Release 26.3.0.1 with live Reborn views and random page policies

2026-11-11 17:15:46 -05:00
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 # Minecraft 26.3 beta port workspace

-This is an **experimental beta port** for issues #97–#104, not gameplay parity
-with the Minecraft 1.21.1 release. The 26.3 backend persists separate Ages and
-their seeds. Books, lectern book stands, the Book Binder, Ink Mixer, Writing Desk and page collections
-are ported, 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 and lighting, multiple authored or seeded celestial
-bodies and eclipses, biome/material completion, and random features/structures.
-Crystal portals and libraries are ported. Instability scoring/provider selection,
-status effects, colored decay, lightning, explosions, meteors, burning and erosion,
-ordered writing recovery, live material profiling and all six Link Modifier controls are now ported.
-Seed editing, operator-confirmed Age retirement and creation rollback are included.
-JEI, TerraBlender/Biomes O' Plenty, Serene Seasons/GlitchCore and Ruins are optional
-integrations. Live previews, remaining discovery/configuration parity and the final
-multiplayer regression remain unfinished. The latest published beta is
-[1.0.1.136-beta.1](RELEASE_NOTES_1.0.1.136-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 current **Minecraft 26.3 release is 26.3.0.1**, for NeoForge 26.3.0.99 and
+Java 25. It uses Rivencraft's first-party Age backend, with no Dynamic Dimensions
+or Bad Packets dependency. The writing loop, authored/seeded Ages, generation
+features, weather/skies/celestials, libraries, crystal portals, live instability,
+and Link Modifier controls are ported. JEI, TerraBlender/Biomes O' Plenty, Serene
+Seasons/GlitchCore and Ruins are optional.
+
+Immersive Portals Reborn 7.0.12 optionally supplies rotating live book previews
+and continuous crystal portal views. Built-in animations and normal travel remain
+available without it. Random-page eligibility and glyph descriptions are included.
+Use one portal fork per instance. The server controls crystal live views through
+`book_previews.reborn_crystal_live_views`; clients can disable live book views
+with `book_previews.reborn_live_views` in `rivencraft-local.toml`.
+Reborn's Static Sky rendering issue remains tracked in
+[#116](https://git.paddedcell.org/dnorberg/rivencraft/issues/116).
+
+This regular release is player-validated but does not claim complete 1.21.1 parity.
+Issues #100, #103 and #104 retain the final multiplayer/parity/release-workflow
+checks. Preview exploration controls and Create/Ponder scenes remain unported.
+Use matching client/server builds, keep saves separate from 1.21.1 and back up
+before updating. See [release notes](RELEASE_NOTES_26.3.0.1.md).

