MoonPhase;
+import net.neoforged.api.distmarker.Dist;
+import net.neoforged.bus.api.SubscribeEvent;
+import net.neoforged.fml.common.EventBusSubscriber;
+import net.neoforged.neoforge.client.event.RegisterRenderPipelinesEvent;
+import org.joml.Matrix4f;
+import org.joml.Vector4f;
+
+/** Legacy's opaque central disc, separate from the native transparent glow. */
+@EventBusSubscriber(modid = Rivencraft.MOD_ID, value = Dist.CLIENT)
+public final class PortCelestialDiscs implements AutoCloseable {
+    private static final Identifier SUN = Identifier.withDefaultNamespace("sun");
+    private static final RenderPipeline CORE = RenderPipelines.CELESTIAL.toBuilder()
+            .withLocation(Identifier.fromNamespaceAndPath(Rivencraft.MOD_ID, "pipeline/celestial_core"))
+            .withColorTargetState(new ColorTargetState(BlendFunction.TRANSLUCENT)).build();
+    private final Map<TextureAtlasSprite, GpuBuffer> cores = new IdentityHashMap<>();
+    private TextureAtlasSprite atlasGeneration;
+
+    @SubscribeEvent public static void register(RegisterRenderPipelinesEvent event) { event.registerPipeline(CORE); }
+
+    public void draw(RenderPass pass, TextureAtlas atlas, boolean moon, MoonPhase phase,
+                     Matrix4f transform, int color, float alpha) {
+        if (alpha <= 0) return;
+        var generation = atlas.getSprite(SUN);
+        if (generation != atlasGeneration) {
+            close();
+            atlasGeneration = generation;
+        }
+        var sprite = moon ? atlas.getSprite(Identifier.withDefaultNamespace("moon/" + phase.getSerializedName())) : generation;
+        var buffer = cores.computeIfAbsent(sprite, ignored -> build(sprite, moon));
+        var indices = RenderSystem.getSequentialBuffer(PrimitiveTopology.QUADS);
+        var indexBuffer = indices.getBuffer(6);
+        var rgb = net.dnorberg.rivencraft.age.PortAgeColors.vector(color);
+        var uniforms = RenderSystem.getDynamicUniforms().writeTransform(transform, new Vector4f(rgb, alpha));
+        pass.setPipeline(RenderSystem.getCompiledPipeline(CORE));
+        RenderSystem.bindDefaultUniforms(pass);
+        pass.setUniform("DynamicTransforms", uniforms);
+        pass.setUniform("Sampler0", atlas.getTextureView(), atlas.getSampler());
+        pass.setVertexBuffer(0, buffer.slice());
+        pass.setIndexBuffer(indexBuffer, indices.type());
+        pass.drawIndexed(6, 1, 0, 0, 0);
+    }
+
+    private static GpuBuffer build(TextureAtlasSprite sprite, boolean moon) {
+        var format = DefaultVertexFormat.POSITION_TEX;
+        try (var bytes = ByteBufferBuilder.exactlySized(4 * format.getVertexSize())) {
+            var builder = new BufferBuilder(bytes, PrimitiveTopology.QUADS, format);
+            // Same 8/32 central area as root's ordinary-alpha second pass.
+            float u0 = sprite.getU(0.375F), u1 = sprite.getU(0.625F);
+            float v0 = sprite.getV(0.375F), v1 = sprite.getV(0.625F);
+            builder.addVertex(-0.25F, 0, -0.25F).setUv(moon ? u1 : u0, moon ? v1 : v0);
+            builder.addVertex(0.25F, 0, -0.25F).setUv(moon ? u0 : u1, moon ? v1 : v0);
+            builder.addVertex(0.25F, 0, 0.25F).setUv(moon ? u0 : u1, moon ? v0 : v1);
+            builder.addVertex(-0.25F, 0, 0.25F).setUv(moon ? u1 : u0, moon ? v0 : v1);
+            try (var mesh = builder.buildOrThrow()) {
+                return RenderSystem.getDevice().createBuffer(() -> "Rivencraft celestial core", 40, mesh.vertexBuffer());
+            }
+        }
+    }
+
+    @Override public void close() {
+        cores.values().forEach(GpuBuffer::close);
+        cores.clear();
+        atlasGeneration = null;
+    }
+}

ports/mc263/src/main/java/net/dnorberg/rivencraft/client/PortStaticSky.java

@@ -0,0 +1,93 @@
+package net.dnorberg.rivencraft.client;
+
+import com.mojang.blaze3d.pipeline.RenderTarget;
+import com.mojang.blaze3d.systems.RenderSystem;
+import com.mojang.blaze3d.vertex.BufferBuilder;
+import com.mojang.blaze3d.vertex.ByteBufferBuilder;
+import com.mojang.blaze3d.vertex.DefaultVertexFormat;
+import com.mojang.blaze3d.vertex.MeshData;
+import com.mojang.renderpearl.api.buffers.GpuBuffer;
+import com.mojang.renderpearl.api.buffers.GpuBufferSlice;
+import com.mojang.renderpearl.api.pipeline.PrimitiveTopology;
+import java.util.Optional;
+import java.util.OptionalDouble;
+import net.minecraft.client.renderer.RenderPipelines;
+import net.minecraft.client.renderer.texture.DynamicTexture;
+import net.minecraft.util.RandomSource;
+import org.joml.Matrix4f;
+
+/** Legacy's six 48x48 noise faces, uploaded once per animation frame rather than per cell. */
+public final class PortStaticSky implements AutoCloseable {
+    private static final int GRID = 48;
+    private final DynamicTexture texture = new DynamicTexture("Rivencraft static sky", GRID * 6, GRID, false);
+    private final GpuBuffer cube = buildCube();
+    private long uploadedFrame = Long.MIN_VALUE;
+    private int uploadedTint = -1;
+
+    public void render(RenderTarget target, GpuBufferSlice fog, long frame, int tint) {
+        if (tint < 0) tint = 0x929292;
+        if (uploadedFrame != frame || uploadedTint != tint) {
+            RandomSource random = RandomSource.create(frame);
+            var image = texture.getPixels();
+            for (int face = 0; face < 6; face++) {
+                for (int y = 0; y < GRID; y++) {
+                    for (int x = 0; x < GRID; x++) {
+                        int noise = 65 + random.nextInt(160);
+                        int red = (tint >> 16 & 255) * noise / 255;
+                        int green = (tint >> 8 & 255) * noise / 255;
+                        int blue = (tint & 255) * noise / 255;
+                        image.setPixel(face * GRID + x, y, 0xff000000 | red << 16 | green << 8 | blue);
+                    }
+                }
+            }
+            texture.upload();
+            uploadedFrame = frame;
+            uploadedTint = tint;
+        }
+        RenderSystem.setShaderFog(fog);
+        var indices = RenderSystem.getSequentialBuffer(PrimitiveTopology.QUADS);
+        var indexBuffer = indices.getBuffer(36);
+        var transform = RenderSystem.getDynamicUniforms().writeTransform(RenderSystem.getModelViewMatrixCopy());
+        try (var pass = RenderSystem.getDevice().createCommandEncoder().createRenderPass(
+                () -> "Rivencraft static sky", target.getColorTextureView(), Optional.empty(),
+                target.getDepthTextureView(), OptionalDouble.empty())) {
+            pass.setPipeline(RenderSystem.getCompiledPipeline(RenderPipelines.END_SKY));
+            RenderSystem.bindDefaultUniforms(pass);
+            pass.setUniform("DynamicTransforms", transform);
+            pass.setUniform("Sampler0", texture.getTextureView(), texture.getSampler());
+            pass.setVertexBuffer(0, cube.slice());
+            pass.setIndexBuffer(indexBuffer, indices.type());
+            pass.drawIndexed(36, 1, 0, 0, 0);
+        }
+    }
+
+    private static GpuBuffer buildCube() {
+        var format = DefaultVertexFormat.POSITION_TEX_COLOR;
+        try (var bytes = ByteBufferBuilder.exactlySized(24 * format.getVertexSize())) {
+            var builder = new BufferBuilder(bytes, PrimitiveTopology.QUADS, format);
+            for (int face = 0; face < 6; face++) {
+                var pose = new Matrix4f();
+                switch (face) {
+                    case 1 -> pose.rotationX((float) Math.PI / 2);
+                    case 2 -> pose.rotationX((float) -Math.PI / 2);
+                    case 3 -> pose.rotationX((float) Math.PI);
+                    case 4 -> pose.rotationZ((float) Math.PI / 2);
+                    case 5 -> pose.rotationZ((float) -Math.PI / 2);
+                }
+                float u0 = face / 6f, u1 = (face + 1) / 6f;
+                builder.addVertex(pose, -100, -100, -100).setUv(u0, 0).setColor(-1);
+                builder.addVertex(pose, -100, -100, 100).setUv(u0, 1).setColor(-1);
+                builder.addVertex(pose, 100, -100, 100).setUv(u1, 1).setColor(-1);
+                builder.addVertex(pose, 100, -100, -100).setUv(u1, 0).setColor(-1);
+            }
+            try (MeshData mesh = builder.buildOrThrow()) {
+                return RenderSystem.getDevice().createBuffer(() -> "Rivencraft static sky cube", 40, mesh.vertexBuffer());
+            }
+        }
+    }
+
+    @Override public void close() {
+        cube.close();
+        texture.close();
+    }
+}

