Add Legacy missing items and OP Link Modifier (#90)

docs/MILESTONE_7_COMPATIBILITY_REVIEW.md

@@ -31,7 +31,7 @@ release V0.6.6.0.
 | Ponder (bundled with Create) | 1.0.82 | 1.0.87 library artifact | [Maven](https://maven.createmod.net/net/createmod/ponder/ponder-neoforge/maven-metadata.xml) has a newer artifact, but Create 6.0.10 still bundles 1.0.82. Do not treat this as a separately installed Create update. |
 | Immersive Portals (optional) | 6.0.7 | 6.0.7 | No newer matching [Modrinth](https://modrinth.com/mod/immersive-portals-neoforge/versions) release found. |
 | TerraBlender (optional) | 4.1.0.8 | 4.1.0.8 | No newer matching [Modrinth](https://modrinth.com/mod/terrablender/versions) release found. |
-| Serene Seasons (optional) | 10.1.0.8 compile target | 10.1.0.9 | Separate update issue; the user's Prism instance already contains 10.1.0.9, but that is not a recorded compatibility pass. |
+| Serene Seasons (optional) | 10.1.0.8 at #82 review | 10.1.0.9 | Updated in #88 after the player's full seasonal matrix passed; see [Serene review](MILESTONE_7_SERENE_REVIEW.md). |
 | GlitchCore (Serene dependency) | 2.1.0.2 | 2.1.0.2 | No newer matching [Modrinth](https://modrinth.com/mod/glitchcore/versions) release found. |
 | Biomes O' Plenty (TerraBlender test addon) | 21.1.0.14 in user's Prism instance | 21.1.0.14 | No newer matching [Modrinth](https://modrinth.com/mod/biomes-o-plenty/versions) release found. |
 

docs/MILESTONE_7_SERENE_REVIEW.md

@@ -0,0 +1,31 @@
+# Serene Seasons 10.1.0.9 compatibility review (#88)
+
+Reviewed 2026-10-20 for Minecraft 1.21.1 and NeoForge 21.1.264. Rivencraft
+now compiles against [Serene Seasons 10.1.0.9](https://modrinth.com/mod/serene-seasons/version/pHEgQQUE)
+with [GlitchCore 2.1.0.2](https://modrinth.com/mod/glitchcore/version/S2TfWrZR).
+Both remain optional. The Serene update fixes a precipitation-mixin recursion;
+it does not introduce a new dynamic-dimension API.
+
+The 10.1.0.8 and 10.1.0.9 bytecode for Rivencraft's version-sensitive
+`SeasonsConfig`, `SeasonHandler`, `SeasonSavedData`, and `SeasonTime` integration
+classes is identical. In particular, the dimension whitelist field, per-level
+saved season clock, and season update method have unchanged signatures and
+implementations. The adapter still writes the whitelist through GlitchCore's
+config API and sends Rivencraft's whitelist update to already connected clients.
+
+Verification:
+
+| Check | Result |
+| --- | --- |
+| Build against 10.1.0.9 and GlitchCore 2.1.0.2 | Passed. |
+| Real Prism client with Serene 10.1.0.9, GlitchCore 2.1.0.2, and Rivencraft 0.6.6.7 | Both mods loaded and the player joined an Age. |
+| No Seasons, normal Seasons, and all four Eternal modes in new and saved Ages | Player reported the full in-game matrix passed. |
+| Reconnect, restart, and Overworld independence | Player reported the full in-game matrix passed. |
+| Isolated dedicated-server startup without Serene/GlitchCore | Reached `Done` on port 25568 with only required runtime mods, then saved and stopped. |
+| Isolated dedicated-server startup with Serene/GlitchCore | Reached `Done` on port 25569 with 10.1.0.9/2.1.0.2, then saved and stopped. |
+
+Serene's sync packet is incompatible with GameTest mock players, so its
+in-game behavior must be checked with a real client and server. The seasonal
+test path in [SERENE_SEASONS_COMPATIBILITY.md](SERENE_SEASONS_COMPATIBILITY.md)
+remains the regression checklist for future upgrades. Rivencraft does not
+bundle or require Serene Seasons or GlitchCore.

gradle.properties

@@ -36,10 +36,10 @@ mod_name=Rivencraft
 # The license of the mod. Review your options at https://choosealicense.com/. All Rights Reserved is the default.
 mod_license=LGPL-3.0-or-later
 # The mod version. Rivencraft uses the x.y.z.b policy documented in README.md.
-mod_version=0.6.6.7
+mod_version=0.6.6.9
 immersive_portals_version=6.0.7
 terrablender_version=4.1.0.8
-serene_seasons_version_id=B6nTjh4b
+serene_seasons_version_id=pHEgQQUE
 glitchcore_version_id=S2TfWrZR
 # The group ID for the mod. It is only important when publishing as an artifact to a Maven repository.
 # This should match the base package used for the mod sources.