 The entries below record how the port was built, including earlier alpha-only
 limitations that were addressed by later slices.
@@ -2801,3 +2804,232 @@ filtering, both dimension gates, spawn-event veto, and a real Tiki Head placemen
 retained the counts. Temporary fixtures and test worlds were removed; test servers
 were stopped. Client glyph/GUI checks and natural spawning while exploring an Age
 remain player validation. No commit, push, or publication; #102 remains open.
+
+
+### Random Page eligibility and library discovery — 1.0.1.137-beta.1
+
+The player passed .136 and authorized its publication. This slice adapts 1.21.1's
+RandomPagePolicy and random_pages allowlist/blocklist. Short paths (sky/static)
+and fully namespaced Page IDs are accepted; blocklist wins, and allowlist entries
+restrict only their own categories. Biome controllers are a separate category
+from individual biomes. Creative/JEI availability and manual book authoring are
+not filtered.
+
+Normal Link-Panel-only book creation takes one immutable policy snapshot and
+passes it through terrain, biome distribution/Page completion, environment,
+celestial kinds, material features/materials, optional formations and structures.
+Seasons use the same snapshot before their saved policy is committed. Resolved
+choices are already frozen in Age index/season data, so reload/reseed never reads
+the current lists to reselect an old Age. Authored and partly authored books use
+the existing unrestricted completion behavior, matching the 1.21.1 boundary.
+
+Required empty categories use Standard terrain, Native distribution, Normal
+lighting/weather, inherited Overworld sky, or No Seasons. Optional features or
+materials with no candidates are omitted, not filled with a forbidden random
+Page. Non-Native biome distributions preserve their required minimum using the
+terrain's preferred/native fallback pool; necessary fallback biomes can therefore
+bypass a filter. Native noise biomes come from the preset, not biome Page selection,
+and remain unfiltered just as in 1.21.1. Void still has its required Void biome.
+Cave weather/season safety overrides remain unchanged. Original unrestricted
+terrain/distribution seed choices are unchanged; filtered ranks are recalculated
+using the shared Legacy rank chooser instead of a duplicate weighted routine.
+
+Newly placed direct library Pages apply the current policy in both LEGACY and
+AGE_ONLY modes. Existing inventory contents are not rewritten. The Legacy library
+pool now includes exact Ruins templates and semantic bundled pages rather than
+reusing the Sealed Notebook's narrower pool. Sealed Notebook opening retains its
+1.21.1 pool behavior; this setting does not retroactively edit unopened/old loot.
+No policy filtering is applied to JEI or creative portfolios.
+
+Build passed. A disposable no-optional dedicated server passed 766 creation/policy
+checks over 48 seeds and six restart checks: normal book binding, manual blocked
+Page authoring, immutable saved settings under a changed policy, unload/reload,
+required category/biome fallbacks, optional empty pools, material eligibility,
+Native distinction, season policies without requiring Serene classes, library
+filtering and unchanged Creative entries. The later rank revision added default
+seed-compatibility and minimum-biome checks. These are temporary fixtures, not
+new permanent game tests. Worlds and fixtures removed, servers stopped, production
+JAR rebuilt. Player config/GUI/world validation remains pending. No commit, push
+or publication.
+
+
+### Random-Age book glyph prose — 1.0.1.138-beta.1
+
+The player passed the .137 eligibility slice. Ported 1.21.1's first-page random-Age
+glyph description: the Age name and author remain ordinary text on the left,
+followed by layered Legacy word glyphs and real base-25 numerals for terrain,
+distribution, lighting, weather and the first celestial cycle's period/angle/phase.
+Authored books keep their existing name/author front page and single-symbol middle
+pages; no writing notes or instability scores are introduced. The right-side
+animated link panel and its click-to-travel behavior are unchanged.
+
+The existing symbolcomponents.png atlas and deterministic word mappings are reused
+directly with tinted GUI_TEXTURED blits; no generated art or per-frame dynamic
+textures are added. A common prose layout helper handles Unicode word boundaries,
+numeric width and wrapping. Writing Desk tab numerals now use the same rendering
+routine, retaining their existing size/position/color.
+
+Public terrain/distribution/lighting/weather metadata is sent in the Age catalog,
+with celestial data reused from its existing saved-cycle map. These are actual
+loaded Age settings rather than a reroll from the book ID or current config.
+Metadata excludes seeds, instability scores and providers. It does not load an
+unavailable destination merely to display a book. Full catalog replacement removes
+unloaded/retired entries; logout clears description/cycle caches. Older books with
+no authored symbol component use the random-description path. Existing Age/save
+formats remain readable. Catalog network protocol is now 11 (previously 10):
+client and server must use matching builds.
+
+Build passed; disposable no-optional dedicated-server checks passed catalog
+serialization, immutable snapshots, actual saved setting capture, cache
+replacement/clear, real restart, unload/reload and retirement. Pure layout checks
+covered Legacy word splitting, Unicode, wrapping, base-25 width and oversized
+numeric fallback. Test worlds and fixtures removed, server stopped and production
+JAR rebuilt. Visual glyph layering, book/lectern appearance and actual client
+catalog receipt remain player validation. No commit, push or publication.
+
+
+
+### Renamed Immersive Portals dimension bridge — 1.0.1.139-beta.1
+
+The player passed .138. Confirmed the user's correction: the 26.3 Immersive Portal
+implementation uses the Seamless Portals name/mod ID, retaining qouteall rendering,
+chunk-loading and dimension APIs. Added an optional shared dimension-ID adapter
+before Rivencraft catalog publication/acknowledgement. It synchronizes integer
+IDs and native type/sea-level metadata without delegating Age ownership. Failed
+synchronization blocks acknowledgement/travel rather than making a successfully
+committed Age appear to have failed binding. Startup, unload/reload, reseed and
+retirement are covered. Live book/crystal rendering remains later work.
+
+The installed working build passed 35 server creation/catalog checks plus 13 after
+restart. Normal book binding, native metadata, API ID roundtrips, two Ages,
+lifecycle changes and failed-creation nonpublication were checked. No-optional
+startup passed. Real client travel remains pending; Prism files were not changed.
+
+Correction to the initial artifact audit: old CurseForge file 8937394 fails during
+its own constructor on .99 with missing DataPackRegistryEvent$NewRegistry; this is
+NOT the latest release. The latest file is 9218525, displayed as 10.0.0 while its
+filename/internal metadata still say 1.0.0. Its SHA-256 exactly matches the user's
+installed working file:
+5d2bfc2a811a6526e3f6722c521d97e5de2869a6ead1c681323c3c472e4367a0.
+The compile dependency is corrected to 9218525 in .140. The earlier broad claim
+that the current published build cannot start was wrong and is superseded here.
+
+NeoForge audit on 2026-11-11: official Maven metadata lists .102 as latest in the
+26.3 line. Its universal JAR still lacks the old NewRegistry class, so upgrading
+cannot fix that OLD portal artifact. Current target remains validated .99; a
+separate .102 build/client/server check is recommended. No release authorized.
+
+
+### Immersive Portals Reborn comparison and shared bridge — 1.0.1.140-beta.1
+
+The user suggested Reborn. Verified the NeoForge 26.3 release is 7.0.12, file
+9435354 in CurseForge project 1721833. The newer 7.0.18 is Fabric. The Reborn JAR
+registers immersive_portals_reborn plus its legacy core aliases and retains the
+qouteall GUI rendering/portal/chunk/dimension APIs. It starts on NeoForge .99
+without Cloth Config or other optional mods in the test environment.
+
+Generalized the optional bridge to recognize either Reborn or Seamless. Both
+share DimensionIntId.onServerDimensionChanged and the createFromServer packet
+factory. Seamless's createPacket returns a vanilla Packet; Reborn's returns a
+CustomPacketPayload. The adapter now wraps createFromServer in the vanilla
+clientbound payload packet, preserving each fork's native two-/three-tag wire
+format. No cross-fork packet schema is invented and neither dependency is bundled.
+The compat probe recognizes both. A development run may select
+-PwithImmersivePortalsReborn or -PwithSeamlessPortals; requesting both is rejected
+because the forks share classes/mixins. The normal build remains optional-free.
+
+Reborn passed 32 creation/catalog checks and 15 after restart: real book-binding
+entry point, two runtime Ages, ID/type metadata, native wire roundtrip, per-player
+packet preparation, unload/reload, reseed, retirement isolation and persistence.
+Seamless latest file 9218525 passed the same 32 lifecycle/packet and 15 restart checks against the shared adapter.
+These are server/packet checks, not evidence of renderer quality or real client
+packet receipt. Reborn is a viable next client-test target; no performance
+superiority is claimed. Live snapshots, chunk leases/audio isolation, and live
+crystal surfaces still need porting. Player files were not modified. Temporary
+worlds/fixtures removed; no commit, push or publication.
+
+
+### Reborn live book previews — 1.0.1.141-beta.1
+
+Linking and Descriptive Book front panels now use Immersive Portals Reborn's
+live GUI-world renderer when Reborn is installed on both sides. This carries
+forward the 1.21.1 camera orbit (11-block radius, five blocks above the focus),
+destination sky/fog, chunk streaming and remote-audio isolation. Server destination
+resolution uses the actual held book or a nearby loaded stand's matching book;
+the client cannot request arbitrary destination coordinates.
+
+A unique session ID prevents stale replies or close packets from replacing or
+releasing another book's preview. One per-player eight-chunk-radius loader streams
+the view asynchronously, renews while the book stays open, and expires if its
+heartbeat is lost. Closing, logout, death/source invalidation, dimension changes,
+and shutdown release the lease. Destination resolution for Descriptive Books
+uses the same footing/platform rules as book travel.
+
+The rendering integration uses 26.3 GPU texture views with the deferred GUI.
+Reborn may resize its target before extraction records the texture view; clearing
+is deferred to its render hook, and the normal GUI draws the image beneath the
+Legacy panel cutout. The target uses the main framebuffer's depth/stencil format.
+The player camera is restored after remote rendering, and remote preview-world
+sounds are suppressed without muting the player's world.
+
+Set `[book_previews] reborn_live_views = false` in the local configuration to use
+animated panels. Missing Reborn or unavailable terrain also retains the animated
+fallback. Seamless's dimension-ID bridge remains available, but this live GUI
+implementation is activated only for Reborn. Live crystal portal surfaces and
+preview exploration controls remain separate port work.
+
+Validation: production build passed. An isolated real NeoForge 26.3.0.99
+dedicated-server/client run with Reborn 7.0.12 displayed the remote live Linking
+Book view; screenshot inspected for the panel cutout, upright image and actual
+terrain. The client completed without a renderer exception and logout left no
+preview chunk leases. The user also reported that the books displayed live views
+perfectly. All temporary worlds/client directories and fixture sources were
+removed, and the distributable was rebuilt without test classes.
+
+Startup warnings in this isolated run included Reborn's four deprecated
+`logoFile` metadata entries; these are upstream branding metadata warnings.
+The Linux narrator also lacks `libflite`, unrelated to the book renderer.
+
+
+### Reborn live crystal portals — 1.0.1.142-beta.1
+
+Crystal portals now create optional native Reborn render-only surfaces. Each
+coplanar opening is one masked mesh on each side, including irregular outlines;
+the destination image does not repeat once per portal block. Mesh planes sit
+inside the portal block thickness so the crystal frame remains in front. Once
+native surfaces are established, LIVE_VIEW hides only the animated portal model.
+The blocks and their receptacle owner pointers stay intact.
+
+Live views share destination resolution with portal book travel. Linking Books
+use their written facing, while Descriptive Books preserve the approaching
+entity's facing as their travel path does. The reference camera is anchored to
+standing eye height above the opening's floor, rather than to its vertical center.
+This prevents taller frames from shifting the preview's arrival height. Relative
+links resolve using the opening's center as the view reference; the actual
+entity's departure position is still used for travel.
+
+Native surfaces cannot teleport entities, accept remote interaction or perform
+cross-portal collision. Existing Rivencraft collision/queue and book rules remain
+authoritative, including catalog readiness, Disarm, momentum and arrival safety.
+Reborn handles visible-destination streaming through its normal portal system.
+
+Geometry/destination tags allow maintenance to reuse matching entities and replace
+stale ones. Activation establishes views immediately; normal receptacle maintenance
+restores them after restart. Book removal, frame shutdown, missing destinations
+and disabling the integration remove the native surfaces. Without Reborn the
+animated surface and ordinary travel continue to work. The server setting is
+[book_previews] reborn_crystal_live_views, default true.
+
+Validation on NeoForge 26.3.0.99 / Reborn 7.0.12: 68 server checks passed, covering
+all three plane axes, both sides, one mesh per opening, eye-position and facing
+transforms, entity reuse, fallback toggling and book removal. Five additional
+restart checks passed. An isolated real client/dedicated server rendered the live
+opening, then crossed into the correct Age through normal Rivencraft travel.
+Screenshots before/after were inspected; the user also reported success.
+
+An initial render test mistakenly bound its synthetic Linking Book at Y=1 inside
+the flat world's solid layers. The view correctly displayed underground terrain
+and the collision check refused travel. The corrected fixture bound to the actual
+surface (Y=4) and passed. No production spawn-height workaround was added for an
+invalid synthetic book. All temporary fixtures and test worlds were removed, and
+the distributable was rebuilt without test classes.
@@ -0,0 +1,81 @@
+# Rivencraft 26.3.0.1
+
+For **Minecraft 26.3**, **NeoForge 26.3.0.99** and **Java 25**.
+
+This regular release collects the player-validated .137–.142 development slices
+since 1.0.1.136-beta.1. Versions now use the Minecraft version followed by the
+release slice and its iteration: `26.3.0.1`. The JAR is
+`rivencraft-26.3.0.1.jar`. The existing Minecraft 1.21.1 release is unchanged.
+
+## Live destination views with Immersive Portals Reborn
+
+- Optional live rotating destination views in Linking and Descriptive Books,
+  including books on stands. Reborn streams the actual destination chunks.
+- Crystal portals show a continuous live view across each coplanar opening,
+  masked to its shape, with the crystal frame remaining in front.
+- Linking Book views use the written destination/facing; Descriptive Book
+  portals preserve the traveler's facing. Views anchor standing eye height to
+  the opening's floor, so taller frames do not shift arrival height.
+- Rivencraft retains control of portal travel, Disarm, momentum and arrival
+  safety. The native view cannot independently teleport or interact remotely.
+- Preview sessions release their chunk streams on close, logout, invalidation
+  or expiry. Remote book-preview audio is suppressed and the player camera
+  restored after rendering.
+- Portal maintenance restores views after restart and removes them when the
+  book is removed or the frame is shut down.
+- Tested with **[Immersive Portals Reborn 7.0.12 for NeoForge 26.3](https://www.curseforge.com/minecraft/mc-mods/immersive-portals-reborn-unofficial-fork/files/9435354)**.
+  Use one portal fork per instance. No optional mod is bundled or required.
+- The renamed Seamless fork also receives runtime Age dimension/metadata
+  synchronization; this release's live rendering is enabled for Reborn.
+
+## Random Ages, pages and book descriptions
+
+- New random-Age and library-page allowlists/blocklists accept short paths such
+  as `sky/static`, as well as full namespaced IDs.
+- Blocklists take precedence. An allowlist restricts only the categories it
+  mentions. Existing Ages and manually authored books remain usable.
+- Required empty categories use safe defaults; optional empty categories can be
+  omitted. Native preset biome pools and necessary biome minimum fallbacks can
+  bypass individual biome-page exclusions.
+- Random-Age Descriptive Books show Legacy glyph descriptions of their public
+  traits, beneath the readable Age name/author. Seed and instability scores
+  remain absent from these descriptions.
+- Optional portal-engine dimension IDs and native metadata synchronize before
+  the Rivencraft catalog acknowledgement permits travel.
+
+## Configuration
+
+In `config/rivencraft-local.toml`:
+
+- `random_pages.allowlist` and `random_pages.blocklist`: default empty.
+- `book_previews.reborn_live_views`: default `true`; disable locally for
+  animated book panels.
+- `book_previews.reborn_crystal_live_views`: default `true`; the server
+  controls live crystal surfaces. Disabling retains animated surfaces and travel.
+
+The built-in Legacy animation remains available without optional renderers.
+Dynamic Dimensions and Bad Packets are not required by the 26.3 line.
+
+## Validation and known limits
+
+The user passed the included slices in game. Disposable checks covered random
+policy resolution, description/catalog serialization and persistence, native
+dimension IDs and packet formats for both portal forks, preview rendering and
+chunk-lease cleanup, all three crystal portal plane axes, both sides, destination
+eye/facing transforms, fallback toggling and full restart restoration. A real
+dedicated server/client displayed the live crystal view and crossed into its Age.
+The no-optional-mod server also started successfully. Temporary fixtures/worlds
+were removed and the production JAR contains no test or optional-engine classes.
+
+**Known issue [#116](https://git.paddedcell.org/dnorberg/rivencraft/issues/116):**
+with Reborn active, a Static Sky Age can render its sky outside the book GUI.
+Use the animated book panel option if affected.
+
+26.3 is now published on the regular release channel at the user's request.
+This is not a claim that every 1.21.1 behavior or the final expanded-catalog
+two-client regression is complete. The remaining multiplayer, parity and shared
+follow-up issues stay open. Preview exploration controls and Create/Ponder scenes
+are not included in this release.
+
+Use matching client/server JARs. Back up worlds, keep the Minecraft tracks and
+saves separate, and do not downgrade worlds containing newer data.
@@ -0,0 +1,35 @@
+# Random Page policy test — 1.0.1.137-beta.1
+
+Install the new JAR and launch once so the new entries appear in
+Minecraft's config/rivencraft-local.toml. Close the instance before editing.
+On a dedicated server edit its own config, not the client's.
+
+For a visible check, replace only the existing random_pages section with:
+
+```toml
+[random_pages]
+allowlist = ["terrain/flat", "biome/single", "biome/plains", "sky/static", "lighting/normal", "weather/off", "feature/not_present"]
+blocklist = ["sky/nether", "celestial/sun", "celestial/moon"]
+```
+
+The deliberately nonexistent feature entry restricts only optional features,
+leaving an empty feature pool for this test.
+
+1. Bind a Descriptive Book with only a Link Panel. Enter it: expect Flat terrain,
+   Plains, Static Sky, normal lighting, no rain and no suns/moons. Optional Page
+   features/structures should be absent; native biome decoration is independent.
+2. Bind an authored Flat/Plains/Single/Nether Sky book. Nether Sky remains usable
+   despite the blocklist; the setting controls random generation and direct
+   library loot, not manual authorship. The Page remains visible in Creative/JEI.
+3. Change sky/static to sky/end, restart and revisit the first Age. It must retain
+   Static Sky. A newly bound Link-Panel-only book should get End Sky.
+4. Optional library check: allowlist = ["sky/static"], blocklist = ["sky/nether"].
+   New library direct Pages may include Static Sky or other unrestricted
+   categories, but never another Sky Page. Test both library loot modes where
+   desired. Existing chests/stands remain untouched; AGE_ONLY may have no Pages
+   when the book's written Page set has no eligible entries.
+
+Restore both lists to [] afterward unless you want the restrictions to persist.
+No existing Age should change. Keep the full world backup customary for beta
+updates. Native biome presets and required minimum-biome fallbacks intentionally
+bypass biome-Page filters; Sealed Notebooks keep their separate 1.21.1 draw pool.
@@ -0,0 +1,21 @@
+# Random-Age glyph description test — 1.0.1.138-beta.1
+
+Use the new build on both client and server (Age catalog protocol 11).
+
+1. Open an existing or new Link-Panel-only Descriptive Book. Its front spread
+   should retain the plain-text Age name and author on the left, with the generated
+   description below rendered as Legacy glyphs. The destination animation remains
+   on the right and clicking it still travels.
+2. Put the same book on a lectern and open it. The description and panel should
+   match handheld use.
+3. Open an authored book containing Symbol Pages. Its front spread should retain
+   just the name/author, and page turning should show one authored symbol at a time.
+4. Reconnect or restart, then reopen the random book. Glyph traits should remain
+   consistent with its saved Age. Test a longer name and GUI scale for clipping.
+5. Check Writing Desk tab numbers around 24/25 and 49/50. Their existing glyph
+   size/position and base-25 behavior should be unchanged.
+
+Descriptions are available only for loaded Ages; viewing a book does not force-load
+an unloaded/retired Age. No instability score or seed appears in the description.
+The desktop glyph display still needs your visual check; server/codec/layout
+validation does not substitute for a real client render check.
@@ -0,0 +1,8 @@
+# Superseded by the 1.0.1.140-beta.1 portal-fork test
+
+Use TESTING_1.0.1.140-beta.1.md. It covers both supported fork candidates.
+
+Correction: the user's installed Seamless file exactly matches current published
+CurseForge file 9218525 (displayed 10.0.0, internal version/filename 1.0.0).
+The startup failure applies only to older file 8937394. The earlier recommendation
+to avoid the current download was incorrect.
@@ -0,0 +1,29 @@
+# Portal fork runtime compatibility — 1.0.1.140-beta.1
+
+Candidate downloads for Minecraft 26.3 / NeoForge:
+- Immersive Portals Reborn 7.0.12:
+  https://www.curseforge.com/minecraft/mc-mods/immersive-portals-reborn-unofficial-fork/files/9435354
+  Version 7.0.18 is Fabric, so use the NeoForge 7.0.12 file for this test.
+- Seamless latest file 9218525:
+  https://www.curseforge.com/minecraft/mc-mods/immersive-portal/files/9218525
+  Display name is 10.0.0, but its downloaded filename/internal version remain 1.0.0.
+  This exactly matches the user's installed working JAR.
+
+Use ONE portal fork per instance: they share engine classes and mixins.
+Prism files were left unchanged. Install matching Rivencraft builds on both sides
+for dedicated testing. Current tested loader is NeoForge 26.3.0.99.
+
+1. Enable/install the chosen fork and Rivencraft .140.
+2. Create an authored Descriptive Book after joining, using a distinctive sky and
+   lighting. Travel into its newly created Age without reconnecting.
+3. Return using a bound Linking Book and test a second freshly created Age.
+4. Restart and revisit both Ages. Check for unknown/unloaded-dimension rejection,
+   disconnects or incorrect sky/lighting.
+5. Test existing crystal portals through the usual Rivencraft fallback path.
+
+This slice synchronizes runtime Ages and native metadata. Live book panels and
+live crystal portal surfaces are NOT ported yet; animated fallbacks are expected.
+Actual client travel/packet handling needs your check. Server lifecycle, packet
+serialization and restart checks passed with both Reborn and latest Seamless
+(32 lifecycle/packet plus 15 restart checks each). NeoForge .102 is a candidate for a later isolated upgrade
+check; the project target has not been changed yet.
@@ -0,0 +1,26 @@
+# 1.0.1.141-beta.1 — Reborn live book previews
+
+Use NeoForge 26.3.0.99 and Immersive Portals Reborn 7.0.12, CurseForge file 9435354.
+Install one portal fork per instance and matching Rivencraft builds on a dedicated
+server/client. Reborn remains optional; nothing is bundled.
+
+The user reports live views working in both book types. Follow-up coverage:
+1. View a Linking Book and Descriptive Book pointing to different Ages. Check
+   orbiting terrain, upright orientation, destination lighting/sky and the panel
+   cutout. Click the live panel to travel using the existing book controls.
+2. Repeat from a book stand, including a destination whose chunks are not loaded.
+3. Close/reopen, switch books quickly and restart/revisit the Age. A stale view
+   must not replace the newly selected destination.
+4. During rain, confirm the source world's weather audio remains audible and the
+   remote world's sounds do not leak into the GUI.
+5. Set [book_previews] reborn_live_views = false in rivencraft-local.toml to
+   verify the animated fallback; restore true for live views.
+
+The live image streams actual destination chunks. It is not restricted to the
+old fixed block snapshot volume. Exploration controls and live crystal portal
+surfaces are not included in this slice.
+
+Build and isolated dedicated/client rendering check passed, with a live Linking
+Book screenshot inspected and zero remaining preview leases on logout. Temporary
+test worlds were removed regardless of result. Reborn's four deprecated logoFile
+startup warnings concern its metadata, not Rivencraft rendering.
@@ -0,0 +1,30 @@
+# 1.0.1.142-beta.1 — Reborn live crystal portal surfaces
+
+Use Reborn 7.0.12 for NeoForge 26.3, CurseForge file 9435354, with NeoForge
+26.3.0.99. Use one portal fork and matching Rivencraft builds on a server/client.
+
+Implemented and validated:
+- One continuous view per opening on each side, masked to the portal cells.
+- Correct destination eye-height reference; Linking Book facing and Descriptive
+  Book inherited facing.
+- Native surfaces render only; Rivencraft's blocks retain transport and effects.
+- Fallback model hidden only for established live surfaces.
+- Maintenance restores views after restart and removes them on shutdown/removal.
+- Optional server setting [book_previews] reborn_crystal_live_views = false retains
+  animated surfaces and ordinary portal travel.
+
+68 server checks and five restart checks passed, plus a real dedicated/client
+live-view and walking-through check. Screenshots were inspected and the user
+reported success. Temporary worlds were deleted and fixture sources removed.
+
+Useful follow-up manual coverage:
+1. Try both book types, compare portal arrival to using the same book, and inspect
+   both sides of the frame.
+2. Try taller, horizontal and irregular frames; check that frame edges occlude the
+   scene and the view does not repeat per cell.
+3. Restart, revisit, remove/reinsert the book and break a frame block.
+4. Check a destination with different sky/lighting and an initially unloaded
+   destination area.
+
+The initial synthetic render fixture used a blocked Y=1 target; that was corrected
+to the resolved Y=4 surface. No global landing-height behavior was changed.
@@ -17,7 +17,24 @@ repositories {
        content { includeGroup 'mezz.jei'; includeGroup 'net.mezzdev.config' }
    }
 }
+// Optional APIs stay out of published dependency metadata.
+configurations {
+    localRuntime
+    runtimeClasspath.extendsFrom localRuntime
+}
+
 dependencies {
+    // Both optional forks retain qouteall APIs, but must never be loaded together.
+    if (project.hasProperty('withSeamlessPortals') && project.hasProperty('withImmersivePortalsReborn'))
+        throw new GradleException('Choose one Immersive Portals fork for the development run')
+    def portalDependency = project.hasProperty('withImmersivePortalsReborn')
+            ? 'curse.maven:immersive-portals-reborn-unofficial-fork-1721833:9435354'
+            : project.hasProperty('seamlessPortalsJar') ? files(project.property('seamlessPortalsJar'))
+            : project.hasProperty('withSeamlessPortals') ? 'curse.maven:immersive-portal-1511174:9218525'
+            : 'curse.maven:immersive-portals-reborn-unofficial-fork-1721833:9435354'
+    compileOnly portalDependency
+    if (project.hasProperty('withSeamlessPortals') || project.hasProperty('withImmersivePortalsReborn'))
+        localRuntime portalDependency
    // Compile against the 26.3 baseline API; a local current Ruins JAR can override it.
    def ruinsDependency = project.hasProperty('ruinsJar') ? files(project.property('ruinsJar'))
            : 'curse.maven:ruins-227873:8962119'
@@ -40,7 +57,7 @@ group = 'net.dnorberg.rivencraft'
 version = mod_version

 base {
-    archivesName = "rivencraft-${minecraft_version}"
+    archivesName = "rivencraft"
 }

 java.toolchain.languageVersion = JavaLanguageVersion.of(25)
@@ -7,7 +7,7 @@ neo_version=26.3.0.99
 mod_id=rivencraft
 mod_name=Rivencraft
 mod_license=LGPL-3.0-or-later
-mod_version=1.0.1.136-beta.1
+mod_version=26.3.0.1

 jei_version=31.17.0.109

@@ -7,6 +7,10 @@ public final class PortConfig {
    public enum LibraryLootMode { LEGACY, AGE_ONLY }
    public static final ModConfigSpec.EnumValue<LibraryLootMode> LIBRARY_LOOT_MODE;
    public enum ReturnLinkMode { ON_CREATION, ALWAYS, DISABLED }
+    public static final ModConfigSpec.ConfigValue<java.util.List<? extends String>> RANDOM_PAGE_ALLOWLIST;
+    public static final ModConfigSpec.ConfigValue<java.util.List<? extends String>> RANDOM_PAGE_BLOCKLIST;
+    public static final ModConfigSpec.BooleanValue LIVE_BOOK_PREVIEWS;
+    public static final ModConfigSpec.BooleanValue CRYSTAL_LIVE_VIEWS;
    public static final ModConfigSpec SPEC;
    public static final ModConfigSpec.BooleanValue AUTO_WHITELIST_SERENE_AGES;
    public static final ModConfigSpec.IntValue SYMBOL_INK_COST;
@@ -17,6 +21,26 @@ public final class PortConfig {

    static {
        var builder = new ModConfigSpec.Builder();
+        builder.push("book_previews");
+        LIVE_BOOK_PREVIEWS = builder.comment("Show live rotating destination views when Immersive Portals Reborn is installed on client and server.",
+                "Disable locally to retain the animated Legacy link panels.")
+                .define("reborn_live_views", true);
+        CRYSTAL_LIVE_VIEWS = builder.comment("Server option: create native live crystal portal surfaces when Reborn is installed.",
+                "Disabling keeps crystal portal travel with the animated surface.")
+                .define("reborn_crystal_live_views", true);
+        builder.pop();
+        builder.push("random_pages");
+        RANDOM_PAGE_ALLOWLIST = builder.comment(
+                "Page paths allowed in new random Ages and newly generated library pages.",
+                "Restricts only categories it mentions; other categories remain unrestricted.",
+                "Example: [\"sky/static\"]; full namespaced IDs are accepted too.")
+                .defineList("allowlist", java.util.List.<String>of(), () -> "sky/static", PortConfig::validPageId);
+        RANDOM_PAGE_BLOCKLIST = builder.comment(
+                "Page paths excluded from new random Ages and newly generated library pages.",
+                "Blocklist wins. Existing Ages, Creative/JEI pages and manually authored books remain usable.",
+                "Required empty categories use safe defaults; Native biomes come from the preset, not biome pages.")
+                .defineList("blocklist", java.util.List.<String>of(), () -> "sky/static", PortConfig::validPageId);
+        builder.pop();
        builder.push("serene_seasons");
        AUTO_WHITELIST_SERENE_AGES = builder.comment("Automatically whitelist Ages with seed-selected/legacy cycling seasons. Explicit pages still apply; existing entries are preserved when disabled.")
                .define("auto_whitelist_ages", true);
@@ -47,5 +71,10 @@ public final class PortConfig {
        SPEC = builder.build();
    }