ports/mc263/src/main/java/net/dnorberg/rivencraft/client/StaticSkyState.java

@@ -0,0 +1,22 @@
+package net.dnorberg.rivencraft.client;
+
+/** Carries extracted sky presentation values without live-world reads during drawing. */
+public interface StaticSkyState {
+    int rivencraft$bodyOverlay();
+    void rivencraft$bodyOverlay(int mode);
+    record Body(int kind, float angle, int bearing, float size, int color, float eclipse) {}
+    java.util.List<Body> rivencraft$bodies();
+    void rivencraft$bodies(java.util.List<Body> bodies);
+    long rivencraft$staticFrame();
+    void rivencraft$staticFrame(long frame);
+    int rivencraft$skyTint();
+    void rivencraft$skyTint(int color);
+    int rivencraft$orbitBearing();
+    void rivencraft$orbitBearing(int bearing);
+    float rivencraft$sunSize();
+    void rivencraft$sunSize(float size);
+    int rivencraft$celestialTint();
+    void rivencraft$celestialTint(int color);
+    int rivencraft$bodyMode();
+    void rivencraft$bodyMode(int mode);
+}

ports/mc263/src/main/java/net/dnorberg/rivencraft/mixin/AgeAmbientLightMixin.java

@@ -0,0 +1,23 @@
+package net.dnorberg.rivencraft.mixin;
+
+import com.llamalad7.mixinextras.injector.ModifyReturnValue;
+import net.dnorberg.rivencraft.age.PortLighting;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.LevelHeightAccessor;
+import net.minecraft.world.level.lighting.LevelLightEngine;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+
+/** Ambient light contributes to effective brightness, not fake block/sky propagation. */
+@Mixin(LevelLightEngine.class)
+public abstract class AgeAmbientLightMixin {
+    @Shadow @Final protected LevelHeightAccessor levelHeightAccessor;
+
+    @ModifyReturnValue(method = "getRawBrightness", at = @At("RETURN"))
+    private int rivencraft$ambientBrightness(int brightness) {
+        return levelHeightAccessor instanceof Level level && PortLighting.isBright(level)
+                ? Math.max(brightness, 15) : brightness;
+    }
+}

ports/mc263/src/main/java/net/dnorberg/rivencraft/mixin/AgeColorAttributesMixin.java

@@ -0,0 +1,34 @@
+package net.dnorberg.rivencraft.mixin;
+
+import net.dnorberg.rivencraft.age.PortAgeColors;
+import net.minecraft.world.attribute.EnvironmentAttributeSystem;
+import net.minecraft.world.attribute.EnvironmentAttributes;
+import net.minecraft.world.level.Level;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+@Mixin(EnvironmentAttributeSystem.Builder.class)
+public class AgeColorAttributesMixin {
+    @Inject(method = "addDefaultLayers", at = @At("RETURN"))
+    private void rivencraft$colors(Level level, CallbackInfoReturnable<EnvironmentAttributeSystem.Builder> cir) {
+        var id = level.dimension().identifier();
+        if (!id.getNamespace().equals("rivencraft") || !id.getPath().startsWith("age/")) return;
+        var builder = cir.getReturnValue();
+        builder.addTimeBasedLayer(EnvironmentAttributes.SKY_COLOR, (base, tick) -> {
+            int rgb = PortAgeColors.forLevel(level).sky();
+            return rgb < 0 ? base : PortAgeColors.vector(rgb);
+        });
+        builder.addTimeBasedLayer(EnvironmentAttributes.FOG_COLOR, (base, tick) -> {
+            int rgb = PortAgeColors.forLevel(level).sky();
+            var color = rgb < 0 ? base : PortAgeColors.vector(rgb);
+            float shade = net.dnorberg.rivencraft.age.PortSkyStyle.fogShade(level);
+            return shade == 1F ? color : new org.joml.Vector3f(color).mul(shade);
+        });
+        builder.addTimeBasedLayer(EnvironmentAttributes.AMBIENT_LIGHT_COLOR, (base, tick) -> {
+            int rgb = PortAgeColors.forLevel(level).ambient();
+            return rgb < 0 ? base : PortAgeColors.vector(rgb);
+        });
+    }
+}