src/main/java/net/dnorberg/rivencraft/block/LinkModifierBlock.java

@@ -0,0 +1,63 @@
+package net.dnorberg.rivencraft.block;
+
+import com.mojang.serialization.MapCodec;
+import net.dnorberg.rivencraft.block.entity.LinkModifierBlockEntity;
+import net.dnorberg.rivencraft.menu.LinkModifierMenu;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.Direction;
+import net.minecraft.network.chat.Component;
+import net.minecraft.server.level.ServerPlayer;
+import net.minecraft.world.Containers;
+import net.minecraft.world.InteractionResult;
+import net.minecraft.world.SimpleMenuProvider;
+import net.minecraft.world.entity.player.Player;
+import net.minecraft.world.item.context.BlockPlaceContext;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.block.BaseEntityBlock;
+import net.minecraft.world.level.block.RenderShape;
+import net.minecraft.world.level.block.entity.BlockEntity;
+import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.level.block.state.StateDefinition;
+import net.minecraft.world.level.block.state.properties.BlockStateProperties;
+import net.minecraft.world.level.block.state.properties.DirectionProperty;
+import net.minecraft.world.phys.BlockHitResult;
+
+public final class LinkModifierBlock extends BaseEntityBlock {
+    public static final MapCodec<LinkModifierBlock> CODEC = simpleCodec(LinkModifierBlock::new);
+    public static final DirectionProperty FACING = BlockStateProperties.HORIZONTAL_FACING;
+
+    public LinkModifierBlock(Properties properties) {
+        super(properties);
+        registerDefaultState(stateDefinition.any().setValue(FACING, Direction.NORTH));
+    }
+
+    @Override protected MapCodec<? extends BaseEntityBlock> codec() { return CODEC; }
+    @Override protected void createBlockStateDefinition(StateDefinition.Builder<net.minecraft.world.level.block.Block,
+            BlockState> builder) { builder.add(FACING); }
+    @Override public BlockState getStateForPlacement(BlockPlaceContext context) {
+        return defaultBlockState().setValue(FACING, context.getHorizontalDirection().getOpposite());
+    }
+    @Override protected RenderShape getRenderShape(BlockState state) { return RenderShape.MODEL; }
+    @Override public BlockEntity newBlockEntity(BlockPos pos, BlockState state) {
+        return new LinkModifierBlockEntity(pos, state);
+    }
+    @Override protected InteractionResult useWithoutItem(BlockState state, Level level, BlockPos pos,
+                                                          Player player, BlockHitResult hit) {
+        if (!level.isClientSide && player instanceof ServerPlayer serverPlayer
+                && level.getBlockEntity(pos) instanceof LinkModifierBlockEntity modifier) {
+            serverPlayer.openMenu(new SimpleMenuProvider(
+                    (id, inventory, ignored) -> new LinkModifierMenu(id, inventory, modifier),
+                    Component.translatable("container.rivencraft.link_modifier")),
+                    buffer -> buffer.writeBlockPos(pos));
+        }
+        return InteractionResult.sidedSuccess(level.isClientSide);
+    }
+    @Override protected void onRemove(BlockState state, Level level, BlockPos pos,
+                                      BlockState replacement, boolean moving) {
+        if (!state.is(replacement.getBlock()) && !level.isClientSide
+                && level.getBlockEntity(pos) instanceof LinkModifierBlockEntity modifier) {
+            Containers.dropContents(level, pos, modifier);
+        }
+        super.onRemove(state, level, pos, replacement, moving);
+    }
+}

src/main/java/net/dnorberg/rivencraft/block/entity/BookBinderBlockEntity.java

@@ -12,6 +12,7 @@ import net.dnorberg.rivencraft.registry.ModBlockEntities;
 import net.dnorberg.rivencraft.registry.ModDataComponents;
 import net.dnorberg.rivencraft.registry.ModItems;
 import net.dnorberg.rivencraft.writing.NotebookContents;
+import net.dnorberg.rivencraft.item.CollationFolderItem;
 import net.dnorberg.rivencraft.writing.OrderedWriting;
 import net.dnorberg.rivencraft.writing.PageContent;
 import net.dnorberg.rivencraft.writing.WritingGrammar;
@@ -96,7 +97,7 @@ public final class BookBinderBlockEntity extends BlockEntity implements Containe
             case COVER -> validCover(stack);
             case LINK_PANEL -> stack.is(ModItems.PAGE.get())
                     && PageItem.content(stack).kind() == PageContent.Kind.LINK_PANEL;
-            case NOTEBOOK -> stack.is(ModItems.NOTEBOOK.get());
+            case NOTEBOOK -> CollationFolderItem.isCollection(stack);
             default -> slot >= FIRST_PAGE && slot < SIZE && validPage(stack);
         };
     }
@@ -296,7 +297,7 @@ public final class BookBinderBlockEntity extends BlockEntity implements Containe
 
     /** Import a Notebook from either its stored slot or the player's cursor. */
     public ItemStack importNotebookFromStack(ItemStack notebook, int index) {
-        if (!notebook.is(ModItems.NOTEBOOK.get()) || notebook.getCount() != 1) return ItemStack.EMPTY;
+        if (!CollationFolderItem.isCollection(notebook) || notebook.getCount() != 1) return ItemStack.EMPTY;
         List<ItemStack> pages = notebook.getOrDefault(ModDataComponents.NOTEBOOK_CONTENTS.get(), NotebookContents.EMPTY).pages();
         if (pages.isEmpty()) return ItemStack.EMPTY;
         int end = nextPageIndex();