+    private static boolean validPageId(Object value) {
+        if (!(value instanceof String id)) return false;
+        try { net.dnorberg.rivencraft.age.PortRandomPagePolicy.parsePageId(id); return true; }
+        catch (IllegalArgumentException exception) { return false; }
+    }
    private PortConfig() {}
 }
@@ -249,10 +249,13 @@ public final class Rivencraft {
        COMPONENTS.register(modEventBus);
        RECIPE_SERIALIZERS.register(modEventBus);
        net.dnorberg.rivencraft.compat.RuinsCompatibility.register();
+        net.dnorberg.rivencraft.compat.RebornBookPreviews.register();
        ModCreativeTabs.register(modEventBus);
        PortBiomeSources.register(modEventBus);
        PortChunkGenerators.register(modEventBus);
        NeoForge.EVENT_BUS.addListener(RuntimeAgeBackend::onLevelLoad);
+        NeoForge.EVENT_BUS.addListener(net.neoforged.bus.api.EventPriority.LOWEST,
+                net.dnorberg.rivencraft.compat.ImmersivePortalsCompatibility::onServerStarted);
        NeoForge.EVENT_BUS.addListener(net.dnorberg.rivencraft.age.PortAgeWeather::onLevelTickPre);
        NeoForge.EVENT_BUS.addListener(net.dnorberg.rivencraft.age.PortAcceleratedTicks::onLevelTickPost);
        NeoForge.EVENT_BUS.addListener(PortAgeCommands::register);
@@ -13,7 +13,8 @@ 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,
                                Map<Identifier, PortAgeColors> colors,
-                                Map<Identifier, PortDayCycle> dayCycles) implements CustomPacketPayload {
+                                Map<Identifier, PortDayCycle> dayCycles,
+                                Map<Identifier, PortAgeDescription> descriptions) 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(
@@ -21,6 +22,7 @@ public record AgeCatalogPayload(int version, List<Identifier> dimensions,
            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,
+            ByteBufCodecs.map(HashMap::new, Identifier.STREAM_CODEC, PortAgeDescription.STREAM_CODEC), AgeCatalogPayload::descriptions,
            AgeCatalogPayload::new
    );

@@ -28,6 +30,7 @@ public record AgeCatalogPayload(int version, List<Identifier> dimensions,
        dimensions = List.copyOf(dimensions);
        colors = Map.copyOf(colors);
        dayCycles = Map.copyOf(dayCycles);
+        descriptions = Map.copyOf(descriptions);
    }

    @Override
@@ -21,7 +21,7 @@ public final class AgeCatalogSync {
    }

    public static void registerPayloads(RegisterPayloadHandlersEvent event) {
-        var registrar = event.registrar("10");
+        var registrar = event.registrar("11");
        registrar.playToClient(AgeCatalogPayload.TYPE, AgeCatalogPayload.STREAM_CODEC);
        registrar.playToServer(AgeCatalogAckPayload.TYPE, AgeCatalogAckPayload.STREAM_CODEC,
                (payload, context) -> {
@@ -55,6 +55,9 @@ public final class AgeCatalogSync {
        State state = state(server);
        state.version++;
        state.acknowledged.clear();
+        // Optional synchronization failures must not turn a committed Age into a
+        // reported binding failure. Withhold acknowledgements, so travel stays safe.
+        if (!net.dnorberg.rivencraft.compat.ImmersivePortalsCompatibility.synchronize(server)) return;
        for (ServerPlayer player : server.getPlayerList().getPlayers()) {
            try {
                send(player);
@@ -76,9 +79,11 @@ public final class AgeCatalogSync {
        MinecraftServer server = player.level().getServer();
        State state = state(server);
        state.acknowledged.remove(player.getUUID());
+        if (!net.dnorberg.rivencraft.compat.ImmersivePortalsCompatibility.beforeCatalog(player))
+            throw new IllegalStateException("Optional portal dimension catalog is unavailable");
        var dimensions = server.levelKeys().stream().map(key -> key.identifier()).sorted().toList();
        PacketDistributor.sendToPlayer(player, new AgeCatalogPayload(state.version, dimensions,
-                RuntimeAgeBackend.savedColors(server), RuntimeAgeBackend.savedDayCycles(server)));
+                RuntimeAgeBackend.savedColors(server), RuntimeAgeBackend.savedDayCycles(server), RuntimeAgeBackend.loadedDescriptions(server)));
    }

    private static void acknowledge(ServerPlayer player, int version) {
@@ -46,7 +46,7 @@ public final class PortAgeCommands {
                            StringBuilder mods = new StringBuilder("Optional mods: ");
                            for (String id : new String[]{"jei", "terrablender", "biomesoplenty",
                                    "sereneseasons", "glitchcore", "ruins", "create",
-                                    "ponder", "immersive_portals_core"}) {
+                                    "ponder", "immersive_portals_core", "seamlessportals", "immersive_portals_reborn"}) {
                                if (mods.length() > "Optional mods: ".length()) mods.append(", ");
                                mods.append(id).append('=').append(ModList.get().isLoaded(id));
                            }
@@ -1777,7 +1777,7 @@ public final class PortAgeCommands {

    private static void verifyCatalogRoundTrip(net.minecraft.server.MinecraftServer server) {
        var payload = new AgeCatalogPayload(1, server.levelKeys().stream().map(key -> key.identifier()).toList(),
-                RuntimeAgeBackend.savedColors(server), RuntimeAgeBackend.savedDayCycles(server));
+                RuntimeAgeBackend.savedColors(server), RuntimeAgeBackend.savedDayCycles(server), RuntimeAgeBackend.loadedDescriptions(server));
        var buffer = new net.minecraft.network.RegistryFriendlyByteBuf(io.netty.buffer.Unpooled.buffer(),
                server.registryAccess(), net.neoforged.neoforge.network.connection.ConnectionType.NEOFORGE);
        try {
@@ -0,0 +1,24 @@
+package net.dnorberg.rivencraft.age;
+
+import java.util.Map;
+import net.minecraft.network.RegistryFriendlyByteBuf;
+import net.minecraft.network.codec.ByteBufCodecs;
+import net.minecraft.network.codec.StreamCodec;
+import net.minecraft.resources.Identifier;
+
+/** Public presentation only: no seed, instability score or provider information. */
+public record PortAgeDescription(PortAgeTerrain terrain, PortBiomePlan.Distribution distribution,
+                                 PortLighting lighting, PortWeatherMode weather) {
+    public static final StreamCodec<RegistryFriendlyByteBuf, PortAgeDescription> STREAM_CODEC = StreamCodec.composite(
+            ByteBufCodecs.STRING_UTF8.map(PortAgeTerrain::valueOf, PortAgeTerrain::name), PortAgeDescription::terrain,
+            ByteBufCodecs.STRING_UTF8.map(PortBiomePlan.Distribution::valueOf, PortBiomePlan.Distribution::name), PortAgeDescription::distribution,
+            ByteBufCodecs.STRING_UTF8.map(PortLighting::valueOf, PortLighting::name), PortAgeDescription::lighting,
+            ByteBufCodecs.STRING_UTF8.map(PortWeatherMode::valueOf, PortWeatherMode::name), PortAgeDescription::weather,
+            PortAgeDescription::new);
+    private static volatile Map<Identifier, PortAgeDescription> clientDescriptions = Map.of();
+
+    public static void updateClient(Map<Identifier, PortAgeDescription> descriptions) {
+        clientDescriptions = Map.copyOf(descriptions);
+    }
+    public static PortAgeDescription forClient(Identifier id) { return clientDescriptions.get(id); }
+}
@@ -36,10 +36,14 @@ public final class PortAgeTravel {
    public static BlockPos resolveLanding(ServerLevel target) { return resolveLanding(target, true); }
    public static BlockPos resolveLanding(ServerLevel target, net.minecraft.world.entity.Entity entity,
                                          net.dnorberg.rivencraft.item.LinkProperties properties) {
+        return resolveLanding(target, (ServerLevel) entity.level(), entity.blockPosition(), properties);
+    }
+    public static BlockPos resolveLanding(ServerLevel target, ServerLevel source, BlockPos departure,
+                                          net.dnorberg.rivencraft.item.LinkProperties properties) {
        BlockPos landing = resolveLanding(target, !properties.has(net.dnorberg.rivencraft.item.LinkProperties.DISABLE_PLATFORM));
        if (landing == null || !properties.has(net.dnorberg.rivencraft.item.LinkProperties.RELATIVE_LINK)) return landing;
        return findFootedDestination(target, net.dnorberg.rivencraft.item.PortLinkDestinations.relativeOrigin(
-                (ServerLevel) entity.level(), target, entity.blockPosition())).orElse(null);
+                source, target, departure)).orElse(null);
    }
    public static BlockPos resolveLanding(ServerLevel target, boolean generatePlatform) {
        boolean fissure = target.getChunkSource().getGenerator() instanceof PortFeatureChunkGenerator features
@@ -144,6 +144,10 @@ public record PortDayCycle(boolean authored, double period, int stoppedTime,

    /** Creation-only completion. Exact diagnostic fixtures can still use compile. */
    public static PortDayCycle resolve(List<Identifier> pages, long seed, long nativeTicks) {
+        return resolve(pages, seed, nativeTicks, PortRandomPagePolicy.UNRESTRICTED);
+    }
+
+    public static PortDayCycle resolve(List<Identifier> pages, long seed, long nativeTicks, PortRandomPagePolicy policy) {
        if (!validWriting(pages))
            throw new IllegalArgumentException("An Age may have at most ten suns and ten moons");
        if (pages.stream().anyMatch(PortDayCycle::isController)) return compile(pages, seed, nativeTicks);
@@ -152,7 +156,8 @@ public record PortDayCycle(boolean authored, double period, int stoppedTime,
        var random = new Random(seed ^ 0x534B5950524F464CL);
        random.nextInt(5);
        randomColor(random);
-        int suns = random.nextInt(4), moons = random.nextInt(4);
+        int suns = policy.allows(Identifier.parse("rivencraft:celestial/sun")) ? random.nextInt(4) : 0;
+        int moons = policy.allows(Identifier.parse("rivencraft:celestial/moon")) ? random.nextInt(4) : 0;
        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);
@@ -309,6 +314,8 @@ public record PortDayCycle(boolean authored, double period, int stoppedTime,
                net.minecraft.core.registries.Registries.WORLD_CLOCK).getOrThrow(WorldClocks.OVERWORLD)).totalTicks();
    }

+    public static PortDayCycle forClient(Identifier id) { return clientCycles.getOrDefault(id, NATIVE); }
+
    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();
@@ -1,6 +1,5 @@
 package net.dnorberg.rivencraft.age;

-import java.util.Arrays;
 import java.util.List;
 import java.util.Random;
 import net.minecraft.resources.Identifier;
@@ -8,21 +7,28 @@ 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));
+        return resolve(pages, seed, terrain, PortRandomPagePolicy.UNRESTRICTED);
    }

-    private static <T> T rankedDefault(Random random, T[] choices) {
+    public static PortEnvironmentSelection resolve(List<Identifier> pages, long seed, PortAgeTerrain terrain,
+                                                    PortRandomPagePolicy policy) {
+        PortLighting lighting = pages.stream().map(PortLighting::forPage).filter(java.util.Objects::nonNull)
+                .findFirst().orElseGet(() -> rankedDefault(new Random(seed ^ 0x4C49474854494E47L), PortLighting.values(), "lighting", policy));
+        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(), "weather", policy));
+        return new PortEnvironmentSelection(weather, lighting, PortSkyStyle.resolve(pages, seed, policy));
+    }
+
+    private static <T extends Enum<T>> T rankedDefault(Random random, T[] choices, String category, PortRandomPagePolicy policy) {
        // 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);
+        var options = new java.util.ArrayList<PortRankedChoice.Option<T>>();
+        for (int i = 0; i < choices.length; i++)
+            options.add(new PortRankedChoice.Option<>(choices[i], i == 0 ? 1 : 2));
+        return PortRankedChoice.choose(random, policy.required(options,
+                option -> PortRandomPagePolicy.page(category, option.value()),
+                new PortRankedChoice.Option<>(choices[0], 1)));
    }
 }
@@ -333,9 +333,14 @@ public final class PortLibraryFeature {
    }

    static List<Identifier> symbolsForLoot(List<Identifier> ageSymbols, PortConfig.LibraryLootMode mode) {
+        return symbolsForLoot(ageSymbols, mode, PortRandomPagePolicy.configured());
+    }
+
+    static List<Identifier> symbolsForLoot(List<Identifier> ageSymbols, PortConfig.LibraryLootMode mode,
+                                          PortRandomPagePolicy policy) {
        return mode == PortConfig.LibraryLootMode.AGE_ONLY
-                ? ageSymbols.stream().filter(id -> PortSymbolPages.find(id) != null).distinct().toList()
-                : PortSymbolPages.sealedCandidateIds();
+                ? ageSymbols.stream().filter(policy::allows).filter(id -> PortSymbolPages.find(id) != null).distinct().toList()
+                : PortSymbolPages.libraryCandidateIds().stream().filter(policy::allows).toList();
    }

    private static ItemStack page(List<Identifier> symbols, RandomSource random) {
@@ -17,17 +17,32 @@ public final class PortRandomAgeSelection {
    public record Selection(PortAgeTerrain terrain, PortBiomePlan biomes) {}

    public static Selection select(MinecraftServer server, long seed) {
+        return select(server, seed, PortRandomPagePolicy.UNRESTRICTED);
+    }
+
+    public static Selection select(MinecraftServer server, long seed, PortRandomPagePolicy policy) {
        // Match the 1.21.1 Legacy-rank choices: Standard and Flat are common;
        // the other terrain families are rarer. The sorted order is deliberate.
-        PortAgeTerrain terrain = terrain(seed);
+        PortAgeTerrain terrain = terrain(seed, policy);
        if (terrain == PortAgeTerrain.VOID)
            return new Selection(terrain, new PortBiomePlan(PortBiomePlan.Distribution.SINGLE,
                    List.of(Identifier.withDefaultNamespace("the_void"))));