ports/mc263/src/main/java/net/dnorberg/rivencraft/mixin/AgeDayTimelineMixin.java

@@ -0,0 +1,49 @@
+package net.dnorberg.rivencraft.mixin;
+
+import net.dnorberg.rivencraft.age.PortDayCycle;
+import net.minecraft.world.attribute.EnvironmentAttributeSystem;
+import net.minecraft.world.attribute.EnvironmentAttributes;
+import net.minecraft.world.attribute.WeatherAttributes;
+import net.minecraft.world.level.Level;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+@Mixin(EnvironmentAttributeSystem.Builder.class)
+public class AgeDayTimelineMixin {
+    @Inject(method = "addDefaultLayers", at = @At("RETURN"))
+    private void rivencraft$singleBody(Level level, CallbackInfoReturnable<EnvironmentAttributeSystem.Builder> cir) {
+        var id = level.dimension().identifier();
+        if (!id.getNamespace().equals("rivencraft") || !id.getPath().startsWith("age/")) return;
+        var builder = cir.getReturnValue();
+        builder.addTimeBasedLayer(EnvironmentAttributes.SUN_ANGLE, (base, tick) -> {
+            var cycle = PortDayCycle.forLevel(level);
+            return cycle.singleBody() ? cycle.bodyAngle(PortDayCycle.nativeTicks(level)) : base;
+        });
+        builder.addTimeBasedLayer(EnvironmentAttributes.MOON_ANGLE, (base, tick) -> {
+            var cycle = PortDayCycle.forLevel(level);
+            return cycle.singleBody() ? cycle.bodyAngle(PortDayCycle.nativeTicks(level)) : base;
+        });
+        builder.addTimeBasedLayer(EnvironmentAttributes.SKY_LIGHT_LEVEL, (base, tick) -> {
+            var cycle = PortDayCycle.forLevel(level);
+            if (!cycle.customLight()) return base;
+            // Match root AgeSkyProfile.lightAt and LevelSkyBrightnessMixin's
+            // single skylight channel. Bright/Dark and no-skylight geometry remain separate.
+            float weather = (1F - level.getRainLevel(1F) * 5F / 16F)
+                    * (1F - level.getThunderLevel(1F) * 5F / 16F);
+            return 15F - (int) ((1F - cycle.bodyLight(PortDayCycle.nativeTicks(level)) * weather) * 11F);
+        });
+    }
+
+    @Inject(method = "addDynamicLayers", at = @At("HEAD"), cancellable = true)
+    private void rivencraft$dayCycle(Level level, CallbackInfoReturnable<EnvironmentAttributeSystem.Builder> cir) {
+        var id = level.dimension().identifier();
+        if (!id.getNamespace().equals("rivencraft") || !id.getPath().startsWith("age/")) return;
+        var builder = (EnvironmentAttributeSystem.Builder) (Object) this;
+        var clocks = PortDayCycle.timelines(level, level.clockManager());
+        level.dimensionType().timelines().forEach(timeline -> builder.addTimelineLayer(timeline, clocks));
+        if (level.canHaveWeather()) WeatherAttributes.addBuiltinLayers(builder, WeatherAttributes.WeatherAccess.from(level));
+        cir.setReturnValue(builder);
+    }
+}

ports/mc263/src/main/java/net/dnorberg/rivencraft/mixin/StaticSkyRendererMixin.java