src/main/java/net/dnorberg/rivencraft/block/entity/LinkModifierBlockEntity.java

@@ -0,0 +1,63 @@
+package net.dnorberg.rivencraft.block.entity;
+
+import net.dnorberg.rivencraft.registry.ModBlockEntities;
+import net.dnorberg.rivencraft.registry.ModItems;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.HolderLookup;
+import net.minecraft.core.NonNullList;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.world.Container;
+import net.minecraft.world.ContainerHelper;
+import net.minecraft.world.entity.player.Player;
+import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.level.block.entity.BlockEntity;
+import net.minecraft.world.level.block.state.BlockState;
+
+/** One persisted book slot; edits are performed by the server menu. */
+public final class LinkModifierBlockEntity extends BlockEntity implements Container {
+    private NonNullList<ItemStack> items = NonNullList.withSize(1, ItemStack.EMPTY);
+
+    public LinkModifierBlockEntity(BlockPos pos, BlockState state) {
+        super(ModBlockEntities.LINK_MODIFIER.get(), pos, state);
+    }
+
+    @Override public int getContainerSize() { return 1; }
+    @Override public boolean isEmpty() { return items.getFirst().isEmpty(); }
+    @Override public ItemStack getItem(int slot) { return items.get(slot); }
+    @Override public ItemStack removeItem(int slot, int amount) {
+        ItemStack removed = ContainerHelper.removeItem(items, slot, amount);
+        if (!removed.isEmpty()) setChanged();
+        return removed;
+    }
+    @Override public ItemStack removeItemNoUpdate(int slot) {
+        ItemStack removed = ContainerHelper.takeItem(items, slot);
+        if (!removed.isEmpty()) setChanged();
+        return removed;
+    }
+    @Override public void setItem(int slot, ItemStack stack) {
+        items.set(slot, stack.copyWithCount(Math.min(1, stack.getCount())));
+        setChanged();
+    }
+    @Override public boolean canPlaceItem(int slot, ItemStack stack) {
+        return slot == 0 && (stack.is(ModItems.LINKING_BOOK.get())
+                || stack.is(ModItems.DESCRIPTIVE_BOOK.get()));
+    }
+    @Override public boolean stillValid(Player player) {
+        return level != null && level.isLoaded(worldPosition) && level.getBlockEntity(worldPosition) == this
+                && player.distanceToSqr(worldPosition.getX() + 0.5, worldPosition.getY() + 0.5,
+                        worldPosition.getZ() + 0.5) <= 64.0;
+    }
+    @Override public void clearContent() {
+        items = NonNullList.withSize(1, ItemStack.EMPTY);
+        setChanged();
+    }
+    @Override protected void loadAdditional(CompoundTag tag, HolderLookup.Provider registries) {
+        super.loadAdditional(tag, registries);
+        items = NonNullList.withSize(1, ItemStack.EMPTY);
+        ContainerHelper.loadAllItems(tag, items, registries);
+    }
+    @Override protected void saveAdditional(CompoundTag tag, HolderLookup.Provider registries) {
+        super.saveAdditional(tag, registries);
+        ContainerHelper.saveAllItems(tag, items, registries);
+    }
+}

src/main/java/net/dnorberg/rivencraft/block/entity/WritingDeskBlockEntity.java

@@ -2,6 +2,7 @@ package net.dnorberg.rivencraft.block.entity;
 
 import net.dnorberg.rivencraft.item.InkVialItem;
 import net.dnorberg.rivencraft.item.PageItem;
+import net.dnorberg.rivencraft.item.CollationFolderItem;
 import net.dnorberg.rivencraft.writing.InkVialExchange;
 import net.dnorberg.rivencraft.writing.WritingInkService;
 import net.dnorberg.rivencraft.writing.PageContent;
@@ -87,7 +88,7 @@ public final class WritingDeskBlockEntity extends BlockEntity implements Contain
                         worldPosition.getZ() + 0.5) <= 64.0;
     }
     @Override public boolean canPlaceItem(int slot, ItemStack stack) {
-        if (slot < COLLECTIONS) return stack.is(ModItems.NOTEBOOK.get())
+        if (slot < COLLECTIONS) return CollationFolderItem.isCollection(stack)
                 && stack.getOrDefault(ModDataComponents.NOTEBOOK_CONTENTS.get(), NotebookContents.EMPTY)
                         .pages().stream().noneMatch(page -> PageItem.content(page).kind() == PageContent.Kind.LINK_PANEL)
                 || stack.is(ModItems.PAGE.get())

src/main/java/net/dnorberg/rivencraft/book/AgeDeletionService.java

@@ -0,0 +1,56 @@
+package net.dnorberg.rivencraft.book;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.LinkOption;
+import java.nio.file.Path;
+import java.nio.file.StandardCopyOption;
+import java.nio.file.AtomicMoveNotSupportedException;
+import net.dnorberg.rivencraft.Rivencraft;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.world.level.storage.LevelResource;
+
+/** Retires an exact Age and moves its unloaded region data out of the live world. */
+public final class AgeDeletionService {
+    public enum Result { RETIRED, ALREADY_DEAD, OCCUPIED, UNLOAD_FAILED, STORAGE_FAILED }
+
+    private AgeDeletionService() { }
+
+    public static Result retire(MinecraftServer server, AgeDefinition age) {
+        AgeRegistrySavedData registry = AgeRegistrySavedData.get(server.overworld());
+        if (registry.isDead(age.id())) return Result.ALREADY_DEAD;
+        var level = server.getLevel(AgeDimensionService.dimensionKey(age));
+        if (level != null && !level.players().isEmpty()) return Result.OCCUPIED;
+        if (AgeDimensionService.unload(server, age) == AgeDimensionService.UnloadResult.FAILED)
+            return Result.UNLOAD_FAILED;
+
+        Path world = server.getWorldPath(LevelResource.ROOT).toAbsolutePath().normalize();
+        Path ageRoot = world.resolve("dimensions/rivencraft/age").normalize();
+        Path data = world.resolve("dimensions")
+                .resolve(age.dimensionId().getNamespace())
+                .resolve(age.dimensionId().getPath()).normalize();
+        // Exact Rivencraft Age only; never move the shared age/ directory.
+        if (!data.startsWith(ageRoot) || data.equals(ageRoot)
+                || !"rivencraft".equals(age.dimensionId().getNamespace())
+                || !age.dimensionId().getPath().startsWith("age/")) return Result.STORAGE_FAILED;
+        try {
+            if (Files.isSymbolicLink(world.resolve("dimensions"))
+                    || Files.isSymbolicLink(world.resolve("dimensions/rivencraft"))
+                    || Files.isSymbolicLink(ageRoot) || Files.isSymbolicLink(data)) return Result.STORAGE_FAILED;
+            if (Files.exists(data, LinkOption.NOFOLLOW_LINKS)) {
+                Path archive = world.getParent().resolve(world.getFileName() + "-retired-ages")
+                        .resolve(age.id().toString());
+                if (Files.exists(archive, LinkOption.NOFOLLOW_LINKS)) return Result.STORAGE_FAILED;
+                Files.createDirectories(archive.getParent());
+                try { Files.move(data, archive, StandardCopyOption.ATOMIC_MOVE); }
+                catch (AtomicMoveNotSupportedException exception) { Files.move(data, archive); }
+                Rivencraft.LOGGER.warn("Retired Age {} data moved from {} to {}", age.id(), data, archive);
+            }
+        } catch (IOException exception) {
+            Rivencraft.LOGGER.error("Cannot archive data for Age {}", age.id(), exception);
+            return Result.STORAGE_FAILED;
+        }
+        registry.markDead(age.id());
+        return Result.RETIRED;
+    }
+}