-        PortBiomePlan.Distribution distribution = distribution(seed);
+        PortBiomePlan.Distribution distribution = distribution(seed, policy);
        List<Identifier> eligible = eligibleBiomes(server, terrain);
-        if (eligible.size() < 2 && distribution != PortBiomePlan.Distribution.NATIVE)
-            distribution = PortBiomePlan.Distribution.SINGLE;
+        if (distribution != PortBiomePlan.Distribution.NATIVE) {
+            var filtered = new ArrayList<>(policy.eligible(eligible, PortRegistryPages::biomePageId));
+            // Native presets are not Page-selected. Other controllers retain their minimum,
+            // with the same preferred-biome/registry fallback as 1.21.1.
+            int minimum = distribution == PortBiomePlan.Distribution.SINGLE ? 1 : 2;
+            Identifier preferred = Identifier.withDefaultNamespace(terrain == PortAgeTerrain.CAVE ? "deep_dark" : "plains");
+            if (filtered.size() < minimum && eligible.contains(preferred) && !filtered.contains(preferred))
+                filtered.add(preferred);
+            for (var candidate : eligible)
+                if (filtered.size() < minimum && !filtered.contains(candidate)) filtered.add(candidate);
+            eligible = List.copyOf(filtered);
+            if (eligible.size() < 2) distribution = PortBiomePlan.Distribution.SINGLE;
+        }
        if (distribution == PortBiomePlan.Distribution.NATIVE)
            return new Selection(terrain, new PortBiomePlan(distribution,
                    terrain == PortAgeTerrain.CAVE ? eligible : List.of()));
@@ -48,18 +63,28 @@ public final class PortRandomAgeSelection {
    }

    public static PortAgeTerrain terrain(long seed) {
-        return weighted(new Random(seed ^ 0x5445525241494E4CL), terrains(), new int[]{1, 1, 5, 1, 6, 1});
+        return terrain(seed, PortRandomPagePolicy.UNRESTRICTED);
+    }
+
+    public static PortAgeTerrain terrain(long seed, PortRandomPagePolicy policy) {
+        return ranked(new Random(seed ^ 0x5445525241494E4CL), terrains(), new int[]{3, 3, 2, 3, 1, 3},
+                policy, value -> PortRandomPagePolicy.page("terrain", value), PortAgeTerrain.STANDARD);
    }

    /** First AgeTraits draw in 1.21.1; shared by random and partly authored Ages. */
    public static PortBiomePlan.Distribution distribution(long seed) {
-        return weighted(new Random(seed ^ 0x524956454E435241L),
+        return distribution(seed, PortRandomPagePolicy.UNRESTRICTED);
+    }
+
+    public static PortBiomePlan.Distribution distribution(long seed, PortRandomPagePolicy policy) {
+        return ranked(new Random(seed ^ 0x524956454E435241L),
                List.of(PortBiomePlan.Distribution.NATIVE, PortBiomePlan.Distribution.SINGLE,
                        PortBiomePlan.Distribution.MEDIUM, PortBiomePlan.Distribution.TILED,
                        PortBiomePlan.Distribution.GRID, PortBiomePlan.Distribution.TINY,
                        PortBiomePlan.Distribution.SMALL, PortBiomePlan.Distribution.LARGE,
                        PortBiomePlan.Distribution.HUGE),
-                new int[]{3, 3, 3, 1, 1, 1, 1, 1, 1});
+                new int[]{1, 1, 1, 2, 2, 2, 2, 2, 2}, policy,
+                value -> PortRandomPagePolicy.page("biome", value), PortBiomePlan.Distribution.NATIVE);
    }

    public static List<Identifier> eligibleBiomes(MinecraftServer server, PortAgeTerrain terrain) {
@@ -84,14 +109,13 @@ public final class PortRandomAgeSelection {
        return caves.isEmpty() ? List.of(Identifier.withDefaultNamespace("lush_caves")) : caves;
    }

-    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);
-        for (int index = 0; index < choices.size(); index++) {
-            ticket -= weights[index];
-            if (ticket < 0) return choices.get(index);
-        }
-        throw new IllegalStateException("Random Age ticket was not consumed");
+    private static <T> T ranked(Random random, List<T> choices, int[] ranks, PortRandomPagePolicy policy,
+                                java.util.function.Function<T, Identifier> page, T fallback) {
+        var options = new ArrayList<PortRankedChoice.Option<T>>();
+        for (int i = 0; i < choices.size(); i++)
+            options.add(new PortRankedChoice.Option<>(choices.get(i), ranks[i]));
+        var eligible = policy.eligible(options, option -> page.apply(option.value()));
+        return eligible.isEmpty() ? fallback : PortRankedChoice.choose(random, eligible);
    }
+
 }
@@ -14,8 +14,13 @@ public final class PortRandomFeatureSelection {

    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);
+        return select(server, seed, terrain, biomes, PortRandomPagePolicy.UNRESTRICTED);
+    }
+
+    public static Selection select(net.minecraft.server.MinecraftServer server, long seed,
+                                    PortAgeTerrain terrain, PortBiomePlan biomes, PortRandomPagePolicy policy) {
+        var base = select(seed, terrain, policy);
+        var structures = PortRandomStructureSelection.select(server, seed, terrain, biomes, policy);
        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(),
@@ -24,6 +29,10 @@ public final class PortRandomFeatureSelection {
    }

    public static Selection select(long seed, PortAgeTerrain terrain) {
+        return select(seed, terrain, PortRandomPagePolicy.UNRESTRICTED);
+    }
+
+    public static Selection select(long seed, PortAgeTerrain terrain, PortRandomPagePolicy policy) {
        var random = new Random(seed ^ 0x4D4154455249414CL);
        int count = random.nextInt(3);
        var terrainPage = id("terrain/" + terrain.name().toLowerCase(java.util.Locale.ROOT));
@@ -31,12 +40,13 @@ public final class PortRandomFeatureSelection {
        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)))
+            if (policy.allows(page) && 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();
+        List<Identifier> solids = policy.eligible(PortRegistryPages.solidMaterialIds(), PortRegistryPages::blockPageId);
+        List<Identifier> fluids = policy.eligible(PortRegistryPages.fluidMaterialIds(), PortRegistryPages::blockPageId);
        for (int selected = 0; selected < count && !candidates.isEmpty();) {
            Identifier feature = PortRankedChoice.choose(random, candidates);
            candidates.removeIf(option -> option.value().equals(feature));
@@ -46,12 +56,12 @@ public final class PortRandomFeatureSelection {
            pages.add(feature);
            selected++;
        }
-        if (terrain != PortAgeTerrain.FLAT && terrain != PortAgeTerrain.VOID
+        if (policy.allows(PortTerrainFeaturePlan.SKYLANDS) && 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)
+        if (policy.allows(PortTerrainFeaturePlan.CRYSTAL_FORMATIONS) && terrain != PortAgeTerrain.CAVE && terrain != PortAgeTerrain.VOID && random.nextInt(10) == 0)
            pages.add(PortTerrainFeaturePlan.CRYSTAL_FORMATIONS);
-        if (randomStarFissure(seed)) pages.add(PortTerrainFeaturePlan.STAR_FISSURES);
+        if (policy.allows(PortTerrainFeaturePlan.STAR_FISSURES) && randomStarFissure(seed)) pages.add(PortTerrainFeaturePlan.STAR_FISSURES);
        return new Selection(PortAuthoredWriting.rockPlan(pages, seed), PortAuthoredWriting.lakePlan(pages, seed),
                PortAuthoredWriting.terrainFeaturePlan(pages, seed), 0);
    }
@@ -0,0 +1,66 @@
+package net.dnorberg.rivencraft.age;
+
+import java.util.List;
+import java.util.Set;
+import java.util.stream.Collectors;
+import net.dnorberg.rivencraft.PortConfig;
+import net.minecraft.resources.Identifier;
+
+/** Creation-time eligibility; the resolved Age settings are saved, never reselected on reload. */
+public record PortRandomPagePolicy(Set<Identifier> allowlist, Set<Identifier> blocklist) {
+    public static final PortRandomPagePolicy UNRESTRICTED = new PortRandomPagePolicy(Set.of(), Set.of());
+
+    public PortRandomPagePolicy {
+        allowlist = Set.copyOf(allowlist);
+        blocklist = Set.copyOf(blocklist);
+    }
+
+    public static PortRandomPagePolicy configured() {
+        return new PortRandomPagePolicy(parse(PortConfig.RANDOM_PAGE_ALLOWLIST.get()),
+                parse(PortConfig.RANDOM_PAGE_BLOCKLIST.get()));
+    }
+
+    private static Set<Identifier> parse(List<? extends String> ids) {
+        return ids.stream().map(PortRandomPagePolicy::parsePageId).collect(Collectors.toUnmodifiableSet());
+    }
+
+    /** Server config IDs may omit the built-in Rivencraft namespace. */
+    public static Identifier parsePageId(String value) {
+        Identifier id = Identifier.tryParse(value.contains(":") ? value : "rivencraft:" + value);
+        if (id == null) throw new IllegalArgumentException("Invalid Page ID " + value);
+        return id;
+    }
+
+    public boolean allows(Identifier id) {
+        if (blocklist.contains(id)) return false;
+        String category = category(id);
+        return !restricts(category) || allowlist.contains(id);
+    }
+
+    public boolean restricts(String category) {
+        return allowlist.stream().anyMatch(entry -> category(entry).equals(category));
+    }
+
+    public <T> List<T> eligible(List<T> candidates, java.util.function.Function<T, Identifier> pageId) {
+        return candidates.stream().filter(candidate -> allows(pageId.apply(candidate))).toList();
+    }
+
+    public <T> List<T> required(List<T> candidates, java.util.function.Function<T, Identifier> pageId,
+                                T fallback) {
+        List<T> eligible = eligible(candidates, pageId);
+        return eligible.isEmpty() ? List.of(fallback) : eligible;
+    }
+
+    private static String category(Identifier id) {
+        String path = id.getPath();
+        if (path.startsWith("biome/") && java.util.Set.of("native", "single", "tiled", "grid",
+                "tiny", "small", "medium", "large", "huge").contains(path.substring("biome/".length())))
+            return "biome_distribution";
+        return path.substring(0, path.indexOf('/') < 0 ? path.length() : path.indexOf('/'));
+    }
+
+    public static Identifier page(String category, Enum<?> value) {
+        return Identifier.fromNamespaceAndPath("rivencraft", category + "/"
+                + value.name().toLowerCase(java.util.Locale.ROOT));
+    }
+}
@@ -19,6 +19,11 @@ public final class PortRandomStructureSelection {
    }

    public static Selection select(MinecraftServer server, long seed, PortAgeTerrain terrain, PortBiomePlan plan) {
+        return select(server, seed, terrain, plan, PortRandomPagePolicy.UNRESTRICTED);
+    }
+
+    public static Selection select(MinecraftServer server, long seed, PortAgeTerrain terrain, PortBiomePlan plan,
+                                   PortRandomPagePolicy policy) {
        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",
@@ -32,7 +37,7 @@ public final class PortRandomStructureSelection {
                            .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)));
+            if (allowed && policy.allows(feature)) eligible.add(new PortRankedChoice.Option<>(feature, rank(name)));
        }
        var random = new Random(seed ^ 0x5354525543545552L);
        int count = random.nextInt(3), dungeons = 0;
@@ -40,6 +40,9 @@ public final class PortSeasonPolicies extends SavedData {
        catch (IllegalArgumentException e) { return null; }
    }
    static Policy select(List<Identifier> pages, long seed, PortAgeTerrain terrain, boolean installed) {
+        return select(pages, seed, terrain, installed, PortRandomPagePolicy.UNRESTRICTED);
+    }
+    static Policy select(List<Identifier> pages, long seed, PortAgeTerrain terrain, boolean installed, PortRandomPagePolicy policy) {
        if (terrain == PortAgeTerrain.CAVE) return new Policy(Mode.NO_SEASONS, true);
        Mode written = null;
        for (var page : pages) if (forPage(page) != null) written = forPage(page);
@@ -49,9 +52,15 @@ public final class PortSeasonPolicies extends SavedData {
        }
        if (!installed) return null;
        // 1.21.1 LegacyRankChoice ranks: Seasons=1, None=2, each Eternal=3.
-        int ticket = new Random(seed ^ 0x5E450A5E5EED21L).nextInt(15);
-        Mode mode = ticket < 6 ? Mode.SEASONS : ticket < 11 ? Mode.NO_SEASONS
-                : List.of(Mode.ETERNAL_WINTER, Mode.ETERNAL_SUMMER, Mode.ETERNAL_FALL, Mode.ETERNAL_SPRING).get(ticket - 11);
+        var modes = List.of(new PortRankedChoice.Option<>(Mode.SEASONS, 1),
+                new PortRankedChoice.Option<>(Mode.NO_SEASONS, 2),
+                new PortRankedChoice.Option<>(Mode.ETERNAL_WINTER, 3),
+                new PortRankedChoice.Option<>(Mode.ETERNAL_SUMMER, 3),
+                new PortRankedChoice.Option<>(Mode.ETERNAL_FALL, 3),
+                new PortRankedChoice.Option<>(Mode.ETERNAL_SPRING, 3));
+        Mode mode = PortRankedChoice.choose(new Random(seed ^ 0x5E450A5E5EED21L),
+                policy.required(modes, option -> PortRandomPagePolicy.page("season", option.value()),
+                        new PortRankedChoice.Option<>(Mode.NO_SEASONS, 2)));
        return new Policy(mode, false);
    }
 }
@@ -26,9 +26,13 @@ public enum PortSkyStyle {
    }

    public static PortSkyStyle resolve(List<Identifier> pages, long seed) {
+        return resolve(pages, seed, PortRandomPagePolicy.UNRESTRICTED);
+    }
+
+    public static PortSkyStyle resolve(List<Identifier> pages, long seed, PortRandomPagePolicy policy) {
        return pages.stream().map(PortSkyStyle::forPage).filter(java.util.Objects::nonNull)
                .findFirst().orElseGet(() -> pages.stream().anyMatch(PortSkyStyle::isCelestial)
-                        ? OVERWORLD : random(seed));
+                        ? OVERWORLD : random(seed, policy));
    }

    /** Nether-style Ages use their fog clear color as the visible backdrop. */
@@ -50,11 +54,17 @@ public enum PortSkyStyle {
        };
    }

-    private static PortSkyStyle random(long seed) {
+    private static PortSkyStyle random(long seed, PortRandomPagePolicy policy) {
        // 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);
+        var styles = policy.required(java.util.stream.IntStream.range(0, 5).boxed()
+                        .filter(slot -> slot != 0 || !policy.restricts("sky")).toList(),
+                slot -> Identifier.fromNamespaceAndPath("rivencraft", "sky/" + switch (slot) {
+                    case 0 -> "inherited"; case 1 -> "overworld"; case 2 -> "nether";
+                    case 3 -> "end"; default -> "static";
+                }), 0);
+        int choice = styles.get(new Random(seed ^ 0x534B5950524F464CL).nextInt(styles.size()));
        return switch (choice) {
            case 0, 1 -> OVERWORLD;
            case 2 -> NETHER;
@@ -169,6 +169,16 @@ public final class RuntimeAgeBackend {
                                     PortTerrainFeaturePlan terrainFeatures, PortWeatherMode weather,
                                     PortLighting lighting, PortSkyStyle sky, PortAgeColors colors, PortDayCycle dayCycle,
                                     List<Identifier> librarySymbols, String displayName) {
+        return create(server, id, seed, biomePlan, terrain, rocks, vegetation, dungeons, lakes, terrainFeatures,
+                weather, lighting, sky, colors, dayCycle, librarySymbols, displayName, PortRandomPagePolicy.UNRESTRICTED);
+    }
+
+    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,
+                                     List<Identifier> librarySymbols, String displayName, PortRandomPagePolicy policy) {
        checkServerThread(server);
        String name = ageName(id);
        AgeLevelIndex index = index(server);
@@ -186,7 +196,7 @@ public final class RuntimeAgeBackend {
        ServerLevel level = null;
        try {
            seasons.put(id, PortSeasonPolicies.select(librarySymbols, seed, terrain,
-                    net.dnorberg.rivencraft.compat.SereneSeasonsCompatibility.available()));
+                    net.dnorberg.rivencraft.compat.SereneSeasonsCompatibility.available(), policy));
            writing.put(id, librarySymbols);
            level = load(server, id, seed, biomePlan, terrain, rocks, vegetation, dungeons, lakes,
                    terrainFeatures, lighting, sky, colors, dayCycle);
@@ -396,6 +406,23 @@ public final class RuntimeAgeBackend {
        return index(server).dayCycles();
    }