@@ -0,0 +1,292 @@
+package net.dnorberg.rivencraft.mixin;
+
+import com.mojang.blaze3d.pipeline.RenderTarget;
+import com.mojang.renderpearl.api.buffers.GpuBufferSlice;
+import net.dnorberg.rivencraft.client.PortStaticSky;
+import net.dnorberg.rivencraft.client.StaticSkyState;
+import net.minecraft.client.Camera;
+import net.minecraft.client.multiplayer.ClientLevel;
+import net.minecraft.client.renderer.SkyRenderer;
+import net.minecraft.client.renderer.state.level.SkyRenderState;
+import net.minecraft.world.level.dimension.DimensionType;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.Unique;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.Redirect;
+import org.spongepowered.asm.mixin.injection.ModifyArg;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(SkyRenderer.class)
+public class StaticSkyRendererMixin {
+    @Shadow @Final private RenderTarget renderTarget;
+    @Unique private PortStaticSky rivencraft$staticSky;
+    @Unique private int rivencraft$endTint = -1;
+    @Unique private int rivencraft$orbitBearing = -1;
+    @Unique private float rivencraft$sunSize = 1F;
+    @Unique private int rivencraft$celestialTint = -1;
+    @Unique private int rivencraft$bodyMode;
+    @Unique private java.util.List<StaticSkyState.Body> rivencraft$bodies = java.util.List.of();
+    @Unique private net.dnorberg.rivencraft.client.PortCelestialDiscs rivencraft$discs;
+    @Shadow @Final private net.minecraft.client.renderer.texture.TextureAtlas celestialsAtlas;
+    @Shadow private org.joml.Matrix4f applyCelestialBodyTransform(com.mojang.blaze3d.vertex.PoseStack pose,
+                                                                 float height, float size) { throw new AssertionError(); }
+    @Shadow private void renderSun(com.mojang.renderpearl.api.commands.RenderPass pass, float alpha,
+                                   com.mojang.blaze3d.vertex.PoseStack pose) { throw new AssertionError(); }
+    @Shadow private void renderMoon(com.mojang.renderpearl.api.commands.RenderPass pass,
+                                    net.minecraft.world.level.MoonPhase phase, float alpha,
+                                    com.mojang.blaze3d.vertex.PoseStack pose) { throw new AssertionError(); }
+    @Shadow private void renderStars(com.mojang.renderpearl.api.commands.RenderPass pass, float brightness,
+                                     com.mojang.blaze3d.vertex.PoseStack pose) { throw new AssertionError(); }
+    @Shadow private void renderSunMoonAndStars(com.mojang.renderpearl.api.commands.RenderPass pass,
+                                               com.mojang.blaze3d.vertex.PoseStack pose, float sunAngle,
+                                               float moonAngle, float starAngle, net.minecraft.world.level.MoonPhase phase,
+                                               float alpha, float stars) { throw new AssertionError(); }
+
+    @Inject(method = "extractRenderState", at = @At("TAIL"))
+    private void rivencraft$extract(ClientLevel level, float partialTicks, Camera camera,
+                                    SkyRenderState state, CallbackInfo ci) {
+        boolean enabled = level.dimensionTypeRegistration().unwrapKey().map(key ->
+                key.identifier().getNamespace().equals("rivencraft")
+                && key.identifier().getPath().endsWith("_sky_static")).orElse(false);
+        ((StaticSkyState) state).rivencraft$staticFrame(enabled ? level.getGameTime() / 2 : Long.MIN_VALUE);
+        ((StaticSkyState) state).rivencraft$skyTint(net.dnorberg.rivencraft.age.PortAgeColors.forLevel(level).sky());
+        var cycle = net.dnorberg.rivencraft.age.PortDayCycle.forLevel(level);
+        // 0=native Overworld/no authored overlay, 1=fog-only backdrop,
+        // 2=native End backdrop, 3=custom Static backdrop.
+        int overlay = !cycle.authored() || cycle.bodyMode() == net.dnorberg.rivencraft.age.PortDayCycle.NONE
+                || state.skybox == DimensionType.Skybox.OVERWORLD ? 0
+                : enabled ? 3 : state.skybox == DimensionType.Skybox.NONE ? 1 : 2;
+        ((StaticSkyState) state).rivencraft$bodyOverlay(overlay);
+        ((StaticSkyState) state).rivencraft$orbitBearing(cycle.authored() ? cycle.bearing() : -1);
+        ((StaticSkyState) state).rivencraft$sunSize(cycle.authored() ? cycle.sunSize() : 1F);
+        ((StaticSkyState) state).rivencraft$celestialTint(
+                net.dnorberg.rivencraft.age.PortAgeColors.forLevel(level).celestial());
+        ((StaticSkyState) state).rivencraft$bodyMode(cycle.authored() ? cycle.bodyMode() : 0);
+        // Root's authored Moon always samples the full-moon sprite. Preserve
+        // native calendar phases only for the native Normal Time pair.
+        if (cycle.singleBody() && cycle.bodyMode() == net.dnorberg.rivencraft.age.PortDayCycle.MOON)
+            state.moonPhase = net.minecraft.world.level.MoonPhase.FULL_MOON;
+        var authoredBodies = cycle.bodies();
+        if (authoredBodies.isEmpty() && overlay != 0) {
+            var bodies = new java.util.ArrayList<net.dnorberg.rivencraft.age.PortCelestialBody>();
+            int tint = net.dnorberg.rivencraft.age.PortAgeColors.forLevel(level).celestial();
+            if (cycle.bodyMode() != net.dnorberg.rivencraft.age.PortDayCycle.MOON)
+                bodies.add(net.dnorberg.rivencraft.age.PortCelestialBody.of(cycle, 1, tint, false));
+            if (cycle.bodyMode() != net.dnorberg.rivencraft.age.PortDayCycle.SUN)
+                bodies.add(net.dnorberg.rivencraft.age.PortCelestialBody.of(cycle, 2, tint, cycle.bodyMode() == 0));
+            authoredBodies = java.util.List.copyOf(bodies);
+        }
+        if (authoredBodies.isEmpty()) ((StaticSkyState) state).rivencraft$bodies(java.util.List.of());
+        else {
+            var clock = level.clockManager().getInstance(level.registryAccess().lookupOrThrow(
+                    net.minecraft.core.registries.Registries.WORLD_CLOCK).getOrThrow(net.minecraft.world.clock.WorldClocks.OVERWORLD));
+            double ticks = clock.totalTicks() + clock.partialTick();
+            var sources = authoredBodies;
+            var bodies = sources.stream().map(body -> {
+                float eclipse = body.eclipse(sources, ticks);
+                return new StaticSkyState.Body(body.kind(), body.angle(ticks), body.bearing(), body.size(),
+                        body.eclipseColor(eclipse), eclipse);
+            }).toList();
+            ((StaticSkyState) state).rivencraft$bodies(bodies);
+            float eclipse = 0;
+            for (var body : bodies) if (body.kind() == 1 && Math.cos(Math.toRadians(body.angle())) > 0)
+                eclipse = Math.max(eclipse, body.eclipse());
+            if (state.skybox == DimensionType.Skybox.OVERWORLD) {
+                state.skyColor = new org.joml.Vector3f(state.skyColor).mul(1F - 0.65F * eclipse);
+            } else if (eclipse > 0 && overlay >= 2) {
+                int tint = ((StaticSkyState) state).rivencraft$skyTint();
+                if (tint < 0) tint = enabled ? 0x929292 : 0xffffff;
+                ((StaticSkyState) state).rivencraft$skyTint(rivencraft$shade(tint, 1F - 0.65F * eclipse));
+            }
+        }
+        // Only the extracted presentation uses END to schedule the sky pass. The actual
+        // dimension has NONE, so it never acquires End flashes or End gameplay behavior.
+        if (enabled || overlay == 1) {
+            state.skybox = DimensionType.Skybox.END;
+            state.endFlashIntensity = 0;
+        }
+        if (overlay != 0) state.rainBrightness = 1F - level.getRainLevel(partialTicks);
+    }
+
+    @Unique private static int rivencraft$shade(int rgb, float shade) {
+        return Math.round((rgb >> 16 & 255) * shade) << 16
+                | Math.round((rgb >> 8 & 255) * shade) << 8 | Math.round((rgb & 255) * shade);
+    }
+
+    @Inject(method = "render", at = @At("HEAD"), cancellable = true)
+    private void rivencraft$render(GpuBufferSlice fog, SkyRenderState state, CallbackInfo ci) {
+        long frame = ((StaticSkyState) state).rivencraft$staticFrame();
+        rivencraft$endTint = ((StaticSkyState) state).rivencraft$skyTint();
+        rivencraft$orbitBearing = ((StaticSkyState) state).rivencraft$orbitBearing();
+        rivencraft$sunSize = ((StaticSkyState) state).rivencraft$sunSize();
+        rivencraft$celestialTint = ((StaticSkyState) state).rivencraft$celestialTint();
+        rivencraft$bodyMode = ((StaticSkyState) state).rivencraft$bodyMode();
+        rivencraft$bodies = ((StaticSkyState) state).rivencraft$bodies();
+        if (((StaticSkyState) state).rivencraft$bodyOverlay() == 1) {
+            rivencraft$overlay(fog, state);
+            ci.cancel();
+            return;
+        }
+        if (frame == Long.MIN_VALUE) return;
+        if (rivencraft$staticSky == null) rivencraft$staticSky = new PortStaticSky();
+        rivencraft$staticSky.render(renderTarget, fog, frame, rivencraft$endTint);
+        if (((StaticSkyState) state).rivencraft$bodyOverlay() == 3) rivencraft$overlay(fog, state);
+        ci.cancel();
+    }
+
+    @Inject(method = "render", at = @At("RETURN"))
+    private void rivencraft$afterBackground(GpuBufferSlice fog, SkyRenderState state, CallbackInfo ci) {