src/main/java/net/dnorberg/rivencraft/book/AgeDimensionService.java

@@ -74,6 +74,7 @@ public final class AgeDimensionService {
         DynamicDimensionLoadCallback.register((server, loader) -> {
             ServerLevel overworld = server.overworld();
             for (AgeDefinition age : AgeRegistrySavedData.get(overworld).definitions()) {
+                if (AgeRegistrySavedData.get(overworld).isDead(age.id())) continue;
                 if (!canLoadProfile(server, age)) continue;
                 ServerLevel level = loader.loadDynamicDimension(
                         age.dimensionId(),
@@ -96,6 +97,7 @@ public final class AgeDimensionService {
     public static Optional<LinkTarget> resolve(ServerPlayer player, AgeReference reference,
                                                 OrderedWriting writing) {
         AgeDefinition definition = AgeRegistrySavedData.resolveOrCreate(player.serverLevel(), reference, writing);
+        if (AgeRegistrySavedData.get(player.serverLevel()).isDead(definition.id())) return Optional.empty();
         ServerLevel level = ensureLoaded(player.getServer(), definition);
         if (level == null) {
             return Optional.empty();
@@ -122,6 +124,7 @@ public final class AgeDimensionService {
     }
 
     public static ServerLevel ensureLoaded(MinecraftServer server, AgeDefinition definition) {
+        if (AgeRegistrySavedData.get(server.overworld()).isDead(definition.id())) return null;
         ResourceKey<Level> key = dimensionKey(definition);
         ServerLevel existing = server.getLevel(key);
         if (existing != null) {

src/main/java/net/dnorberg/rivencraft/book/AgePersistenceGameTests.java

@@ -23,6 +23,24 @@ public final class AgePersistenceGameTests {
     private AgePersistenceGameTests() {
     }
 
+    @GameTest(template = "empty")
+    public static void retiredAgeIdentitySurvivesSaveAndCannotLoad(GameTestHelper helper) {
+        UUID id = UUID.randomUUID();
+        AgeReference reference = new AgeReference(id, "Retired " + id);
+        AgeDefinition age = AgeRegistrySavedData.resolveOrCreate(helper.getLevel(), reference);
+        AgeRegistrySavedData registry = AgeRegistrySavedData.get(helper.getLevel());
+        helper.assertTrue(registry.markDead(id), "The first retirement must set the tombstone");
+        helper.assertTrue(!registry.markDead(id), "Retirement must be idempotent");
+        helper.assertTrue(AgeDimensionService.ensureLoaded(helper.getLevel().getServer(), age) == null,
+                "A retired Age must never load from an old book");
+        AgeRegistrySavedData restored = AgeRegistrySavedData.load(
+                registry.save(new CompoundTag(), helper.getLevel().registryAccess()),
+                helper.getLevel().registryAccess());
+        helper.assertTrue(restored.isDead(id) && restored.find(id).isPresent(),
+                "Both the retired flag and reserved Age identity must survive reload");
+        helper.succeed();
+    }
+
     @GameTest(template = "empty")
     public static void authoredPlanRetainsResolvedMeaningAndAgeIdentity(GameTestHelper helper) {
         OrderedWriting writing = new OrderedWriting(List.of(

src/main/java/net/dnorberg/rivencraft/book/AgeRegistrySavedData.java

@@ -5,6 +5,9 @@ import java.util.Map;
 import java.util.Optional;
 import java.util.UUID;
 import java.util.List;
+import java.util.HashSet;
+import java.util.Set;
+import net.minecraft.nbt.StringTag;
 import net.dnorberg.rivencraft.writing.OrderedWriting;
 import net.minecraft.core.BlockPos;
 import net.minecraft.core.HolderLookup;
@@ -21,6 +24,7 @@ import net.neoforged.fml.ModList;
 public final class AgeRegistrySavedData extends SavedData {
     private static final String DATA_NAME = "rivencraft_ages";
     private static final String AGES_TAG = "Ages";
+    private static final String DEAD_AGES_TAG = "DeadAges";
     private static final String ID_TAG = "Id";
     private static final String NAME_TAG = "Name";
     private static final String SEED_TAG = "Seed";
@@ -50,6 +54,7 @@ public final class AgeRegistrySavedData extends SavedData {
     );
 
     private final Map<UUID, AgeDefinition> ages = new HashMap<>();
+    private final Set<UUID> deadAges = new HashSet<>();
 
     public static AgeRegistrySavedData get(ServerLevel level) {
         return level.getServer().overworld().getDataStorage().computeIfAbsent(FACTORY, DATA_NAME);
@@ -110,6 +115,16 @@ public final class AgeRegistrySavedData extends SavedData {
         return List.copyOf(ages.values());
     }
 