+    /** Snapshot only loaded Age settings; viewing a book never loads its destination. */
+    public static Map<Identifier, PortAgeDescription> loadedDescriptions(MinecraftServer server) {
+        checkServerThread(server);
+        AgeLevelIndex index = index(server);
+        var descriptions = new java.util.HashMap<Identifier, PortAgeDescription>();
+        var knownAges = index.entries().keySet();
+        for (var level : server.getAllLevels()) {
+            Identifier id = level.dimension().identifier();
+            if (!(level instanceof PortAgeLevel age) || !knownAges.contains(id)) continue;
+            PortBiomePlan biomes = index.biomePlan(id);
+            descriptions.put(id, new PortAgeDescription(index.terrain(id),
+                    biomes == null ? PortBiomePlan.Distribution.NATIVE : biomes.distribution(),
+                    index.lighting(id), age.weatherMode()));
+        }
+        return Map.copyOf(descriptions);
+    }
+
    /** Includes retired IDs, which must never be silently reused by a new book. */
    public static boolean isNameTaken(MinecraftServer server, Identifier id) {
        checkServerThread(server);
@@ -40,7 +40,8 @@ public final class CrystalPortalBlock extends BaseEntityBlock {
    @Override protected RenderShape getRenderShape(BlockState state) {
        // Keep the animated fallback until the optional destination view has
        // actually been established, including after a world restart.
-        return RenderShape.MODEL;
+        return net.dnorberg.rivencraft.compat.RebornBookPreviews.available() && state.getValue(LIVE_VIEW)
+                ? RenderShape.INVISIBLE : RenderShape.MODEL;
    }
    @Override public BlockEntity newBlockEntity(BlockPos pos, BlockState state) {
        return new CrystalPortalBlockEntity(pos, state);
@@ -25,7 +25,10 @@ public final class BookReceptacleBlockEntity extends BlockEntity {
    public ItemStack getBook() { return book; }
    public int skyColor() { return skyColor; }
    public void setBook(ItemStack value) {
+        if (level instanceof ServerLevel server)
+            net.dnorberg.rivencraft.compat.RebornCrystalPortals.remove(server, worldPosition);
        book = value.copyWithCount(1);
+        restore = true;
        skyColor = 0xffffff;
        if (level instanceof ServerLevel source) {
            var destination = book.get(Rivencraft.LINK_BOOK_TARGET.get());
@@ -53,7 +56,11 @@ public final class BookReceptacleBlockEntity extends BlockEntity {
        }
        sync();
    }
-    public ItemStack takeBook() { ItemStack result = book; book = ItemStack.EMPTY; skyColor = 0xffffff; sync(); return result; }
+    public ItemStack takeBook() {
+        if (level instanceof ServerLevel server)
+            net.dnorberg.rivencraft.compat.RebornCrystalPortals.remove(server, worldPosition);
+        ItemStack result = book; book = ItemStack.EMPTY; skyColor = 0xffffff; sync(); return result;
+    }
    private void sync() {
        setChanged();
        if (level != null && !level.isClientSide()) {
@@ -73,6 +80,7 @@ public final class BookReceptacleBlockEntity extends BlockEntity {
        boolean restoring = holder.restore;
        if (restoring && !plan.valid() && CrystalPortalNetwork.recoverSavedOwners(level, pos))
            plan = CrystalPortalNetwork.plan(level, pos);
+        if (restoring && plan.valid()) CrystalPortalNetwork.setLiveView(level, plan, false);
        CrystalPortalNetwork.reconcile(level, pos, plan);
        holder.restore = false;
        if (restoring) holder.sync();
@@ -20,12 +20,15 @@ public final class AgeCatalogClient {

    @SubscribeEvent
    public static void logout(net.neoforged.neoforge.client.event.ClientPlayerNetworkEvent.LoggingOut event) {
+        PortBookPreview.logout();
        net.dnorberg.rivencraft.age.PortAgeColors.updateClient(java.util.Map.of());
        net.dnorberg.rivencraft.age.PortDayCycle.updateClient(java.util.Map.of());
+        net.dnorberg.rivencraft.age.PortAgeDescription.updateClient(java.util.Map.of());
    }

    @SubscribeEvent
    public static void register(RegisterClientPayloadHandlersEvent event) {
+        event.register(net.dnorberg.rivencraft.network.BookPreviewPayload.TYPE, (payload, context) -> PortBookPreview.accept(payload));
        event.register(net.dnorberg.rivencraft.network.WritingDeskCatalogPayload.TYPE, ClientWritingDeskCatalog::handle);
        event.register(net.dnorberg.rivencraft.network.SereneAgeWhitelistPayload.TYPE, (payload, context) ->
                net.dnorberg.rivencraft.compat.SereneSeasonsCompatibility.acceptClient(payload.dimensionId(), payload.enabled()));
@@ -33,6 +36,7 @@ public final class AgeCatalogClient {
            if (!(context.listener() instanceof ClientPacketListener listener)) return;
            net.dnorberg.rivencraft.age.PortAgeColors.updateClient(payload.colors());
            net.dnorberg.rivencraft.age.PortDayCycle.updateClient(payload.dayCycles());
+            net.dnorberg.rivencraft.age.PortAgeDescription.updateClient(payload.descriptions());
            if (listener.getLevel() != null) {
                listener.getLevel().environmentAttributes().invalidateTickCache();
                listener.getLevel().updateSkyBrightness();
@@ -0,0 +1,79 @@
+package net.dnorberg.rivencraft.client;
+
+import java.util.UUID;
+import net.dnorberg.rivencraft.PortConfig;
+import net.dnorberg.rivencraft.compat.RebornBookPreviews;
+import net.dnorberg.rivencraft.network.*;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.gui.GuiGraphicsExtractor;
+import net.minecraft.client.multiplayer.ClientLevel;
+import net.minecraft.core.BlockPos;
+import net.minecraft.world.InteractionHand;
+import net.minecraft.world.item.ItemStack;
+import net.neoforged.neoforge.client.network.ClientPacketDistributor;
+
+/** One session per open book; stale replies cannot replace another book's preview. */
+public final class PortBookPreview {
+    interface LivePanel {
+        void accept(net.dnorberg.rivencraft.item.LinkBookTarget destination);
+        boolean render(GuiGraphicsExtractor graphics, int x, int y, int width, int height, float time);
+        void close();
+    }
+    private static PortBookPreview active;
+    private final UUID session = UUID.randomUUID();
+    private final RequestBookPreviewPayload request;
+    private final LivePanel live;
+    private int ticks;
+    private boolean received;
+    private boolean closed;
+    private net.minecraft.resources.Identifier destination;
+
+    PortBookPreview(InteractionHand hand, ItemStack book, UseBookStandPayload stand) {
+        var minecraft = Minecraft.getInstance();
+        request = minecraft.level == null ? null : new RequestBookPreviewPayload(session,
+                hand == InteractionHand.OFF_HAND, stand != null, minecraft.level.dimension().identifier(),
+                stand == null ? BlockPos.ZERO : stand.pos(), book.copy());
+        boolean enabled = RebornBookPreviews.available() && PortConfig.LIVE_BOOK_PREVIEWS.get();
+        live = enabled ? new RebornLiveBookPanel() : null;
+        if (active != null) active.close();
+        active = this;
+        sendRequest();
+    }
+
+    private void sendRequest() {
+        if (!closed && live != null && request != null && Minecraft.getInstance().getConnection() != null)
+            ClientPacketDistributor.sendToServer(request);
+    }
+    void tick() {
+        ticks++;
+        if (ticks % (received ? 200 : 40) == 0) sendRequest();
+    }
+    boolean render(GuiGraphicsExtractor graphics, int x, int y, int width, int height, float partialTick) {
+        if (closed || !received || live == null) return false;
+        return live.render(graphics, x, y, width, height, ticks + partialTick);
+    }
+    public static void accept(BookPreviewPayload payload) {
+        if (active == null || active.closed || active.live == null || !active.session.equals(payload.session())
+                || !payload.destination().valid()) return;
+        active.destination = payload.destination().dimension();
+        active.received = true;
+        active.live.accept(payload.destination());
+    }
+    void close() {
+        if (closed) return;
+        closed = true;
+        if (live != null) {
+            live.close();
+            if (Minecraft.getInstance().getConnection() != null)
+                ClientPacketDistributor.sendToServer(new ReleaseBookPreviewPayload(session));
+        }
+        if (active == this) active = null;
+    }
+    public static void logout() { if (active != null) active.close(); }
+    public static boolean shouldMute(ClientLevel level) {
+        var player = Minecraft.getInstance().player;
+        return active != null && !active.closed && active.destination != null
+                && level.dimension().identifier().equals(active.destination)
+                && (player == null || level != player.level());
+    }
+}
@@ -15,7 +15,7 @@ import net.minecraft.world.InteractionHand;
 import net.minecraft.world.item.ItemStack;
 import net.neoforged.neoforge.client.network.ClientPacketDistributor;

-/** Legacy book layout and authored glyph pages; destination rendering remains a port placeholder. */
+/** Legacy book spreads, authored symbol pages and random-Age glyph descriptions. */
 public final class PortDescriptiveBookScreen extends Screen {
    private static final int WIDTH = 327;
    private static final int HEIGHT = 199;
@@ -23,7 +23,9 @@ public final class PortDescriptiveBookScreen extends Screen {


    private final InteractionHand hand;
+    private final ItemStack book;
    private final boolean bound;
+    private final net.minecraft.resources.Identifier ageId;
    private final PortLegacyLinkPanel linkPanel = new PortLegacyLinkPanel();
    private final net.dnorberg.rivencraft.writing.DescriptiveBookPages pages;
    private int pageIndex;
@@ -33,8 +35,10 @@ public final class PortDescriptiveBookScreen extends Screen {
    public PortDescriptiveBookScreen(InteractionHand hand, ItemStack book) {
        super(book.getHoverName());
        this.hand = hand;
+        this.book = book.copy();
        pages = net.dnorberg.rivencraft.writing.DescriptiveBookPages.from(book);
-        bound = book.has(Rivencraft.AGE_BOOK_ID.get());
+        ageId = book.get(Rivencraft.AGE_BOOK_ID.get());
+        bound = ageId != null;
    }

    public PortDescriptiveBookScreen(net.dnorberg.rivencraft.network.UseBookStandPayload source) {
@@ -44,7 +48,8 @@ public final class PortDescriptiveBookScreen extends Screen {

    @Override
    protected void init() {
-        if (bound || standSource != null) return;
+        if (bound) { linkPanel.open(hand, book, standSource); return; }
+        if (standSource != null) return;
        int left = (width - WIDTH) / 2;
        int top = (height - HEIGHT) / 2;
        titleInput = new EditBox(font, left + 40, top + 69, 110, 20,
@@ -78,7 +83,9 @@ public final class PortDescriptiveBookScreen extends Screen {
                int textY = PortLegacyBookArtwork.drawText(graphics, font, title, left + 40, top + 40, 110, TEXT_COLOR);
                Component author = pages.author().isBlank()
                        ? Component.translatable("screen.rivencraft.age.unknown_author") : Component.literal(pages.author());
-                PortLegacyBookArtwork.drawText(graphics, font, author, left + 50, textY + 2, 100, TEXT_COLOR);
+                int detailsY = PortLegacyBookArtwork.drawText(graphics, font, author,
+                        left + 50, textY + 2, 100, TEXT_COLOR) + 4;
+                if (pages.symbols().isEmpty()) drawRandomDescription(graphics, left + 40, detailsY);
                graphics.disableScissor();
            } else {
                graphics.text(font, title, left + 42, top + 29, TEXT_COLOR, false);
@@ -105,6 +112,32 @@ public final class PortDescriptiveBookScreen extends Screen {
        super.extractRenderState(graphics, mouseX, mouseY, partialTick);
    }

+    private void drawRandomDescription(GuiGraphicsExtractor graphics, int x, int y) {
+        var description = net.dnorberg.rivencraft.age.PortAgeDescription.forClient(ageId);
+        if (description == null) return;
+        var cycle = net.dnorberg.rivencraft.age.PortDayCycle.forClient(ageId);
+        var lines = java.util.List.of(
+                Component.translatable("screen.rivencraft.age.generator",
+                        Component.translatable("generator.rivencraft." + description.terrain().name().toLowerCase(java.util.Locale.ROOT))),
+                Component.translatable("screen.rivencraft.age.trait.biomes", trait("biome_distribution", description.distribution())),
+                Component.translatable("screen.rivencraft.age.trait.lighting", trait("lighting", description.lighting())),
+                Component.translatable("screen.rivencraft.age.trait.weather", trait("weather", description.weather())),
+                Component.translatable("screen.rivencraft.age.trait.day_length", cycle.period() == 0
+                        ? Component.translatable("trait.rivencraft.day_length.stopped")
+                        : Component.literal(String.format(java.util.Locale.ROOT, "%.2fx", cycle.period()))),
+                Component.translatable("screen.rivencraft.age.trait.celestial_angle",
+                        Component.literal(String.format(java.util.Locale.ROOT, "%.0f°", (float) cycle.bearing()))),
+                Component.translatable("screen.rivencraft.age.trait.celestial_phase",
+                        Component.literal(String.format(java.util.Locale.ROOT, "%.0f%%", cycle.phaseTick() * 100F / 24000F))));
+        for (var line : lines)
+            y = PortSymbolPageTextures.drawGlyphText(graphics, line.getString(), x, y, 110) + 2;
+    }
+
+    private static Component trait(String group, Enum<?> value) {
+        return Component.translatable("trait.rivencraft." + group + "."
+                + value.name().toLowerCase(java.util.Locale.ROOT));
+    }
+
    @Override
    public boolean mouseClicked(MouseButtonEvent event, boolean doubleClick) {
        if (event.button() == InputConstants.MOUSE_BUTTON_LEFT) {
@@ -152,6 +185,8 @@ public final class PortDescriptiveBookScreen extends Screen {
        if (bound) linkPanel.tick();
    }

+    @Override public void removed() { linkPanel.close(); super.removed(); }
+
    @Override
    public boolean isPauseScreen() {
        return false;
@@ -14,6 +14,13 @@ final class PortLegacyLinkPanel {
    private static final int CELL_SIZE = 3;
    private static final int BORDER_COLOR = 0xFF7B6AA8;
    private int ticks;
+    private PortBookPreview preview;
+    void open(net.minecraft.world.InteractionHand hand, net.minecraft.world.item.ItemStack book,
+              net.dnorberg.rivencraft.network.UseBookStandPayload stand) {
+        if (preview == null) preview = new PortBookPreview(hand, book, stand);
+    }
+    void close() { if (preview != null) preview.close(); }
+
    private static final int LINK_COLOR = 0xFF006666;

    static boolean contains(double x, double y) {
@@ -26,9 +33,11 @@ final class PortLegacyLinkPanel {

    void tick() {
        ticks++;
+        if (preview != null) preview.tick();
    }

    private void render(GuiGraphicsExtractor graphics, int left, int top, int width, int height, float partialTick) {
+        if (preview != null && preview.render(graphics, left, top, width, height, partialTick)) return;
        graphics.fill(left, top, left + width, top + height, 0xFF000011);

        float time = (ticks + partialTick) * 0.035F;
@@ -23,6 +23,7 @@ public final class PortLinkingBookScreen extends Screen {


    private final InteractionHand hand;
+    private final ItemStack book;
    private final boolean bound;
    private final net.dnorberg.rivencraft.item.LinkBookTarget target;
    private final boolean returnLink;
@@ -35,6 +36,7 @@ public final class PortLinkingBookScreen extends Screen {
    public PortLinkingBookScreen(InteractionHand hand, ItemStack book) {
        super(book.getHoverName());
        this.hand = hand;
+        this.book = book.copy();
        target = book.get(Rivencraft.LINK_BOOK_TARGET.get());
        bound = target != null;
        destination = bound ? net.dnorberg.rivencraft.item.LinkingBookItem.destinationName(book, target) : Component.empty();
@@ -51,7 +53,8 @@ public final class PortLinkingBookScreen extends Screen {

    @Override
    protected void init() {
-        if (bound || standSource != null) return;
+        if (bound) { linkPanel.open(hand, book, standSource); return; }
+        if (standSource != null) return;
        int left = (width - WIDTH) / 2;
        int top = (height - HEIGHT) / 2;
        titleInput = new EditBox(font, left + 40, top + 69, 110, 20,
@@ -147,6 +150,8 @@ public final class PortLinkingBookScreen extends Screen {
        if (bound) linkPanel.tick();
    }