+        // RETURN includes the native End branch's early return, after its pass closes.
+        if (((StaticSkyState) state).rivencraft$bodyOverlay() == 2) rivencraft$overlay(fog, state);
+    }
+
+    @Unique private void rivencraft$overlay(GpuBufferSlice fog, SkyRenderState state) {
+        if (rivencraft$bodies.isEmpty()) return;
+        com.mojang.blaze3d.systems.RenderSystem.setShaderFog(fog);
+        try (var pass = com.mojang.blaze3d.systems.RenderSystem.getDevice().createCommandEncoder().createRenderPass(
+                () -> "Rivencraft celestial overlay", renderTarget.getColorTextureView(), java.util.Optional.empty(),
+                renderTarget.getDepthTextureView(), java.util.OptionalDouble.empty())) {
+            renderSunMoonAndStars(pass, new com.mojang.blaze3d.vertex.PoseStack(), 0, 0, 0,
+                    net.minecraft.world.level.MoonPhase.FULL_MOON, state.rainBrightness, 0);
+        }
+    }
+
+    @Inject(method = "renderSunMoonAndStars", at = @At("HEAD"), cancellable = true)
+    private void rivencraft$drawBodies(com.mojang.renderpearl.api.commands.RenderPass pass,
+                                       com.mojang.blaze3d.vertex.PoseStack pose, float sunAngle,
+                                       float moonAngle, float starAngle, net.minecraft.world.level.MoonPhase phase,
+                                       float alpha, float stars, CallbackInfo ci) {
+        if (rivencraft$bodies.isEmpty()) return;
+        int savedMode = rivencraft$bodyMode, savedTint = rivencraft$celestialTint;
+        float savedSize = rivencraft$sunSize;
+        try {
+            // Stars belong behind opaque discs, not on top of a dark eclipsing moon.
+            if (stars > 0) {
+                pose.pushPose();
+                try {
+                    pose.rotateDegrees(com.mojang.math.Axis.YP, -90);
+                    pose.rotate(com.mojang.math.Axis.XP, starAngle);
+                    renderStars(pass, stars, pose);
+                } finally { pose.popPose(); }
+            }
+            // Same ordering as 1.21.1: all suns, then all moons; each opaque
+            // central disc is drawn after its transparent glow.
+            for (int kind = 1; kind <= 2; kind++) for (var body : rivencraft$bodies) {
+                if (body.kind() != kind) continue;
+                rivencraft$bodyMode = kind;
+                rivencraft$celestialTint = body.color();
+                rivencraft$sunSize = body.size();
+                pose.pushPose();
+                try {
+                    pose.rotateDegrees(com.mojang.math.Axis.YP, body.bearing() < 0 ? -90 : body.bearing());
+                    pose.rotateDegrees(com.mojang.math.Axis.XP, body.angle());
+                    float glowAlpha = alpha * (kind == 1 ? 0.84F : 0.88F + 0.12F * body.eclipse());
+                    var bodyPhase = net.minecraft.world.level.MoonPhase.FULL_MOON;
+                    if (kind == 1) renderSun(pass, glowAlpha, pose); else renderMoon(pass, bodyPhase, glowAlpha, pose);
+                    if (rivencraft$discs == null) rivencraft$discs = new net.dnorberg.rivencraft.client.PortCelestialDiscs();
+                    // Both passes must use the same sprite. Native dark phase pixels
+                    // become black patches under ordinary alpha, unlike the old glow-only pass.
+                    var transform = applyCelestialBodyTransform(pose, 100F, (kind == 1 ? 30F : 20F) * body.size());
+                    rivencraft$discs.draw(pass, celestialsAtlas, kind == 2, bodyPhase, transform, body.color(), alpha);
+                } finally { pose.popPose(); }
+            }
+        } finally {
+            rivencraft$bodyMode = savedMode;
+            rivencraft$celestialTint = savedTint;
+            rivencraft$sunSize = savedSize;
+        }
+        ci.cancel();
+    }
+
+    @ModifyArg(method = "renderSunMoonAndStars", at = @At(value = "INVOKE", target =
+            "Lcom/mojang/blaze3d/vertex/PoseStack;rotateDegrees(Lcom/mojang/math/Axis;F)V", ordinal = 0), index = 1)
+    private float rivencraft$orbitAngle(float nativeBearing) {
+        return rivencraft$orbitBearing < 0 ? nativeBearing : rivencraft$orbitBearing;
+    }
+
+    @ModifyArg(method = "renderSun", at = @At(value = "INVOKE", target =
+            "Lnet/minecraft/client/renderer/SkyRenderer;applyCelestialBodyTransform(Lcom/mojang/blaze3d/vertex/PoseStack;FF)Lorg/joml/Matrix4f;"), index = 2)
+    private float rivencraft$scaleSun(float nativeSize) {
+        // 1.21.1 Normal Time applies Size to its sun; its paired moon remains 1x.
+        return nativeSize * rivencraft$sunSize;
+    }
+
+    @ModifyArg(method = "renderMoon", at = @At(value = "INVOKE", target =
+            "Lnet/minecraft/client/renderer/SkyRenderer;applyCelestialBodyTransform(Lcom/mojang/blaze3d/vertex/PoseStack;FF)Lorg/joml/Matrix4f;"), index = 2)
+    private float rivencraft$scaleMoon(float nativeSize) {
+        return rivencraft$bodyMode == net.dnorberg.rivencraft.age.PortDayCycle.MOON
+                ? nativeSize * rivencraft$sunSize : nativeSize;
+    }
+
+    @Inject(method = "renderSun", at = @At("HEAD"), cancellable = true)
+    private void rivencraft$hideSun(com.mojang.renderpearl.api.commands.RenderPass pass, float alpha,
+                                    com.mojang.blaze3d.vertex.PoseStack pose, CallbackInfo ci) {
+        if (rivencraft$bodyMode == net.dnorberg.rivencraft.age.PortDayCycle.MOON
+                || rivencraft$bodyMode == net.dnorberg.rivencraft.age.PortDayCycle.NONE) ci.cancel();
+    }
+
+    @Inject(method = "renderMoon", at = @At("HEAD"), cancellable = true)
+    private void rivencraft$hideMoon(com.mojang.renderpearl.api.commands.RenderPass pass,
+                                     net.minecraft.world.level.MoonPhase phase, float alpha,
+                                     com.mojang.blaze3d.vertex.PoseStack pose, CallbackInfo ci) {
+        if (rivencraft$bodyMode == net.dnorberg.rivencraft.age.PortDayCycle.SUN
+                || rivencraft$bodyMode == net.dnorberg.rivencraft.age.PortDayCycle.NONE) ci.cancel();
+    }
+
+    @ModifyArg(method = {"renderSun", "renderMoon"}, at = @At(value = "INVOKE", target =
+            "Lnet/minecraft/client/renderer/DynamicGpuData;writeTransform(Lorg/joml/Matrix4f;Lorg/joml/Vector4f;)Lcom/mojang/renderpearl/api/buffers/GpuBufferSlice;"), index = 1)
+    private org.joml.Vector4f rivencraft$tintCelestial(org.joml.Vector4f nativeColor) {
+        // Normal Time consumes one shared color group for its sun and moon in 1.21.1.
+        // Keep native alpha (including weather fading) and the sprite's transparent halo.
+        if (rivencraft$celestialTint < 0) return nativeColor;
+        var tint = net.dnorberg.rivencraft.age.PortAgeColors.vector(rivencraft$celestialTint);
+        return new org.joml.Vector4f(nativeColor.x * tint.x(), nativeColor.y * tint.y(),
+                nativeColor.z * tint.z(), nativeColor.w);
+    }
+
+    @Inject(method = "renderSunriseAndSunset", at = @At("HEAD"), cancellable = true)
+    private void rivencraft$rotateHorizon(com.mojang.renderpearl.api.commands.RenderPass pass,
+                                         com.mojang.blaze3d.vertex.PoseStack pose, float angle,
+                                         org.joml.Vector4fc color, CallbackInfo ci) {
+        if (rivencraft$bodyMode == net.dnorberg.rivencraft.age.PortDayCycle.MOON
+                || rivencraft$bodyMode == net.dnorberg.rivencraft.age.PortDayCycle.NONE) {
+            ci.cancel();
+            return;
+        }
+        if (rivencraft$orbitBearing < 0) return;
+        pose.pushPose();
+        pose.rotateDegrees(com.mojang.math.Axis.YP, rivencraft$orbitBearing + 90);
+    }
+
+    @Inject(method = "renderSunriseAndSunset", at = @At("TAIL"))
+    private void rivencraft$restoreHorizon(com.mojang.renderpearl.api.commands.RenderPass pass,
+                                          com.mojang.blaze3d.vertex.PoseStack pose, float angle,
+                                          org.joml.Vector4fc color, CallbackInfo ci) {
+        if (rivencraft$bodyMode != net.dnorberg.rivencraft.age.PortDayCycle.MOON
+                && rivencraft$bodyMode != net.dnorberg.rivencraft.age.PortDayCycle.NONE
+                && rivencraft$orbitBearing >= 0) pose.popPose();
+    }
+
+    @Redirect(method = "renderEndSky", at = @At(value = "INVOKE", target =
+            "Lnet/minecraft/client/renderer/DynamicGpuData;writeTransform(Lorg/joml/Matrix4f;)Lcom/mojang/renderpearl/api/buffers/GpuBufferSlice;"))
+    private GpuBufferSlice rivencraft$endColor(net.minecraft.client.renderer.DynamicGpuData uniforms,
+                                               org.joml.Matrix4f matrix) {
+        return rivencraft$endTint < 0 ? uniforms.writeTransform(matrix) : uniforms.writeTransform(matrix,
+                new org.joml.Vector4f(net.dnorberg.rivencraft.age.PortAgeColors.vector(rivencraft$endTint), 1));
+    }
+
+    @Inject(method = "close", at = @At("HEAD"))
+    private void rivencraft$close(CallbackInfo ci) {
+        if (rivencraft$discs != null) {
+            rivencraft$discs.close();
+            rivencraft$discs = null;
+        }
+        if (rivencraft$staticSky != null) {
+            rivencraft$staticSky.close();
+            rivencraft$staticSky = null;
+        }
+    }
+}