+    public boolean isDead(UUID ageId) { return deadAges.contains(ageId); }
+
+    /** Keep the ID and definition reserved so an old book cannot regenerate a retired Age. */
+    public boolean markDead(UUID ageId) {
+        if (!ages.containsKey(ageId)) return false;
+        boolean changed = deadAges.add(ageId);
+        if (changed) setDirty();
+        return changed;
+    }
+
     public AgeDefinition setSpawn(UUID ageId, BlockPos spawn) {
         AgeDefinition existing = ages.get(ageId);
         if (existing == null) {
@@ -161,6 +176,11 @@ public final class AgeRegistrySavedData extends SavedData {
 
     static AgeRegistrySavedData load(CompoundTag tag, HolderLookup.Provider registries) {
         AgeRegistrySavedData data = new AgeRegistrySavedData();
+        ListTag deadTags = tag.getList(DEAD_AGES_TAG, StringTag.TAG_STRING);
+        for (int index = 0; index < deadTags.size(); index++) {
+            try { data.deadAges.add(UUID.fromString(deadTags.getString(index))); }
+            catch (IllegalArgumentException ignored) { }
+        }
         ListTag serializedAges = tag.getList(AGES_TAG, CompoundTag.TAG_COMPOUND);
         for (int index = 0; index < serializedAges.size(); index++) {
             CompoundTag entry = serializedAges.getCompound(index);
@@ -264,6 +284,9 @@ public final class AgeRegistrySavedData extends SavedData {
                     serializedAges.add(entry);
                 });
         tag.put(AGES_TAG, serializedAges);
+        ListTag deadTags = new ListTag();
+        deadAges.stream().sorted().forEach(id -> deadTags.add(StringTag.valueOf(id.toString())));
+        tag.put(DEAD_AGES_TAG, deadTags);
         return tag;
     }
 

src/main/java/net/dnorberg/rivencraft/client/ClientEvents.java

@@ -26,6 +26,7 @@ import net.dnorberg.rivencraft.client.screen.NotebookScreen;
 import net.dnorberg.rivencraft.client.screen.WritingDeskScreen;
 import net.dnorberg.rivencraft.client.screen.BookBinderScreen;
 import net.dnorberg.rivencraft.client.screen.InkMixerScreen;
+import net.dnorberg.rivencraft.client.screen.LinkModifierScreen;
 import net.dnorberg.rivencraft.registry.ModMenus;
 
 @EventBusSubscriber(modid = Rivencraft.MOD_ID, value = Dist.CLIENT)
@@ -47,6 +48,7 @@ public final class ClientEvents {
         event.register(ModMenus.WRITING_DESK.get(), WritingDeskScreen::new);
         event.register(ModMenus.BOOK_BINDER.get(), BookBinderScreen::new);
         event.register(ModMenus.INK_MIXER.get(), InkMixerScreen::new);
+        event.register(ModMenus.LINK_MODIFIER.get(), LinkModifierScreen::new);
     }
 
     @SubscribeEvent

src/main/java/net/dnorberg/rivencraft/client/screen/DescriptiveBookScreen.java

@@ -27,6 +27,7 @@ import net.minecraft.client.gui.components.Button;
 import net.minecraft.client.gui.components.EditBox;
 import net.minecraft.client.gui.components.Tooltip;
 import net.minecraft.network.chat.Component;
+import net.minecraft.core.component.DataComponents;
 import net.minecraft.resources.ResourceLocation;
 import net.minecraft.sounds.SoundEvents;
 import net.minecraft.util.FormattedCharSequence;
@@ -48,6 +49,7 @@ public final class DescriptiveBookScreen extends Screen implements ExplorableBoo
     private static final Component EXPLORE_ICON = Component.literal("👁");
 
     private final AgeReference age;
+    private final Component displayName;
     private final ResourceLocation generationProfile;
     private final AgeTraits traits;
     private final OrderedWriting writing;
@@ -68,6 +70,7 @@ public final class DescriptiveBookScreen extends Screen implements ExplorableBoo
                                  List<SymbolDisplayMetadata> writingSymbols) {
         super(book.getHoverName());
         age = book.get(ModDataComponents.AGE_REFERENCE.get());
+        displayName = book.get(DataComponents.CUSTOM_NAME);
         generationProfile = book.get(ModDataComponents.AGE_GENERATION_PROFILE.get());
         this.traits = traits;
         writing = book.getOrDefault(ModDataComponents.BOOK_WRITING.get(), OrderedWriting.EMPTY);
@@ -82,6 +85,7 @@ public final class DescriptiveBookScreen extends Screen implements ExplorableBoo
                                  List<SymbolDisplayMetadata> writingSymbols) {
         super(book.getHoverName());
         age = book.get(ModDataComponents.AGE_REFERENCE.get());
+        displayName = book.get(DataComponents.CUSTOM_NAME);
         generationProfile = book.get(ModDataComponents.AGE_GENERATION_PROFILE.get());
         this.traits = traits;
         writing = book.getOrDefault(ModDataComponents.BOOK_WRITING.get(), OrderedWriting.EMPTY);
@@ -245,7 +249,8 @@ public final class DescriptiveBookScreen extends Screen implements ExplorableBoo
             }
             return;
         }
-        int nameEnd = drawWrappedWithoutShadow(graphics, Component.literal(age.name()),
+        int nameEnd = drawWrappedWithoutShadow(graphics,
+                displayName == null ? Component.literal(age.name()) : displayName,
                 x, top + 40, 110);
         int detailsY = drawWrappedWithoutShadow(graphics,
                 author == null || author.isBlank()