+    @Override public void removed() { linkPanel.close(); super.removed(); }
+
    @Override
    public boolean isPauseScreen() {
        return false;
@@ -183,6 +183,36 @@ public final class PortSymbolPageTextures {
        return result;
    }

+    /** Translated prose becomes Legacy word glyphs, with genuine base-25 numerals. */
+    public static int drawGlyphText(net.minecraft.client.gui.GuiGraphicsExtractor graphics,
+                                    String text, int x, int y, int maxWidth) {
+        var layout = net.dnorberg.rivencraft.writing.PortGlyphTextLayout.layout(text, maxWidth, 12);
+        for (var glyph : layout.glyphs()) {
+            int number = net.dnorberg.rivencraft.writing.PortGlyphTextLayout.number(glyph.word());
+            if (number >= 0) drawNumeral(graphics, number, x + glyph.x(), y + glyph.y(), 12);
+            else for (int component : glyphs(glyph.word()))
+                drawComponent(graphics, component, x + glyph.x(), y + glyph.y(), 12);
+        }
+        return y + layout.height();
+    }
+
+    public static void drawNumeral(net.minecraft.client.gui.GuiGraphicsExtractor graphics,
+                                   int number, int x, int y, int size) {
+        int[] digits = PortSymbolNumerals.digitsFor(number);
+        int digitSize = digits.length == 1 ? size : Math.max(8, size * 3 / 4);
+        for (int digit : digits) {
+            for (int component : PortSymbolNumerals.componentsForDigit(digit))
+                drawComponent(graphics, component, x, y + (size - digitSize) / 2, digitSize);
+            x += digitSize + 1;
+        }
+    }
+
+    private static void drawComponent(net.minecraft.client.gui.GuiGraphicsExtractor graphics,
+                                      int component, int x, int y, int size) {
+        graphics.blit(net.minecraft.client.renderer.RenderPipelines.GUI_TEXTURED, COMPONENTS, x, y,
+                (component % 8) * 64, (component / 8) * 64, size, size, 64, 64, 512, 512, 0xFF211A14);
+    }
+
    private static Identifier texture(String path) {
        return Identifier.fromNamespaceAndPath(Rivencraft.MOD_ID, "textures/" + path + ".png");
    }
@@ -0,0 +1,79 @@
+package net.dnorberg.rivencraft.client;
+
+import com.mojang.blaze3d.pipeline.RenderTarget;
+import com.mojang.blaze3d.pipeline.TextureTarget;
+import com.mojang.blaze3d.systems.RenderSystem;
+import com.mojang.renderpearl.api.GpuFormat;
+import com.mojang.renderpearl.api.textures.FilterMode;
+import net.dnorberg.rivencraft.item.LinkBookTarget;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.gui.GuiGraphicsExtractor;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.registries.Registries;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.world.phys.Vec3;
+import org.joml.Matrix4f;
+import org.joml.Vector4f;
+import qouteall.imm_ptl.core.ClientWorldLoader;
+import qouteall.imm_ptl.core.render.GuiPortalRendering;
+import qouteall.imm_ptl.core.render.context_management.WorldRenderInfo;
+
+/** Reborn renders before GUI drawing; the deferred GUI samples its target normally. */
+public final class RebornLiveBookPanel implements PortBookPreview.LivePanel {
+    // The engine retains queued tasks. Keep one reusable target alive across screen
+    // removal instead of deleting textures still referenced by a queued GUI frame.
+    private static RenderTarget target;
+    private static RebornLiveBookPanel queued;
+    private LinkBookTarget destination;
+    private boolean closed;
+
+    @Override public void accept(LinkBookTarget value) { destination = value; }
+    @Override public boolean render(GuiGraphicsExtractor graphics, int x, int y, int width, int height, float time) {
+        if (closed || destination == null || !ClientWorldLoader.getIsInitialized()) return false;
+        var key = ResourceKey.create(Registries.DIMENSION, destination.dimension());
+        var world = ClientWorldLoader.getWorld(key);
+        if (world == null || !world.hasChunkAt(BlockPos.containing(destination.x(), destination.y(), destination.z()))) return false;
+        var minecraft = Minecraft.getInstance();
+        var main = minecraft.gameRenderer.mainRenderTarget();
+        if (target == null) target = new TextureTarget("Rivencraft live book", main.width, main.height,
+                GpuFormat.RGBA8_UNORM, main.getDepthTexture().getFormat());
+        Vec3 center = new Vec3(destination.x(), destination.y() + 2.5, destination.z());
+        double angle = time * 0.012;
+        Vec3 camera = center.add(Math.sin(angle) * 11, 5, Math.cos(angle) * 11);
+        Matrix4f transform = new Matrix4f().rotateX((float) Math.toRadians(20))
+                .rotateY((float) angle);
+        var info = new WorldRenderInfo.Builder().setWorld(world).setCameraPos(camera)
+                .setCameraTransformation(transform).setOverwriteCameraTransformation(true)
+                .setRenderDistance(Math.min(8, minecraft.options.getEffectiveRenderDistance()))
+                .setDoRenderHand(false).setEnableViewBobbing(false).setDoRenderSky(true).setHasFog(true).build();
+        // Submit first: Reborn may resize the target, invalidating its old texture view.
+        // GPU clearing happens in beginRender(), after extraction but before remote rendering.
+        GuiPortalRendering.submitNextFrameRendering(info, target);
+        queued = this;
+        graphics.blit(target.getColorTextureView(), RenderSystem.getSamplerCache().getClampToEdge(FilterMode.LINEAR),
+                x, y, x + width, y + height, 0, 1, 1, 0);
+        graphics.outline(x, y, width, height, 0xFF7B6AA8);
+        return true;
+    }
+
+    /** Called by the optional engine mixin on the render thread, never during GUI drawing. */
+    public static void beginRender() {
+        if (queued == null || target == null) return;
+        RenderSystem.getDevice().createCommandEncoder().clearColorAndDepthTextures(
+                target.getColorTexture(), new Vector4f(0, 0, 0, 1), target.getDepthTexture(), 0.0);
+    }
+
+    /** Remote render changes the shared camera; restore it before rain/audio use it. */
+    public static void endRender() {
+        if (queued == null) return;
+        queued = null;
+        var minecraft = Minecraft.getInstance();
+        if (minecraft.level != null && minecraft.getCameraEntity() != null) {
+            var camera = minecraft.gameRenderer.mainCamera();
+            camera.setLevel(minecraft.level);
+            camera.setEntity(minecraft.getCameraEntity());
+            camera.update(minecraft.getDeltaTracker());
+        }
+    }
+    @Override public void close() { closed = true; destination = null; }
+}
@@ -294,15 +294,7 @@ public final class WritingDeskScreen extends AbstractContainerScreen<WritingDesk
    }

    private static void drawNumeral(GuiGraphicsExtractor graphics, int number, int x, int y, int size) {
-        int[] digits = net.dnorberg.rivencraft.writing.PortSymbolNumerals.digitsFor(number);
-        int digitSize = digits.length == 1 ? size : Math.max(8, size * 3 / 4);
-        Identifier components = Identifier.fromNamespaceAndPath("rivencraft", "textures/gui/symbolcomponents.png");
-        for (int digit : digits) {
-            for (int component : net.dnorberg.rivencraft.writing.PortSymbolNumerals.componentsForDigit(digit))
-                graphics.blit(RenderPipelines.GUI_TEXTURED, components, x, y + (size - digitSize) / 2,
-                        (component % 8) * 64, (component / 8) * 64, digitSize, digitSize, 64, 64, 512, 512, 0xFF211A14);
-            x += digitSize + 1;
-        }
+        PortSymbolPageTextures.drawNumeral(graphics, number, x, y, size);
    }