ports/mc263/src/main/java/net/dnorberg/rivencraft/mixin/StaticSkyStateMixin.java

@@ -0,0 +1,49 @@
+package net.dnorberg.rivencraft.mixin;
+
+import net.dnorberg.rivencraft.client.StaticSkyState;
+import net.minecraft.client.renderer.state.level.SkyRenderState;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Unique;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(SkyRenderState.class)
+public class StaticSkyStateMixin implements StaticSkyState {
+    @Unique private long rivencraft$frame = Long.MIN_VALUE;
+    @Unique private int rivencraft$tint = -1;
+    @Unique private int rivencraft$bearing = -1;
+    @Unique private float rivencraft$sunSize = 1F;
+    @Unique private int rivencraft$celestialTint = -1;
+    @Unique private int rivencraft$bodyMode;
+    @Unique private int rivencraft$bodyOverlay;
+    public int rivencraft$bodyOverlay() { return rivencraft$bodyOverlay; }
+    public void rivencraft$bodyOverlay(int mode) { rivencraft$bodyOverlay = mode; }
+    @Unique private java.util.List<StaticSkyState.Body> rivencraft$bodies = java.util.List.of();
+    public java.util.List<StaticSkyState.Body> rivencraft$bodies() { return rivencraft$bodies; }
+    public void rivencraft$bodies(java.util.List<StaticSkyState.Body> bodies) { rivencraft$bodies = java.util.List.copyOf(bodies); }
+    public long rivencraft$staticFrame() { return rivencraft$frame; }
+    public void rivencraft$staticFrame(long frame) { rivencraft$frame = frame; }
+    public int rivencraft$skyTint() { return rivencraft$tint; }
+    public void rivencraft$skyTint(int color) { rivencraft$tint = color; }
+    public int rivencraft$orbitBearing() { return rivencraft$bearing; }
+    public void rivencraft$orbitBearing(int bearing) { rivencraft$bearing = bearing; }
+    public float rivencraft$sunSize() { return rivencraft$sunSize; }
+    public void rivencraft$sunSize(float size) { rivencraft$sunSize = size; }
+    public int rivencraft$celestialTint() { return rivencraft$celestialTint; }
+    public void rivencraft$celestialTint(int color) { rivencraft$celestialTint = color; }
+    public int rivencraft$bodyMode() { return rivencraft$bodyMode; }
+    public void rivencraft$bodyMode(int mode) { rivencraft$bodyMode = mode; }
+
+    @Inject(method = "reset", at = @At("TAIL"))
+    private void rivencraft$reset(CallbackInfo ci) {
+        rivencraft$frame = Long.MIN_VALUE;
+        rivencraft$tint = -1;
+        rivencraft$bearing = -1;
+        rivencraft$sunSize = 1F;
+        rivencraft$celestialTint = -1;
+        rivencraft$bodyMode = 0;
+        rivencraft$bodyOverlay = 0;
+        rivencraft$bodies = java.util.List.of();
+    }
+}

ports/mc263/src/main/java/net/dnorberg/rivencraft/network/PortBookNetworking.java

@@ -108,9 +108,10 @@ public final class PortBookNetworking {
 
     public static Identifier createAge(ServerPlayer player, String title, List<Identifier> pages) {
         if (title == null || title.isBlank() || title.length() > MAX_BOOK_TITLE_LENGTH) return null;
+        long seed = player.getRandom().nextLong();
         net.dnorberg.rivencraft.age.PortBiomePlan biomePlan;
         try {
-            biomePlan = PortAuthoredWriting.biomePlan(pages, player.registryAccess());
+            biomePlan = PortAuthoredWriting.biomePlan(pages, player.level().getServer(), seed);
         } catch (IllegalArgumentException exception) {
             player.sendOverlayMessage(Component.literal("Age writing unavailable: " + exception.getMessage()));
             return null;
@@ -127,20 +128,25 @@ public final class PortBookNetworking {
             id = Identifier.fromNamespaceAndPath(Rivencraft.MOD_ID, "age/" + name);
         }
         try {
-            long seed = player.getRandom().nextLong();
             PortAgeTerrain terrain = PortAuthoredWriting.terrain(pages);
             if (pages.isEmpty()) {
                 PortRandomAgeSelection.Selection random = PortRandomAgeSelection.select(server, seed);
                 terrain = random.terrain();
                 biomePlan = random.biomes();
             }
+            var environment = net.dnorberg.rivencraft.age.PortEnvironmentSelection.resolve(pages, seed, terrain);
+            var randomFeatures = pages.isEmpty()
+                    ? net.dnorberg.rivencraft.age.PortRandomFeatureSelection.select(server, seed, terrain, biomePlan) : null;
             RuntimeAgeBackend.create(server, id, seed, biomePlan, terrain,
-                    PortAuthoredWriting.rockPlan(pages, seed),
+                    randomFeatures == null ? PortAuthoredWriting.rockPlan(pages, seed) : randomFeatures.rocks(),
                     PortAuthoredWriting.vegetationPlan(pages),
-                    PortAuthoredWriting.dungeonCount(pages),
-                    PortAuthoredWriting.lakePlan(pages, seed),
-                    PortAuthoredWriting.terrainFeaturePlan(pages, seed),
-                    net.dnorberg.rivencraft.age.PortWeatherMode.fromPages(pages));
+                    randomFeatures == null ? PortAuthoredWriting.dungeonCount(pages) : randomFeatures.dungeons(),
+                    randomFeatures == null ? PortAuthoredWriting.lakePlan(pages, seed) : randomFeatures.lakes(),
+                    randomFeatures == null ? PortAuthoredWriting.terrainFeaturePlan(pages, seed) : randomFeatures.terrain(),
+                    environment.weather(), environment.lighting(), environment.sky(),
+                    net.dnorberg.rivencraft.age.PortAgeColors.resolve(pages, seed),
+                    net.dnorberg.rivencraft.age.PortDayCycle.resolve(pages, seed,
+                            net.dnorberg.rivencraft.age.PortDayCycle.nativeTicks(server.overworld())));
         } catch (IllegalArgumentException | IllegalStateException exception) {
             player.sendOverlayMessage(Component.literal("Age creation failed: " + exception.getMessage()));
             return null;

ports/mc263/src/main/java/net/dnorberg/rivencraft/writing/PortAuthoredWriting.java

@@ -15,6 +15,8 @@ import net.dnorberg.rivencraft.age.PortTerrainFeaturePlan;
 import net.dnorberg.rivencraft.age.PortStructurePages;
 import net.dnorberg.rivencraft.age.PortCarverPages;
 import net.dnorberg.rivencraft.age.PortWeatherMode;
+import net.dnorberg.rivencraft.age.PortLighting;
+import net.dnorberg.rivencraft.age.PortSkyStyle;
 import net.dnorberg.rivencraft.Rivencraft;
 import net.minecraft.core.HolderLookup;
 import net.minecraft.core.registries.Registries;
@@ -53,7 +55,10 @@ public final class PortAuthoredWriting {
         if (page == null || !page.getNamespace().equals(Rivencraft.MOD_ID)) return false;
         var entry = PortSymbolPages.find(page);
         if (entry == null) return false;
-        if (isTerrain(page) || controller(page) != null || PortWeatherMode.forPage(page) != null) return true;
+        if (net.dnorberg.rivencraft.age.PortAgeColors.isModifier(page)
+                || net.dnorberg.rivencraft.age.PortDayCycle.supports(page)) return true;
+        if (isTerrain(page) || controller(page) != null || PortWeatherMode.forPage(page) != null
+                || PortLighting.forPage(page) != null || PortSkyStyle.forPage(page) != null) return true;
         if (entry.category().equals("rivencraft:biome") && PortRegistryPages.biomeId(page) != null) return true;
         if (isBlockPage(page) && (entry.category().equals("rivencraft:block")
                 || entry.category().equals("rivencraft:fluid"))) return true;
@@ -67,6 +72,14 @@ public final class PortAuthoredWriting {
 