src/main/java/net/dnorberg/rivencraft/client/screen/LinkModifierScreen.java

@@ -0,0 +1,105 @@
+package net.dnorberg.rivencraft.client.screen;
+
+import net.dnorberg.rivencraft.book.LinkProperties;
+import net.dnorberg.rivencraft.menu.LinkModifierMenu;
+import net.dnorberg.rivencraft.network.SetLinkModifierTitlePayload;
+import net.dnorberg.rivencraft.registry.ModDataComponents;
+import net.dnorberg.rivencraft.registry.ModItems;
+import net.minecraft.client.gui.GuiGraphics;
+import net.minecraft.client.gui.components.Button;
+import net.minecraft.client.gui.components.EditBox;
+import net.minecraft.client.gui.screens.inventory.AbstractContainerScreen;
+import net.minecraft.core.component.DataComponents;
+import net.minecraft.network.chat.Component;
+import net.minecraft.world.entity.player.Inventory;
+import net.minecraft.world.item.ItemStack;
+import net.neoforged.neoforge.network.PacketDistributor;
+
+public final class LinkModifierScreen extends AbstractContainerScreen<LinkModifierMenu> {
+    private EditBox titleInput;
+    private Button disarm;
+    private Button momentum;
+    private Button intra;
+    private Button retire;
+    private ItemStack lastBook = ItemStack.EMPTY;
+
+    public LinkModifierScreen(LinkModifierMenu menu, Inventory inventory, Component title) {
+        super(menu, inventory, title);
+        imageWidth = 176;
+        imageHeight = 194;
+        inventoryLabelX = 8;
+        inventoryLabelY = 99;
+    }
+
+    @Override protected void init() {
+        super.init();
+        titleInput = new EditBox(font, leftPos + 8, topPos + 54, 160, 14,
+                Component.translatable("screen.rivencraft.link_modifier.title"));
+        titleInput.setMaxLength(32);
+        titleInput.setResponder(value -> PacketDistributor.sendToServer(
+                new SetLinkModifierTitlePayload(menu.containerId, value)));
+        addRenderableWidget(titleInput);
+        disarm = addRenderableWidget(Button.builder(Component.empty(), button -> click(LinkModifierMenu.TOGGLE_DISARM))
+                .bounds(leftPos + 8, topPos + 74, 76, 20).build());
+        momentum = addRenderableWidget(Button.builder(Component.empty(), button -> click(LinkModifierMenu.TOGGLE_MOMENTUM))
+                .bounds(leftPos + 92, topPos + 74, 76, 20).build());
+        intra = addRenderableWidget(Button.builder(Component.empty(), button -> click(LinkModifierMenu.TOGGLE_INTRA))
+                .bounds(leftPos + 8, topPos + 18, 64, 20).build());
+        retire = addRenderableWidget(Button.builder(Component.empty(), button -> click(LinkModifierMenu.DELETE_AGE))
+                .bounds(leftPos + 104, topPos + 18, 64, 20).build());
+        refreshControls();
+    }
+
+    private void click(int id) {
+        if (minecraft != null && minecraft.gameMode != null) {
+            minecraft.gameMode.handleInventoryButtonClick(menu.containerId, id);
+        }
+    }
+
+    @Override protected void containerTick() { refreshControls(); }
+
+    private void refreshControls() {
+        ItemStack book = menu.book();
+        if (!ItemStack.isSameItemSameComponents(book, lastBook) && !titleInput.isFocused()) {
+            Component name = book.get(DataComponents.CUSTOM_NAME);
+            titleInput.setValue(name == null ? "" : name.getString());
+            lastBook = book.copy();
+        }
+        boolean present = !book.isEmpty();
+        titleInput.setEditable(present);
+        LinkProperties properties = book.getOrDefault(ModDataComponents.LINK_PROPERTIES.get(), LinkProperties.NONE);
+        disarm.active = present;
+        disarm.setMessage(Component.literal("Disarm " + (properties.has(LinkProperties.DISARM) ? "✓" : "×")));
+        momentum.active = present;
+        momentum.setMessage(Component.literal("Momentum " + (properties.has(LinkProperties.MAINTAIN_MOMENTUM) ? "✓" : "×")));
+        intra.visible = book.is(ModItems.LINKING_BOOK.get());
+        intra.setMessage(Component.literal("Intra " + (properties.has(LinkProperties.INTRA_LINKING) ? "✓" : "×")));
+        retire.visible = menu.canDelete(minecraft.player);
+        retire.setMessage(Component.translatable(menu.awaitingDeletionConfirmation()
+                ? "screen.rivencraft.link_modifier.confirm" : "screen.rivencraft.link_modifier.retire"));
+    }
+
+    @Override protected void renderBg(GuiGraphics graphics, float partialTick, int mouseX, int mouseY) {
+        graphics.fill(leftPos, topPos, leftPos + imageWidth, topPos + imageHeight, 0xFFD6C7A7);
+        graphics.renderOutline(leftPos, topPos, imageWidth, imageHeight, 0xFF493C34);
+        graphics.fill(leftPos + 78, topPos + 28, leftPos + 98, topPos + 48, 0xFF83785F);
+        graphics.renderOutline(leftPos + 77, topPos + 27, 22, 22, 0xFF493C34);
+        for (int row = 0; row < 3; row++) for (int col = 0; col < 9; col++)
+            slotBackground(graphics, 8 + col * 18, 112 + row * 18);
+        for (int col = 0; col < 9; col++) slotBackground(graphics, 8 + col * 18, 170);
+    }
+
+    private void slotBackground(GuiGraphics graphics, int x, int y) {
+        graphics.fill(leftPos + x - 1, topPos + y - 1, leftPos + x + 17, topPos + y + 17, 0xFF81745C);
+    }
+
+    @Override protected void renderLabels(GuiGraphics graphics, int mouseX, int mouseY) {
+        graphics.drawString(font, title, 8, 6, 0xFF332722, false);
+        graphics.drawString(font, playerInventoryTitle, inventoryLabelX, inventoryLabelY, 0xFF332722, false);
+    }
+
+    @Override public void render(GuiGraphics graphics, int mouseX, int mouseY, float partialTick) {
+        super.render(graphics, mouseX, mouseY, partialTick);
+        renderTooltip(graphics, mouseX, mouseY);
+    }
+}

src/main/java/net/dnorberg/rivencraft/client/screen/NotebookScreen.java

@@ -182,9 +182,9 @@ public final class NotebookScreen extends AbstractContainerScreen<NotebookMenu>
 