    private DisplayPage pageAtMouse(double mouseX, double mouseY) {
@@ -0,0 +1,38 @@
+package net.dnorberg.rivencraft.compat;
+
+import net.dnorberg.rivencraft.Rivencraft;
+import net.minecraft.server.MinecraftServer;
+import net.neoforged.fml.ModList;
+import net.neoforged.neoforge.event.server.ServerStartedEvent;
+
+/** Optional 26.3 Immersive Portals forks; only the guarded adapter links their API classes. */
+public final class ImmersivePortalsCompatibility {
+    private ImmersivePortalsCompatibility() {}
+
+    public static boolean available() { return ModList.get().isLoaded("seamlessportals") || ModList.get().isLoaded("immersive_portals_reborn"); }
+
+    public static boolean synchronize(MinecraftServer server) { return synchronize(server, null); }
+
+    /** Login/catalog packets must precede Rivencraft's acknowledgement round trip. */
+    public static boolean beforeCatalog(net.minecraft.server.level.ServerPlayer player) {
+        return synchronize(player.level().getServer(), player);
+    }
+
+    private static boolean synchronize(MinecraftServer server, net.minecraft.server.level.ServerPlayer player) {
+        if (!available()) return true;
+        if (!server.isSameThread()) throw new IllegalStateException("Portal catalog update outside server thread");
+        try {
+            ImmersivePortalsDimensionAdapter.synchronize(server);
+            if (player != null) ImmersivePortalsDimensionAdapter.sendTo(player);
+            return true;
+        } catch (RuntimeException | LinkageError failure) {
+            Rivencraft.LOGGER.error("Could not synchronize the optional Immersive Portals dimension IDs; "
+                    + "Rivencraft catalog acknowledgement/travel remains blocked until synchronization succeeds", failure);
+            return false;
+        }
+    }
+
+    public static void onServerStarted(ServerStartedEvent event) {
+        synchronize(event.getServer());
+    }
+}
@@ -0,0 +1,32 @@
+package net.dnorberg.rivencraft.compat;
+
+import java.util.Set;
+import net.minecraft.server.MinecraftServer;
+import qouteall.q_misc_util.dimension.DimensionIntId;
+
+/** Updates the shared 26.3 dimension catalog without delegating Age construction. */
+final class ImmersivePortalsDimensionAdapter {
+    private ImmersivePortalsDimensionAdapter() {}
+
+    static void sendTo(net.minecraft.server.level.ServerPlayer player) {
+        // Seamless's createPacket returns a vanilla Packet; Reborn's returns
+        // a CustomPacketPayload. Their createFromServer factory is shared and
+        // retains each fork's native (two- or three-tag) wire format.
+        player.connection.send(new net.minecraft.network.protocol.common.ClientboundCustomPayloadPacket(
+                qouteall.q_misc_util.MiscNetworking.DimIdSyncPacket.createFromServer(
+                        player.level().getServer())));
+    }
+
+    static void synchronize(MinecraftServer server) {
+        var live = Set.copyOf(server.levelKeys());
+        var record = DimensionIntId.getServerMap(server);
+        if (record.getDimIdSet().equals(live)) return;
+        // This is the same public synchronization entry point called by its
+        // dynamic-update listener. The two supported forks have
+        // different event wrappers, but share this method. It updates IDs and
+        // sends native type/sea-level metadata before Rivencraft's catalog.
+        DimensionIntId.onServerDimensionChanged(server);
+        if (!DimensionIntId.getServerMap(server).getDimIdSet().equals(live))
+            throw new IllegalStateException("The portal mod did not accept the current server dimensions");
+    }
+}
@@ -0,0 +1,35 @@
+package net.dnorberg.rivencraft.compat;
+
+import net.dnorberg.rivencraft.Rivencraft;
+import net.dnorberg.rivencraft.network.RequestBookPreviewPayload;
+import net.minecraft.server.level.ServerPlayer;
+import net.neoforged.fml.ModList;
+import net.neoforged.neoforge.common.NeoForge;
+
+/** No optional API appears in common class signatures. */
+public final class RebornBookPreviews {
+    public static boolean available() { return ModList.get().isLoaded("immersive_portals_reborn"); }
+    public static void open(ServerPlayer player, RequestBookPreviewPayload payload) {
+        if (!available()) return;
+        try { RebornPreviewChunks.open(player, payload); }
+        catch (RuntimeException | LinkageError error) {
+            Rivencraft.LOGGER.warn("Reborn book preview unavailable; retaining animated panel", error);
+            RebornPreviewChunks.close(player);
+        }
+    }
+    public static void release(ServerPlayer player, java.util.UUID session) {
+        if (available()) RebornPreviewChunks.release(player, session);
+    }
+    public static void register() {
+        if (!available()) return;
+        NeoForge.EVENT_BUS.addListener((net.neoforged.neoforge.event.tick.ServerTickEvent.Post event) -> RebornPreviewChunks.tick(event.getServer()));
+        NeoForge.EVENT_BUS.addListener((net.neoforged.neoforge.event.entity.player.PlayerEvent.PlayerLoggedOutEvent event) -> {
+            if (event.getEntity() instanceof ServerPlayer player) RebornPreviewChunks.logout(player);
+        });
+        NeoForge.EVENT_BUS.addListener((net.neoforged.neoforge.event.entity.player.PlayerEvent.PlayerChangedDimensionEvent event) -> {
+            if (event.getEntity() instanceof ServerPlayer player) RebornPreviewChunks.close(player);
+        });
+        NeoForge.EVENT_BUS.addListener((net.neoforged.neoforge.event.server.ServerStoppingEvent event) -> RebornPreviewChunks.stop());
+    }
+    private RebornBookPreviews() {}
+}
@@ -0,0 +1,30 @@
+package net.dnorberg.rivencraft.compat;
+
+import net.dnorberg.rivencraft.PortConfig;
+import net.dnorberg.rivencraft.Rivencraft;
+import net.dnorberg.rivencraft.portal.CrystalPortalNetwork;
+import net.minecraft.core.BlockPos;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.item.ItemStack;
+
+/** Render-only optional integration. Crystal portal blocks retain all travel rules. */
+public final class RebornCrystalPortals {
+    public static void refresh(ServerLevel source, BlockPos owner, CrystalPortalNetwork.Plan plan, ItemStack book) {
+        boolean live = false;
+        if (RebornBookPreviews.available()) {
+            try {
+                if (!book.isEmpty() && PortConfig.CRYSTAL_LIVE_VIEWS.get())
+                    live = RebornCrystalView.refresh(source, owner, plan, book);
+                else RebornCrystalView.remove(source, owner);
+            } catch (RuntimeException | LinkageError failure) {
+                Rivencraft.LOGGER.warn("Could not establish Reborn crystal view at {}; retaining portal travel and fallback", owner, failure);
+                RebornCrystalView.remove(source, owner);
+            }
+        }
+        CrystalPortalNetwork.setLiveView(source, plan, live);
+    }
+    public static void remove(ServerLevel source, BlockPos owner) {
+        if (RebornBookPreviews.available()) RebornCrystalView.remove(source, owner);
+    }
+    private RebornCrystalPortals() {}
+}
@@ -0,0 +1,131 @@
+package net.dnorberg.rivencraft.compat;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import net.dnorberg.rivencraft.Rivencraft;
+import net.dnorberg.rivencraft.item.LinkBookTarget;
+import net.dnorberg.rivencraft.item.LinkProperties;
+import net.dnorberg.rivencraft.portal.CrystalPortalNetwork;
+import net.dnorberg.rivencraft.portal.CrystalPortalSurfaces;
+import net.dnorberg.rivencraft.portal.PortalBookTravel;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.Direction;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.entity.EntitySpawnReason;
+import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.phys.AABB;
+import net.minecraft.world.phys.Vec3;
+import qouteall.imm_ptl.core.api.PortalAPI;
+import qouteall.imm_ptl.core.portal.Portal;
+import qouteall.imm_ptl.core.portal.shape.SpecialFlatPortalShape;
+import qouteall.q_misc_util.my_util.DQuaternion;
+import qouteall.q_misc_util.my_util.Mesh2D;
+
+/** One native mesh per coplanar opening/side, not one repeated image per block. */
+final class RebornCrystalView {
+    private static final String PREFIX = "rivencraft:crystal:mc263:v1:";
+    private record View(CrystalPortalSurfaces.Surface surface, Direction normal,
+                        LinkBookTarget target, boolean preserveFacing, boolean relative, String tag) {}
+
+    static boolean refresh(ServerLevel source, BlockPos owner, CrystalPortalNetwork.Plan plan, ItemStack book) {
+        List<View> wanted = views(source, owner, plan, book);
+        if (wanted.isEmpty()) { remove(source, owner); return false; }
+        if (!complete(source, owner, wanted)) {
+            remove(source, owner);
+            for (View view : wanted) spawn(source, view);
+        }
+        return complete(source, owner, wanted);
+    }
+
+    private static List<View> views(ServerLevel source, BlockPos owner, CrystalPortalNetwork.Plan plan, ItemStack book) {
+        List<View> views = new ArrayList<>();
+        boolean descriptive = book.is(Rivencraft.DESCRIPTIVE_BOOK.get());
+        boolean relative = book.getOrDefault(Rivencraft.LINK_PROPERTIES.get(), LinkProperties.NONE).has(LinkProperties.RELATIVE_LINK);
+        // Ordinary descriptive arrival searches once, not for each side of each opening.
+        LinkBookTarget shared = relative ? null : PortalBookTravel.destination(source, book, owner, 0, 0);
+        if (!relative && (shared == null || !shared.valid())) return List.of();
+        for (var surface : CrystalPortalSurfaces.group(source, plan)) {
+            LinkBookTarget target = relative
+                    ? PortalBookTravel.destination(source, book, BlockPos.containing(surface.bounds().getCenter()), 0, 0) : shared;
+            if (target == null || !target.valid()) return List.of();
+            int shape = surface.cells().stream().mapToLong(BlockPos::asLong).sorted().boxed().toList().hashCode();
+            for (Direction normal : List.of(surface.normal(), surface.normal().getOpposite())) {
+                String tag = ownerTag(owner) + normal.getSerializedName() + ":" + shape + ":" + target + ":" + descriptive + ":" + relative;
+                views.add(new View(surface, normal, target, descriptive, relative, tag));
+            }
+        }
+        return List.copyOf(views);
+    }
+
+    static void remove(ServerLevel source, BlockPos owner) {
+        for (Portal portal : existing(source, owner)) portal.discard();
+    }
+    private static List<Portal> existing(ServerLevel source, BlockPos owner) {
+        String prefix = ownerTag(owner);
+        return source.getEntitiesOfClass(Portal.class,
+                new AABB(owner).inflate(CrystalPortalNetwork.MAX_RADIUS + 2),
+                entity -> entity.portalTag != null && entity.portalTag.startsWith(prefix));
+    }
+    private static boolean complete(ServerLevel source, BlockPos owner, List<View> wanted) {
+        List<Portal> existing = existing(source, owner);
+        if (existing.size() != wanted.size()) return false;
+        var tags = new HashSet<String>();
+        for (Portal view : existing) {
+            if (view.getTeleportable() || view.isInteractable() || !view.isPortalValid()
+                    || !tags.add(view.portalTag)) return false;
+        }
+        return tags.equals(wanted.stream().map(View::tag).collect(java.util.stream.Collectors.toSet()));
+    }
+
+    private static void spawn(ServerLevel source, View view) {
+        Portal portal = Portal.ENTITY_TYPE.create(source, EntitySpawnReason.TRIGGERED);
+        if (portal == null) return;
+        var surface = view.surface();
+        var normal = view.normal();
+        var target = view.target();
+        PortalAPI.setPortalOrthodoxShape(portal, normal, surface.bounds());
+        // Inside the opening's block thickness, so crystal frame edges stay in front.
+        portal.setOriginPos(portal.getOriginPos().add(normal.getUnitVec3().scale(-0.125)));
+        Mesh2D mesh = new Mesh2D();
+        double halfU = 1 / portal.getWidth(), halfV = 1 / portal.getHeight();
+        for (BlockPos cell : surface.cells()) {
+            Vec3 face = Vec3.atCenterOf(cell).add(normal.getUnitVec3().scale(0.5));
+            Vec3 offset = face.subtract(portal.getOriginPos());
+            double u = 2 * offset.dot(portal.getAxisW()) / portal.getWidth();
+            double v = 2 * offset.dot(portal.getAxisH()) / portal.getHeight();
+            mesh.addQuad(u - halfU, v - halfV, u + halfU, v + halfV);
+        }
+        portal.setPortalShape(new SpecialFlatPortalShape(mesh));
+        // Descriptive Book travel retains the approaching entity's yaw/pitch.
+        // Linking Books rotate the approach normal onto their written facing.
+        DQuaternion rotation = view.preserveFacing() ? DQuaternion.identity : cameraRotation(normal, target);
+        Vec3 eye = new Vec3(target.x(), target.y() + 1.62, target.z());
+        // Anchor a standing player's eyes above the opening's floor rather than
+        // above the mesh center (which changes when the frame is made taller).
+        Vec3 anchor = surface.bounds().getCenter();
+        if (normal.getAxis().isHorizontal()) anchor = new Vec3(anchor.x, surface.bounds().minY + 1.62, anchor.z);
+        else anchor = anchor.add(0, 1.62, 0);
+        Vec3 destination = eye.subtract(rotation.rotate(anchor.subtract(portal.getOriginPos())));
+        PortalAPI.setPortalTransformation(portal,
+                net.minecraft.resources.ResourceKey.create(net.minecraft.core.registries.Registries.DIMENSION, target.dimension()),
+                destination, rotation, 1);
+        portal.setTeleportable(false);
+        portal.setInteractable(false);
+        portal.setCrossPortalCollisionEnabled(false);
+        portal.portalTag = view.tag();
+        PortalAPI.spawnServerEntity(portal);
+    }
+
+    private static DQuaternion cameraRotation(Direction normal, LinkBookTarget target) {
+        Vec3 sourceLook = normal.getOpposite().getUnitVec3();
+        Vec3 sourceUp = normal.getAxis() == Direction.Axis.Y ? new Vec3(0, 0, -1) : new Vec3(0, 1, 0);
+        Vec3 destinationLook = Vec3.directionFromRotation(target.pitch(), target.yaw());
+        Vec3 destinationUp = Vec3.directionFromRotation(target.pitch() - 90, target.yaw());
+        DQuaternion from = DQuaternion.fromFacingVecs(sourceLook.cross(sourceUp), sourceUp);
+        DQuaternion to = DQuaternion.fromFacingVecs(destinationLook.cross(destinationUp), destinationUp);
+        return to.hamiltonProduct(from.getConjugated()).getNormalized();
+    }
+    private static String ownerTag(BlockPos owner) { return PREFIX + owner.asLong() + ":"; }
+    private RebornCrystalView() {}
+}
@@ -0,0 +1,112 @@
+package net.dnorberg.rivencraft.compat;
+
+import java.util.IdentityHashMap;
+import java.util.Map;
+import java.util.UUID;
+import net.dnorberg.rivencraft.network.RequestBookPreviewPayload;
+import net.dnorberg.rivencraft.network.BookPreviewPayload;
+import net.dnorberg.rivencraft.network.PortBookNetworking;
+import net.dnorberg.rivencraft.Rivencraft;
+import net.dnorberg.rivencraft.age.AgeCatalogSync;
+import net.dnorberg.rivencraft.age.PortAgeTravel;
+import net.dnorberg.rivencraft.item.*;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.registries.Registries;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.level.ServerPlayer;
+import net.minecraft.world.InteractionHand;
+import net.minecraft.world.item.ItemStack;
+import net.neoforged.neoforge.network.PacketDistributor;
+import qouteall.imm_ptl.core.api.PortalAPI;
+import qouteall.imm_ptl.core.chunk_loading.ChunkLoader;
+import qouteall.imm_ptl.core.chunk_loading.ImmPtlChunkTracking;
+
+/** Optional API class: one expiring stream per player, validated before any chunk load. */
+final class RebornPreviewChunks {
+    private static final Map<ServerPlayer, Lease> LEASES = new IdentityHashMap<>();
+    private static final Map<ServerPlayer, Long> REQUESTS = new IdentityHashMap<>();
+    private static final int LIFETIME = 600;
+    private record Lease(UUID session, ChunkLoader loader, LinkBookTarget destination,
+                         RequestBookPreviewPayload source, long expires) {}
+
+    static void open(ServerPlayer player, RequestBookPreviewPayload request) {
+        long now = player.level().getServer().getTickCount();
+        if (now - REQUESTS.getOrDefault(player, -100L) < 10) return;
+        REQUESTS.put(player, now);
+        ItemStack book = validated(player, request);
+        if (book.isEmpty()) { close(player); return; }
+        Lease previous = LEASES.get(player);
+        if (previous != null && previous.session().equals(request.session())
+                && previous.source().offhand() == request.offhand()
+                && previous.source().fromStand() == request.fromStand()
+                && previous.source().sourceDimension().equals(request.sourceDimension())
+                && previous.source().standPos().equals(request.standPos())
+                && ItemStack.matches(previous.source().book(), request.book())) {
+            LEASES.put(player, new Lease(previous.session(), previous.loader(), previous.destination(), request, now + LIFETIME));
+            PacketDistributor.sendToPlayer(player, new BookPreviewPayload(request.session(), previous.destination()));
+            return;
+        }
+        close(player);
+        LinkBookTarget target = book.get(Rivencraft.LINK_BOOK_TARGET.get());
+        var properties = book.getOrDefault(Rivencraft.LINK_PROPERTIES.get(), LinkProperties.NONE);
+        var server = player.level().getServer();
+        if (book.is(Rivencraft.DESCRIPTIVE_BOOK.get())) {
+            var id = book.get(Rivencraft.AGE_BOOK_ID.get());
+            var level = id == null ? null : server.getLevel(ResourceKey.create(Registries.DIMENSION, id));
+            if (level == null || !AgeCatalogSync.ready(player, id)) return;
+            BlockPos landing = PortAgeTravel.resolveLanding(level, player, properties.forDescriptiveBook());
+            if (landing == null) return;
+            target = new LinkBookTarget(id, landing.getX() + 0.5, landing.getY(), landing.getZ() + 0.5,
+                    player.getYRot(), player.getXRot());
+        } else if (book.is(Rivencraft.LINKING_BOOK.get()) && target != null) {
+            var level = server.getLevel(ResourceKey.create(Registries.DIMENSION, target.dimension()));
+            if (level == null || !AgeCatalogSync.ready(player, target.dimension())) return;
+            target = PortLinkDestinations.resolve(player.level(), level, player.blockPosition(), target, properties);
+        } else return;
+        if (!target.valid()) return;
+        var level = server.getLevel(ResourceKey.create(Registries.DIMENSION, target.dimension()));
+        var center = BlockPos.containing(target.x(), target.y(), target.z());
+        if (level == null || !level.isInWorldBounds(center) || !level.getWorldBorder().isWithinBounds(center)) return;
+        close(player);
+        // Match the root live renderer's eight-chunk orbit view. Reborn schedules
+        // generation/streaming; no synchronous square of getChunk() calls here.
+        var loader = new ChunkLoader(level.dimension(), center.getX() >> 4, center.getZ() >> 4, 8);
+        PortalAPI.addChunkLoaderForPlayer(player, loader);
+        LEASES.put(player, new Lease(request.session(), loader, target, request, now + LIFETIME));
+        ImmPtlChunkTracking.immediatelyUpdateForPlayer(player);
+        PacketDistributor.sendToPlayer(player, new BookPreviewPayload(request.session(), target));
+    }
+
+    private static ItemStack validated(ServerPlayer player, RequestBookPreviewPayload request) {
+        if (!player.level().dimension().identifier().equals(request.sourceDimension()) || !player.isAlive()) return ItemStack.EMPTY;
+        if (request.fromStand()) return PortBookNetworking.validatedStandBook(player,
+                new net.dnorberg.rivencraft.network.UseBookStandPayload(request.sourceDimension(), request.standPos(), request.book()));
+        ItemStack held = player.getItemInHand(request.offhand() ? InteractionHand.OFF_HAND : InteractionHand.MAIN_HAND);
+        return ItemStack.matches(held, request.book()) ? held : ItemStack.EMPTY;
+    }
+
+    static void release(ServerPlayer player, UUID session) {
+        Lease lease = LEASES.get(player);
+        if (lease != null && lease.session().equals(session)) close(player);
+    }
+    static void close(ServerPlayer player) {
+        Lease lease = LEASES.remove(player);
+        if (lease != null) PortalAPI.removeChunkLoaderForPlayer(player, lease.loader());
+    }
+    static void tick(MinecraftServer server) {
+        if (server.getTickCount() % 20 != 0) return;
+        for (ServerPlayer player : java.util.List.copyOf(LEASES.keySet())) {
+            Lease lease = LEASES.get(player);
+            if (server.getTickCount() >= lease.expires()
+                    || server.getLevel(lease.loader().dimension()) == null
+                    || validated(player, lease.source()).isEmpty()) close(player);
+        }
+    }
+    static void logout(ServerPlayer player) { close(player); REQUESTS.remove(player); }
+    static void stop() {
+        for (ServerPlayer player : java.util.List.copyOf(LEASES.keySet())) close(player);
+        REQUESTS.clear();
+    }
+    private RebornPreviewChunks() {}
+}
@@ -0,0 +1,59 @@
+package net.dnorberg.rivencraft.mixin;
+
+import net.dnorberg.rivencraft.client.PortBookPreview;
+import net.minecraft.client.multiplayer.ClientLevel;
+import net.minecraft.core.Holder;
+import net.minecraft.sounds.SoundEvent;
+import net.minecraft.sounds.SoundSource;
+import net.minecraft.world.entity.Entity;
+import net.minecraft.world.entity.player.Player;
+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.CallbackInfo;
+
+/** Mutes only the remote client world displayed by a Rivencraft book preview. */
+@Mixin(value = ClientLevel.class, priority = 2000)
+public abstract class ClientLevelSoundMixin {
+    @Inject(
+            method = "playSound(DDDLnet/minecraft/sounds/SoundEvent;Lnet/minecraft/sounds/SoundSource;FFZJ)V",
+            at = @At("HEAD"),
+            cancellable = true
+    )
+    private void rivencraft$mutePreviewPositionSound(
+            double x, double y, double z, SoundEvent sound, SoundSource source,
+            float volume, float pitch, boolean distanceDelay, long seed, CallbackInfo callback
+    ) {
+        rivencraft$cancelPreviewSound(callback);
+    }
+
+    @Inject(
+            method = "playLocalSound(Lnet/minecraft/world/entity/Entity;Lnet/minecraft/sounds/SoundEvent;Lnet/minecraft/sounds/SoundSource;FF)V",
+            at = @At("HEAD"),
+            cancellable = true
+    )
+    private void rivencraft$mutePreviewLocalEntitySound(
+            Entity entity, SoundEvent sound, SoundSource source, float volume, float pitch,
+            CallbackInfo callback
+    ) {
+        rivencraft$cancelPreviewSound(callback);
+    }
+
+    @Inject(
+            method = "playSeededSound(Lnet/minecraft/world/entity/Entity;Lnet/minecraft/world/entity/Entity;Lnet/minecraft/core/Holder;Lnet/minecraft/sounds/SoundSource;FFJ)V",
+            at = @At("HEAD"),
+            cancellable = true
+    )
+    private void rivencraft$mutePreviewSeededEntitySound(
+            Entity player, Entity entity, Holder<SoundEvent> sound, SoundSource source,
+            float volume, float pitch, long seed, CallbackInfo callback
+    ) {
+        rivencraft$cancelPreviewSound(callback);
+    }
+
+    private void rivencraft$cancelPreviewSound(CallbackInfo callback) {
+        if (PortBookPreview.shouldMute((ClientLevel)(Object)this)) {
+            callback.cancel();
+        }
+    }
+}
@@ -0,0 +1,22 @@
+package net.dnorberg.rivencraft.mixin;
+
+import net.dnorberg.rivencraft.client.RebornLiveBookPanel;
+import net.dnorberg.rivencraft.compat.RebornBookPreviews;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Pseudo;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Pseudo
+@Mixin(targets = "qouteall.imm_ptl.core.render.GuiPortalRendering", remap = false)
+public abstract class RebornGuiRenderingMixin {
+    @Inject(method = "_onGameRenderEnd", at = @At("HEAD"), remap = false)
+    private static void rivencraft$clearLiveTarget(CallbackInfo ci) {
+        if (RebornBookPreviews.available()) RebornLiveBookPanel.beginRender();
+    }
+    @Inject(method = "_onGameRenderEnd", at = @At("RETURN"), remap = false)
+    private static void rivencraft$restoreCamera(CallbackInfo ci) {
+        if (RebornBookPreviews.available()) RebornLiveBookPanel.endRender();
+    }
+}
@@ -0,0 +1,17 @@
+package net.dnorberg.rivencraft.network;
+
+import java.util.UUID;
+import net.dnorberg.rivencraft.Rivencraft;
+import net.dnorberg.rivencraft.item.LinkBookTarget;
+import net.minecraft.network.RegistryFriendlyByteBuf;
+import net.minecraft.network.codec.StreamCodec;
+import net.minecraft.network.protocol.common.custom.CustomPacketPayload;
+import net.minecraft.resources.Identifier;
+
+public record BookPreviewPayload(UUID session, LinkBookTarget destination) implements CustomPacketPayload {
+    public static final Type<BookPreviewPayload> TYPE = new Type<>(Identifier.fromNamespaceAndPath(Rivencraft.MOD_ID, "book_preview"));
+    public static final StreamCodec<RegistryFriendlyByteBuf, BookPreviewPayload> STREAM_CODEC = StreamCodec.of(
+            (buf, value) -> { buf.writeUUID(value.session()); LinkBookTarget.STREAM_CODEC.encode(buf, value.destination()); },
+            buf -> new BookPreviewPayload(buf.readUUID(), LinkBookTarget.STREAM_CODEC.decode(buf)));
+    @Override public Type<BookPreviewPayload> type() { return TYPE; }
+}
@@ -33,6 +33,17 @@ public final class PortBookNetworking {