     /** A page never disappears into an Age unless this port can apply its effect. */
     public static boolean supports(List<Identifier> pages) {
+        try {
+            return supportsExplicit(PortMaterialCompletion.complete(pages, 0));
+        } catch (IllegalArgumentException exception) { return false; }
+    }
+
+    private static boolean supportsExplicit(List<Identifier> pages) {
+        if (!net.dnorberg.rivencraft.age.PortAgeColors.validNumbers(pages)) return false;
+        if (!net.dnorberg.rivencraft.age.PortDayCycle.validWriting(pages)) return false;
         boolean terrain = false;
         int biomes = 0;
         int controllers = 0;
@@ -79,6 +92,8 @@ public final class PortAuthoredWriting {
         int denseOres = 0;
         int starFissures = 0;
         int weather = 0;
+        int lighting = 0;
+        int sky = 0;
         Map<Identifier, Integer> terrainFeatures = new HashMap<>();
         Map<Identifier, Integer> structures = new HashMap<>();
         Map<Identifier, Integer> carvers = new HashMap<>();
@@ -86,12 +101,19 @@ public final class PortAuthoredWriting {
             if (pendingMaterial != null && !(pendingMaterial.equals("rivencraft:block")
                     && (page.equals(ROCKS) || PortTerrainFeaturePlan.acceptsMaterial(page))
                     || pendingMaterial.equals("rivencraft:fluid") && PortLakePlan.isLake(page))) return false;
-            if (isTerrain(page) && !terrain) {
+            if (net.dnorberg.rivencraft.age.PortAgeColors.isModifier(page)
+                    || net.dnorberg.rivencraft.age.PortDayCycle.supports(page)) {
+                // Shared colors target Sky, Ambient Light Color or Normal Time; trailing colors tint the sky.
+            } else if (isTerrain(page) && !terrain) {
                 terrain = true;
+            } else if (PortSkyStyle.forPage(page) != null && sky++ == 0) {
+                // Sky presentation, independent of terrain and illumination.
+            } else if (PortLighting.forPage(page) != null && lighting++ == 0) {
+                // A single lighting controller; omitted choices resolve from the Age seed.
             } else if (PortWeatherMode.forPage(page) != null && weather++ == 0) {
                 // A single independent weather policy for this Age.
             } else if (controller(page) != null && controllers++ == 0) {
-                // An explicit controller needs an authored pool.
+                // Missing biome slots are seed-completed when the Age is created.
             } else if (isBlockPage(page) && pendingMaterial == null
                     && PortSymbolPages.find(page) != null
                     && (PortSymbolPages.find(page).category().equals("rivencraft:block")
@@ -136,7 +158,8 @@ public final class PortAuthoredWriting {
         }
         if (pendingMaterial != null || (rocks > 0 || pages.stream().anyMatch(PortVegetationPlan::requiresSurface))
                 && (pages.contains(CAVE_TERRAIN) || pages.contains(VOID_TERRAIN))) return false;
-        if ((dungeons > 0 || lakes > 0) && (pages.contains(FLAT_TERRAIN) || pages.contains(VOID_TERRAIN)
+        if (dungeons > 0 && (pages.contains(FLAT_TERRAIN) || pages.contains(VOID_TERRAIN))) return false;
+        if (lakes > 0 && (pages.contains(FLAT_TERRAIN) || pages.contains(VOID_TERRAIN)
                 || pages.contains(CAVE_TERRAIN))) return false;
         if (denseOres > 0 && (pages.contains(FLAT_TERRAIN) || pages.contains(VOID_TERRAIN))) return false;
         if (!carvers.isEmpty() && (pages.contains(FLAT_TERRAIN) || pages.contains(VOID_TERRAIN))) return false;
@@ -153,8 +176,8 @@ public final class PortAuthoredWriting {
                     .filter(value -> value != null).findFirst().orElseThrow();
             boolean valid = switch (distribution) {
                 case NATIVE -> biomes == 0;
-                case SINGLE -> biomes == 1;
-                default -> biomes >= 2;
+                case SINGLE -> biomes <= 1;
+                default -> true;
             };
             return valid;
         }
@@ -198,13 +221,14 @@ public final class PortAuthoredWriting {
     }
 
     public static PortRockPlan rockPlan(List<Identifier> pages, long seed) {
-        if (!supports(pages)) throw new IllegalArgumentException("Unsupported authored Age pages");
+        pages = completedMaterials(pages, seed);
         List<Identifier> materials = solidMaterials(pages, seed, ROCKS);
         return materials.isEmpty() ? null : new PortRockPlan(materials);
     }
 
     public static PortTerrainFeaturePlan terrainFeaturePlan(List<Identifier> pages, long seed) {
-        if (!supports(pages)) throw new IllegalArgumentException("Unsupported authored Age pages");
+        pages = completedMaterials(pages, seed);
+        final List<Identifier> completed = pages;
         Map<Identifier, List<Identifier>> materials = new HashMap<>();
         Map<Identifier, Integer> occurrences = new HashMap<>();
         List<PortTerrainFeaturePlan.Choice> choices = new ArrayList<>();
@@ -214,7 +238,7 @@ public final class PortAuthoredWriting {
                 choices.add(new PortTerrainFeaturePlan.Choice(page, PortTerrainFeaturePlan.CRYSTAL_MATERIAL));
                 continue;
             }
-            List<Identifier> selected = materials.computeIfAbsent(page, feature -> solidMaterials(pages, seed, feature));
+            List<Identifier> selected = materials.computeIfAbsent(page, feature -> solidMaterials(completed, seed, feature));
             int occurrence = occurrences.merge(page, 1, Integer::sum) - 1;
             choices.add(new PortTerrainFeaturePlan.Choice(page, selected.get(occurrence)));
         }
@@ -246,7 +270,7 @@ public final class PortAuthoredWriting {
     }
 
     public static PortLakePlan lakePlan(List<Identifier> pages, long seed) {
-        if (!supports(pages)) throw new IllegalArgumentException("Unsupported authored Age pages");
+        pages = completedMaterials(pages, seed);
         if (pages.stream().noneMatch(PortLakePlan::isLake)) return null;
         List<Identifier> fluidPool = PortRegistryPages.fluidMaterialIds();
         if (fluidPool.isEmpty()) throw new IllegalStateException("No source-fluid materials are registered");
@@ -272,6 +296,12 @@ public final class PortAuthoredWriting {
         return new PortLakePlan(choices);
     }
 
+    private static List<Identifier> completedMaterials(List<Identifier> pages, long seed) {
+        var completed = PortMaterialCompletion.complete(pages, seed);
+        if (!supportsExplicit(completed)) throw new IllegalArgumentException("Unsupported authored Age pages");
+        return completed;
+    }
+
     public static PortVegetationPlan vegetationPlan(List<Identifier> pages) {
         if (!supports(pages)) throw new IllegalArgumentException("Unsupported authored Age pages");
         List<Identifier> vegetation = pages.stream().filter(PortVegetationPlan::isVegetation).toList();
@@ -291,6 +321,17 @@ public final class PortAuthoredWriting {
 