     private int displayedPageSlots() {
         if (menu.getCarried().is(ModItems.PAGE.get())) {
-            return NotebookMenu.NOTEBOOK_SLOTS;
+            return menu.pageCapacity();
         }
-        for (int index = NotebookMenu.NOTEBOOK_SLOTS - 1; index >= 0; index--) {
+        for (int index = menu.pageCapacity() - 1; index >= 0; index--) {
             if (!menu.getSlot(index).getItem().isEmpty()) {
                 return index + 1;
             }

src/main/java/net/dnorberg/rivencraft/client/screen/WritingDeskScreen.java

@@ -12,6 +12,7 @@ import net.dnorberg.rivencraft.menu.WritingDeskMenu;
 import net.dnorberg.rivencraft.block.entity.WritingDeskBlockEntity;
 import net.dnorberg.rivencraft.registry.ModDataComponents;
 import net.dnorberg.rivencraft.registry.ModItems;
+import net.dnorberg.rivencraft.item.CollationFolderItem;
 import net.dnorberg.rivencraft.writing.NotebookContents;
 import net.dnorberg.rivencraft.writing.SymbolDisplayMetadata;
 import net.minecraft.client.gui.GuiGraphics;
@@ -234,7 +235,7 @@ public final class WritingDeskScreen extends AbstractContainerScreen<WritingDesk
     private List<ItemStack> pages(int collectionIndex) {
         ItemStack collection = menu.getSlot(collectionIndex).getItem();
         if (collection.is(ModItems.PAGE.get())) return List.of(collection);
-        if (collection.is(ModItems.NOTEBOOK.get())) {
+        if (CollationFolderItem.isCollection(collection)) {
             return collection.getOrDefault(ModDataComponents.NOTEBOOK_CONTENTS.get(), NotebookContents.EMPTY).pages();
         }
         return List.of();
@@ -301,9 +302,9 @@ public final class WritingDeskScreen extends AbstractContainerScreen<WritingDesk
 
     private boolean canMovePage(DisplayPage source, DisplayPage target) {
         return !source.stack().isEmpty()
-                && (menu.getSlot(source.collection()).getItem().is(ModItems.NOTEBOOK.get())
+                && (CollationFolderItem.isCollection(menu.getSlot(source.collection()).getItem())
                     || menu.getSlot(source.collection()).getItem().is(ModItems.PAGE.get()))
-                && (menu.getSlot(target.collection()).getItem().is(ModItems.NOTEBOOK.get())
+                && (CollationFolderItem.isCollection(menu.getSlot(target.collection()).getItem())
                     || menu.getSlot(target.collection()).getItem().is(ModItems.PAGE.get()))
                 && (source.collection() != target.collection() || source.index() != target.index());
     }
@@ -317,10 +318,10 @@ public final class WritingDeskScreen extends AbstractContainerScreen<WritingDesk
             if (!slot.mayPlace(held)) return -1;
             ItemStack current = slot.getItem();
             if (current.isEmpty()) return index;
-            if (index < WritingDeskBlockEntity.COLLECTIONS && current.is(ModItems.NOTEBOOK.get())) {
+            if (index < WritingDeskBlockEntity.COLLECTIONS && CollationFolderItem.isCollection(current)) {
                 List<ItemStack> pages = current.getOrDefault(
                         ModDataComponents.NOTEBOOK_CONTENTS.get(), NotebookContents.EMPTY).pages();
-                if (pages.size() < NotebookContents.MAX_PAGES || pages.stream().anyMatch(ItemStack::isEmpty))
+                if (pages.size() < CollationFolderItem.capacity(current) || pages.stream().anyMatch(ItemStack::isEmpty))
                     return index;
             } else if (index > WritingDeskMenu.COPY_RESULT && ItemStack.isSameItemSameComponents(current, held)
                     && current.getCount() < slot.getMaxStackSize(held)) return index;

src/main/java/net/dnorberg/rivencraft/command/RivencraftCommands.java

@@ -112,8 +112,9 @@ public final class RivencraftCommands {
         source.sendSuccess(() -> Component.literal("Rivencraft Ages: " + ages.size()), false);
         for (AgeDefinition age : ages) {
             boolean loaded = source.getServer().getLevel(AgeDimensionService.dimensionKey(age)) != null;
+            boolean retired = AgeRegistrySavedData.get(source.getLevel()).isDead(age.id());
             source.sendSuccess(() -> Component.literal(
-                    (loaded ? "[loaded] " : "[unloaded] ")
+                    (retired ? "[retired] " : loaded ? "[loaded] " : "[unloaded] ")
                             + age.name() + " — " + age.dimensionId()
                             + (age.seasonMode() == null ? "" : " (season: "
                             + age.seasonMode().name().toLowerCase(java.util.Locale.ROOT) + ")")

src/main/java/net/dnorberg/rivencraft/item/CollationFolderItem.java

@@ -0,0 +1,23 @@
+package net.dnorberg.rivencraft.item;
+
+import net.dnorberg.rivencraft.registry.ModItems;
+import net.dnorberg.rivencraft.writing.NotebookContents;
+import net.minecraft.world.item.ItemStack;
+
+/** Legacy's compact page collection, using the existing Notebook page editor. */
+public final class CollationFolderItem extends NotebookItem {
+    public static final int MAX_PAGES = 27;
+
+    public CollationFolderItem(Properties properties) {
+        super(properties);
+    }
+
+    public static boolean isCollection(ItemStack stack) {
+        return stack.is(ModItems.NOTEBOOK.get()) || stack.is(ModItems.COLLATION_FOLDER.get());
+    }
+
+    public static int capacity(ItemStack stack) {
+        return stack.is(ModItems.COLLATION_FOLDER.get()) ? MAX_PAGES
+                : stack.is(ModItems.NOTEBOOK.get()) ? NotebookContents.MAX_PAGES : 0;
+    }
+}

src/main/java/net/dnorberg/rivencraft/item/NotebookItem.java

@@ -16,7 +16,7 @@ import net.minecraft.world.item.ItemStack;
 import net.minecraft.world.item.TooltipFlag;
 import net.minecraft.world.level.Level;
 