    public static void registerPayloads(RegisterPayloadHandlersEvent event) {
        var registrar = event.registrar("1");
+        registrar.playToClient(BookPreviewPayload.TYPE, BookPreviewPayload.STREAM_CODEC);
+        registrar.playToServer(RequestBookPreviewPayload.TYPE, RequestBookPreviewPayload.STREAM_CODEC,
+                (payload, context) -> {
+                    if (context.player() instanceof ServerPlayer player)
+                        net.dnorberg.rivencraft.compat.RebornBookPreviews.open(player, payload);
+                });
+        registrar.playToServer(ReleaseBookPreviewPayload.TYPE, ReleaseBookPreviewPayload.STREAM_CODEC,
+                (payload, context) -> {
+                    if (context.player() instanceof ServerPlayer player)
+                        net.dnorberg.rivencraft.compat.RebornBookPreviews.release(player, payload.session());
+                });
        registrar.playToServer(SetLinkModifierSeedPayload.TYPE, SetLinkModifierSeedPayload.STREAM_CODEC,
                (payload, context) -> {
                    if (context.player() instanceof ServerPlayer player
@@ -130,6 +141,8 @@ 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();
+        var policy = pages.isEmpty() ? net.dnorberg.rivencraft.age.PortRandomPagePolicy.configured()
+                : net.dnorberg.rivencraft.age.PortRandomPagePolicy.UNRESTRICTED;
        var recovery = net.dnorberg.rivencraft.writing.PortWritingRecovery.recover(pages);
        List<Identifier> activePages = recovery.activePages();
        net.dnorberg.rivencraft.age.PortBiomePlan biomePlan;
@@ -137,7 +150,7 @@ public final class PortBookNetworking {
        List<Identifier> generationPages;
        try {
            if (pages.isEmpty()) {
-                var random = PortRandomAgeSelection.select(player.level().getServer(), seed);
+                var random = PortRandomAgeSelection.select(player.level().getServer(), seed, policy);
                terrain = random.terrain();
                biomePlan = random.biomes();
                generationPages = pages;
@@ -163,9 +176,9 @@ public final class PortBookNetworking {
            id = Identifier.fromNamespaceAndPath(Rivencraft.MOD_ID, "age/" + name);
        }
        try {
-            var environment = net.dnorberg.rivencraft.age.PortEnvironmentSelection.resolve(activePages, seed, terrain);
+            var environment = net.dnorberg.rivencraft.age.PortEnvironmentSelection.resolve(activePages, seed, terrain, policy);
            var randomFeatures = pages.isEmpty()
-                    ? net.dnorberg.rivencraft.age.PortRandomFeatureSelection.select(server, seed, terrain, biomePlan) : null;
+                    ? net.dnorberg.rivencraft.age.PortRandomFeatureSelection.select(server, seed, terrain, biomePlan, policy) : null;
            RuntimeAgeBackend.create(server, id, seed, biomePlan, terrain,
                    randomFeatures == null ? PortAuthoredWriting.rockPlan(generationPages, seed) : randomFeatures.rocks(),
                    PortAuthoredWriting.vegetationPlan(generationPages),
@@ -175,7 +188,7 @@ public final class PortBookNetworking {
                    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())), pages, title);
+                            net.dnorberg.rivencraft.age.PortDayCycle.nativeTicks(server.overworld()), policy), pages, title, policy);
        } catch (RuntimeException exception) {
            Rivencraft.LOGGER.warn("Age creation failed for {}", id, exception);
            player.sendOverlayMessage(Component.literal("Age creation failed: "
@@ -0,0 +1,15 @@
+package net.dnorberg.rivencraft.network;
+
+import java.util.UUID;
+import net.dnorberg.rivencraft.Rivencraft;
+import net.minecraft.network.RegistryFriendlyByteBuf;
+import net.minecraft.network.codec.StreamCodec;
+import net.minecraft.network.protocol.common.custom.CustomPacketPayload;
+import net.minecraft.resources.Identifier;
+
+public record ReleaseBookPreviewPayload(UUID session) implements CustomPacketPayload {
+    public static final Type<ReleaseBookPreviewPayload> TYPE = new Type<>(Identifier.fromNamespaceAndPath(Rivencraft.MOD_ID, "release_book_preview"));
+    public static final StreamCodec<RegistryFriendlyByteBuf, ReleaseBookPreviewPayload> STREAM_CODEC = StreamCodec.of(
+            (buf, value) -> buf.writeUUID(value.session()), buf -> new ReleaseBookPreviewPayload(buf.readUUID()));
+    @Override public Type<ReleaseBookPreviewPayload> type() { return TYPE; }
+}
@@ -0,0 +1,24 @@
+package net.dnorberg.rivencraft.network;
+
+import java.util.UUID;
+import net.dnorberg.rivencraft.Rivencraft;
+import net.minecraft.core.BlockPos;
+import net.minecraft.network.RegistryFriendlyByteBuf;
+import net.minecraft.network.codec.StreamCodec;
+import net.minecraft.network.protocol.common.custom.CustomPacketPayload;
+import net.minecraft.resources.Identifier;
+import net.minecraft.world.item.ItemStack;
+
+/** The server verifies the actual held/stand book, never a client-supplied destination. */
+public record RequestBookPreviewPayload(UUID session, boolean offhand, boolean fromStand,
+        Identifier sourceDimension, BlockPos standPos, ItemStack book) implements CustomPacketPayload {
+    public static final Type<RequestBookPreviewPayload> TYPE = new Type<>(Identifier.fromNamespaceAndPath(Rivencraft.MOD_ID, "request_book_preview"));
+    public static final StreamCodec<RegistryFriendlyByteBuf, RequestBookPreviewPayload> STREAM_CODEC = StreamCodec.of(
+            (buf, value) -> {
+                buf.writeUUID(value.session()); buf.writeBoolean(value.offhand()); buf.writeBoolean(value.fromStand());
+                Identifier.STREAM_CODEC.encode(buf, value.sourceDimension());
+                BlockPos.STREAM_CODEC.encode(buf, value.standPos()); ItemStack.STREAM_CODEC.encode(buf, value.book());
+            }, buf -> new RequestBookPreviewPayload(buf.readUUID(), buf.readBoolean(), buf.readBoolean(),
+                    Identifier.STREAM_CODEC.decode(buf), BlockPos.STREAM_CODEC.decode(buf), ItemStack.STREAM_CODEC.decode(buf)));
+    @Override public Type<RequestBookPreviewPayload> type() { return TYPE; }
+}
@@ -176,10 +176,12 @@ public final class CrystalPortalNetwork {
                return false;
            }
        }
+        net.dnorberg.rivencraft.compat.RebornCrystalPortals.refresh(level, receptacle, plan, holder.getBook());
        return true;
    }

    public static void shutdown(ServerLevel level, BlockPos receptacle) {
+        net.dnorberg.rivencraft.compat.RebornCrystalPortals.remove(level, receptacle);
        // A broken support can disconnect the graph. Scan a bounded volume rather
        // than trusting a path through blocks that no longer exist.
        for (BlockPos pos : BlockPos.betweenClosed(receptacle.offset(-CLEANUP_RADIUS, -CLEANUP_RADIUS, -CLEANUP_RADIUS),
@@ -221,6 +223,8 @@ public final class CrystalPortalNetwork {
                level.setBlock(pos, Blocks.AIR.defaultBlockState(), 3);
        }
        orientSurfaces(level, plan);
+        var holder = (BookReceptacleBlockEntity) level.getBlockEntity(receptacle);
+        net.dnorberg.rivencraft.compat.RebornCrystalPortals.refresh(level, receptacle, plan, holder.getBook());
        return true;
    }

@@ -24,6 +24,26 @@ public final class PortalBookTravel {
                : book.has(Rivencraft.LINK_BOOK_TARGET.get()) ? book.get(Rivencraft.LINK_BOOK_TARGET.get()).dimension() : null;
        return id != null && source.getServer().getLevel(ResourceKey.create(Registries.DIMENSION, id)) != null;
    }
+    /** The same destination rules serve native rendering and actual portal arrivals. */
+    public static LinkBookTarget destination(ServerLevel source, ItemStack book,
+                                             net.minecraft.core.BlockPos departure, float yaw, float pitch) {
+        var properties = book.getOrDefault(Rivencraft.LINK_PROPERTIES.get(), LinkProperties.NONE);
+        if (book.is(Rivencraft.DESCRIPTIVE_BOOK.get())) {
+            var id = book.get(Rivencraft.AGE_BOOK_ID.get());
+            var level = id == null ? null : source.getServer().getLevel(ResourceKey.create(Registries.DIMENSION, id));
+            if (level == null) return null;
+            var landing = PortAgeTravel.resolveLanding(level, source, departure, properties.forDescriptiveBook());
+            return landing == null ? null : new LinkBookTarget(id, landing.getX() + 0.5, landing.getY(),
+                    landing.getZ() + 0.5, yaw, pitch);
+        }
+        if (!book.is(Rivencraft.LINKING_BOOK.get())) return null;
+        var target = book.get(Rivencraft.LINK_BOOK_TARGET.get());
+        if (target == null || !target.valid()) return null;
+        var level = source.getServer().getLevel(ResourceKey.create(Registries.DIMENSION, target.dimension()));
+        return level == null ? null : net.dnorberg.rivencraft.item.PortLinkDestinations.resolve(
+                source, level, departure, target, properties);
+    }
+
    public static void travel(Entity entity, ServerLevel source, ItemStack book) {
        if (entity instanceof ServerPlayer player) {
            if (book.is(Rivencraft.DESCRIPTIVE_BOOK.get())) {
@@ -38,22 +58,10 @@ public final class PortalBookTravel {
        LinkProperties properties = book.getOrDefault(Rivencraft.LINK_PROPERTIES.get(), LinkProperties.NONE);
        if (properties.has(LinkProperties.DISARM) && !LinkDisarmService.mayTravel(entity)) return;
        boolean descriptive = book.is(Rivencraft.DESCRIPTIVE_BOOK.get());
-        LinkBookTarget destination = book.get(Rivencraft.LINK_BOOK_TARGET.get());
-        if (descriptive) {
-            var id = book.get(Rivencraft.AGE_BOOK_ID.get());
-            ServerLevel level = id == null ? null : source.getServer().getLevel(ResourceKey.create(Registries.DIMENSION, id));
-            if (level == null) return;
-            var landing = PortAgeTravel.resolveLanding(level, entity, properties.forDescriptiveBook());
-            if (landing == null) return;
-            destination = new LinkBookTarget(id, landing.getX() + 0.5, landing.getY(), landing.getZ() + 0.5,
-                    entity.getYRot(), entity.getXRot());
-        }
+        LinkBookTarget destination = destination(source, book, entity.blockPosition(), entity.getYRot(), entity.getXRot());
        if (destination == null || !destination.valid()) return;
        ServerLevel target = source.getServer().getLevel(ResourceKey.create(Registries.DIMENSION, destination.dimension()));
        if (target == null || !entity.canTeleport(source, target) || !descriptive && !properties.allowsTravel(target == source)) return;
-        if (!descriptive) destination = net.dnorberg.rivencraft.item.PortLinkDestinations.resolve(source, target,
-                entity.blockPosition(), destination, properties);
-        if (!destination.valid()) return;
        var feet = net.minecraft.core.BlockPos.containing(destination.x(), destination.y(), destination.z());
        if (feet.getY() < target.getMinY() || entity.getBbHeight() + feet.getY() >= target.getMaxY()
                || !target.getWorldBorder().isWithinBounds(feet)) return;
@@ -0,0 +1,40 @@
+package net.dnorberg.rivencraft.writing;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.regex.Pattern;
+
+/** Legacy prose word splitting and base-25 width, independent of the client renderer. */
+public final class PortGlyphTextLayout {
+    private static final Pattern WORD_BREAK = Pattern.compile("[^\\p{L}\\p{N}]+");
+    private static final Pattern NUMERAL = Pattern.compile("[0-9]+");
+    public record Glyph(String word, int x, int y, int width) {}
+    public record Layout(List<Glyph> glyphs, int height) {
+        public Layout { glyphs = List.copyOf(glyphs); }
+    }
+    private PortGlyphTextLayout() {}
+
+    public static int number(String word) {
+        if (!NUMERAL.matcher(word).matches()) return -1;
+        try { return Integer.parseInt(word); }
+        catch (NumberFormatException exception) { return -1; }
+    }
+
+    public static Layout layout(String text, int maxWidth, int size) {
+        if (size < 1 || maxWidth < size) throw new IllegalArgumentException("Invalid glyph text dimensions");
+        var glyphs = new ArrayList<Glyph>();
+        int x = 0, y = 0;
+        for (String word : WORD_BREAK.split(text)) {
+            if (word.isEmpty()) continue;
+            int value = number(word), width = size;
+            if (value >= 0) {
+                int digits = PortSymbolNumerals.digitsFor(value).length;
+                if (digits > 1) width = digits * (Math.max(8, size * 3 / 4) + 1) - 1;
+            }
+            if (x != 0 && x + width > maxWidth) { x = 0; y += size + 1; }
+            glyphs.add(new Glyph(word, x, y, width));
+            x += width + 3;
+        }
+        return new Layout(glyphs, glyphs.isEmpty() ? 0 : y + size + 1);
+    }
+}
@@ -55,6 +55,18 @@ public final class PortSymbolPages {
                .map(Entry::id).sorted().toList();
    }

+    /** Library loot includes exact Ruins templates; Sealed Notebooks keep their own pool. */
+    public static List<Identifier> libraryCandidateIds() {
+        return java.util.stream.Stream.concat(ENTRIES.values().stream()
+                        .filter(entry -> entry.id().getNamespace().equals(Rivencraft.MOD_ID)
+                                && !entry.id().getPath().startsWith("block/")
+                                && !entry.id().getPath().startsWith("biome/")
+                                && !entry.role().equals("unknown")).map(Entry::id),
+                net.dnorberg.rivencraft.compat.RuinsTemplatePages.templates().stream()
+                        .map(net.dnorberg.rivencraft.compat.RuinsTemplatePages::symbolId))
+                .distinct().sorted().toList();
+    }
+
    public static List<ItemStack> pages(String category, HolderLookup.Provider registries) {
        List<ItemStack> pages = new ArrayList<>();
        ENTRIES.values().stream().filter(entry -> entry.category().equals(category))
@@ -16,7 +16,9 @@
  ],
  "client": [
    "StaticSkyStateMixin",
-    "StaticSkyRendererMixin"
+    "StaticSkyRendererMixin",
+    "RebornGuiRenderingMixin",
+    "ClientLevelSoundMixin"
  ],
  "injectors": {
    "defaultRequire": 1