     /** Resolves all authored biomes from the active registry before creating a level. */
     public static PortBiomePlan biomePlan(List<Identifier> pages, HolderLookup.Provider registries) {
+        return biomePlan(pages, registries, 0, null);
+    }
+
+    /** Creation-only completion; the saved plan never rerolls on load or reseed. */
+    public static PortBiomePlan biomePlan(List<Identifier> pages, net.minecraft.server.MinecraftServer server, long seed) {
+        return biomePlan(pages, server.registryAccess(), seed,
+                net.dnorberg.rivencraft.age.PortRandomAgeSelection.eligibleBiomes(server, terrain(pages)));
+    }
+
+    private static PortBiomePlan biomePlan(List<Identifier> pages, HolderLookup.Provider registries,
+                                          long seed, List<Identifier> available) {
         if (!supports(pages)) throw new IllegalArgumentException(
                 "Unsupported terrain or biome-page combination in this port slice");
         List<Identifier> biomes = new ArrayList<>();
@@ -325,6 +366,25 @@ public final class PortAuthoredWriting {
             throw new IllegalArgumentException("Dense Ores needs at least one biome with registered ore placements");
         if (distribution == PortBiomePlan.Distribution.NATIVE)
             return new PortBiomePlan(distribution, List.of());
+        if (distribution != null && available != null) {
+            int minimum = distribution == PortBiomePlan.Distribution.SINGLE ? 1 : 2;
+            int target = minimum;
+            if (biomes.isEmpty() && distribution != PortBiomePlan.Distribution.SINGLE) {
+                var random = new Random(seed ^ 0x42494F4D45434F55L);
+                while (target < available.size() && random.nextInt(3) != 0) target++;
+            }
+            var distinct = new java.util.HashSet<>(biomes);
+            // Void may retain authored weather/season biomes, but must not gain
+            // an unrequested The Void biome just to fill a multi-biome controller.
+            var filler = new ArrayList<>(pages.contains(VOID_TERRAIN) && !biomes.isEmpty() ? List.<Identifier>of() : available);
+            Collections.shuffle(filler, new Random(seed ^ 0x42494F4D45504F4FL));
+            for (Identifier biome : filler) {
+                if (distinct.size() >= target) break;
+                if (distinct.add(biome)) biomes.add(biome);
+            }
+            if (distinct.size() < minimum) throw new IllegalArgumentException(
+                    distribution + " requires " + minimum + " distinct biomes; supply more biome pages for this terrain");
+        }
         if (biomes.isEmpty()) return null;
         if (distribution == null) distribution = biomes.size() == 1
                 ? PortBiomePlan.Distribution.SINGLE : biomes.size() == 2

ports/mc263/src/main/java/net/dnorberg/rivencraft/writing/PortMaterialCompletion.java

@@ -0,0 +1,68 @@
+package net.dnorberg.rivencraft.writing;
+
+import java.util.ArrayList;
+import java.util.List;
+import net.dnorberg.rivencraft.age.PortCarverPages;
+import net.dnorberg.rivencraft.age.PortLakePlan;
+import net.dnorberg.rivencraft.age.PortStructurePages;
+import net.dnorberg.rivencraft.age.PortTerrainFeaturePlan;
+import net.dnorberg.rivencraft.age.PortVegetationPlan;
+import net.minecraft.resources.Identifier;
+
+/** Creation-time implied features, adapted from 1.21.1 AgeFeatureSelection. */
+public final class PortMaterialCompletion {
+    private PortMaterialCompletion() {}
+
+    public static List<Identifier> complete(List<Identifier> pages, long seed) {
+        var result = new ArrayList<Identifier>();
+        for (int index = 0; index < pages.size(); index++) {
+            Identifier page = pages.get(index);
+            result.add(page);
+            var entry = PortSymbolPages.find(page);
+            if (entry == null || !(entry.category().equals("rivencraft:block")
+                    || entry.category().equals("rivencraft:fluid"))) continue;
+            if (index + 1 < pages.size() && isFeature(pages.get(index + 1))) continue;
+            Identifier material = PortRegistryPages.blockId(page);
+            var candidates = candidates(pages, entry.category().equals("rivencraft:fluid"));
+            if (candidates.isEmpty()) throw new IllegalArgumentException(
+                    "No compatible feature for material " + material + " on this terrain");
+            long mixed = mix(seed ^ (long) material.hashCode() * 0x9E3779B97F4A7C15L ^ index);
+            result.add(candidates.get(Math.floorMod(mixed, candidates.size())));
+        }
+        return List.copyOf(result);
+    }
+
+    private static List<Identifier> candidates(List<Identifier> pages, boolean fluid) {
+        boolean cave = pages.contains(id("terrain/cave"));
+        boolean empty = pages.contains(id("terrain/void"));
+        boolean flat = pages.contains(id("terrain/flat"));
+        if (fluid) return cave || empty || flat ? List.of()
+                : List.of(id("feature/surface_lakes"), id("feature/deep_lakes"), id("feature/lava_lakes"));
+        var choices = new ArrayList<Identifier>();
+        if (!cave && !empty && !flat) choices.add(id("feature/rocks"));
+        if (!cave) choices.add(PortTerrainFeaturePlan.FLOATING_ISLANDS);
+        choices.add(PortTerrainFeaturePlan.TENDRILS);
+        choices.add(PortTerrainFeaturePlan.SPHERES);
+        if (!cave && !empty) {
+            choices.add(PortTerrainFeaturePlan.SPIKES);
+            choices.add(PortTerrainFeaturePlan.OBELISKS);
+        }
+        return choices;
+    }
+
+    private static boolean isFeature(Identifier page) {
+        return PortTerrainFeaturePlan.isSupported(page) || PortLakePlan.isLake(page)
+                || PortVegetationPlan.isVegetation(page) || PortStructurePages.supports(page)
+                || PortCarverPages.supports(page) || page.equals(id("feature/rocks"))
+                || page.equals(id("feature/dungeons")) || page.equals(PortTerrainFeaturePlan.SKYLANDS)
+                || page.equals(PortTerrainFeaturePlan.DENSE_ORES) || page.equals(PortTerrainFeaturePlan.STAR_FISSURES);
+    }
+
+    private static Identifier id(String path) { return Identifier.fromNamespaceAndPath("rivencraft", path); }
+
+    private static long mix(long value) {
+        value = (value ^ value >>> 30) * 0xBF58476D1CE4E5B9L;
+        value = (value ^ value >>> 27) * 0x94D049BB133111EBL;
+        return value ^ value >>> 31;
+    }
+}

ports/mc263/src/main/resources/data/rivencraft/rivencraft/symbols/lighting/ambient_color.json

@@ -0,0 +1 @@
+{"schema_version":2,"name":"symbol.rivencraft.lighting.ambient_color","description":"symbol.rivencraft.lighting.ambient_color.description","category":"rivencraft:lighting","poem":"Ethereal Red Sustain Balance"}

ports/mc263/src/main/resources/rivencraft.mixins.json

@@ -3,6 +3,7 @@
   "minVersion": "0.8",
   "package": "net.dnorberg.rivencraft.mixin",
   "compatibilityLevel": "JAVA_25",
-  "mixins": ["StructurePlacementAccessor", "AgeStructureBiomeMixin", "AgeCarversMixin"],
+  "mixins": ["StructurePlacementAccessor", "AgeStructureBiomeMixin", "AgeCarversMixin", "AgeAmbientLightMixin", "AgeColorAttributesMixin", "AgeDayTimelineMixin"],
+  "client": ["StaticSkyStateMixin", "StaticSkyRendererMixin"],
   "injectors": {"defaultRequire": 1}
 }