-public final class NotebookItem extends Item {
+public class NotebookItem extends Item {
     public NotebookItem(Properties properties) {
         super(properties);
     }
@@ -39,7 +39,9 @@ public final class NotebookItem extends Item {
         NotebookContents contents = stack.getOrDefault(
                 ModDataComponents.NOTEBOOK_CONTENTS.get(), NotebookContents.EMPTY);
         tooltip.add(Component.translatable("item.rivencraft.notebook.pages",
-                contents.pageCount(), NotebookContents.MAX_PAGES).withStyle(ChatFormatting.GRAY));
+                contents.pageCount(), stack.is(net.dnorberg.rivencraft.registry.ModItems.COLLATION_FOLDER.get())
+                        ? CollationFolderItem.MAX_PAGES : NotebookContents.MAX_PAGES)
+                .withStyle(ChatFormatting.GRAY));
         if (contents.unresolvedCount() > 0) {
             tooltip.add(Component.translatable("item.rivencraft.notebook.unresolved",
                     contents.unresolvedCount()).withStyle(ChatFormatting.RED));

src/main/java/net/dnorberg/rivencraft/item/SealedNotebookItem.java

@@ -0,0 +1,62 @@
+package net.dnorberg.rivencraft.item;
+
+import java.util.ArrayList;
+import java.util.List;
+import net.dnorberg.rivencraft.registry.ModDataComponents;
+import net.dnorberg.rivencraft.registry.ModItems;
+import net.dnorberg.rivencraft.writing.NotebookContents;
+import net.dnorberg.rivencraft.writing.SymbolCatalog;
+import net.dnorberg.rivencraft.writing.SymbolReference;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.server.level.ServerPlayer;
+import net.minecraft.world.InteractionHand;
+import net.minecraft.world.InteractionResultHolder;
+import net.minecraft.world.entity.player.Player;
+import net.minecraft.world.item.Item;
+import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.level.Level;
+
+/** Opens into a 16-page Collation Folder, as Legacy's booster item did. */
+public final class SealedNotebookItem extends Item {
+    private static final int PAGE_COUNT = 16;
+
+    public SealedNotebookItem(Properties properties) {
+        super(properties);
+    }
+
+    @Override
+    public InteractionResultHolder<ItemStack> use(Level level, Player player, InteractionHand hand) {
+        ItemStack sealed = player.getItemInHand(hand);
+        if (level.isClientSide) return InteractionResultHolder.sidedSuccess(sealed, true);
+        if (!(player instanceof ServerPlayer serverPlayer)) return InteractionResultHolder.pass(sealed);
+        ItemStack folder = open(serverPlayer);
+        if (folder.isEmpty()) return InteractionResultHolder.fail(sealed);
+        if (!player.hasInfiniteMaterials()) sealed.shrink(1);
+        if (sealed.isEmpty()) {
+            player.setItemInHand(hand, folder);
+        } else if (!player.getInventory().add(folder)) {
+            player.drop(folder, false);
+        }
+        return InteractionResultHolder.success(player.getItemInHand(hand));
+    }
+
+    static ItemStack open(ServerPlayer player) {
+        // Current symbol definitions have no Legacy rank. Draw from the authored
+        // symbol pool, excluding virtual block/biome pages and corrupted pages.
+        List<ResourceLocation> candidates = SymbolCatalog.symbols().entrySet().stream()
+                .filter(entry -> entry.getKey().getNamespace().equals("rivencraft")
+                        && !entry.getKey().getPath().startsWith("block/")
+                        && !entry.getKey().getPath().startsWith("biome/")
+                        && !entry.getValue().category().getPath().equals("corrupted"))
+                .map(java.util.Map.Entry::getKey).sorted().toList();
+        if (candidates.isEmpty()) return ItemStack.EMPTY;
+        List<ItemStack> pages = new ArrayList<>(PAGE_COUNT);
+        for (int i = 0; i < PAGE_COUNT; i++) {
+            ResourceLocation id = candidates.get(player.getRandom().nextInt(candidates.size()));
+            pages.add(PageItem.createSymbolPage(new SymbolReference(id)));
+        }
+        ItemStack folder = new ItemStack(ModItems.COLLATION_FOLDER.get());
+        folder.set(ModDataComponents.NOTEBOOK_CONTENTS.get(), new NotebookContents(pages));
+        return folder;
+    }
+}

src/main/java/net/dnorberg/rivencraft/menu/BookBinderMenu.java

@@ -6,6 +6,7 @@ import net.dnorberg.rivencraft.block.entity.BookBinderBlockEntity;
 import net.dnorberg.rivencraft.item.PageItem;
 import net.dnorberg.rivencraft.registry.ModDataComponents;
 import net.dnorberg.rivencraft.registry.ModItems;
+import net.dnorberg.rivencraft.item.CollationFolderItem;
 import net.dnorberg.rivencraft.registry.ModMenus;
 import net.dnorberg.rivencraft.writing.PageContent;
 import net.dnorberg.rivencraft.writing.WritingGrammar;
@@ -172,7 +173,7 @@ public final class BookBinderMenu extends AbstractContainerMenu {
 
     private boolean clickStrip(int index) {
         ItemStack carried = getCarried();
-        if (carried.is(ModItems.NOTEBOOK.get())) {
+        if (CollationFolderItem.isCollection(carried)) {
             ItemStack emptied = binder.importNotebookFromStack(carried, Math.min(index == 0 ? 0 : index - 1,
                     binder.nextPageIndex()));
             if (emptied.isEmpty()) return false;
@@ -227,7 +228,7 @@ public final class BookBinderMenu extends AbstractContainerMenu {
             moved = moveItemStackTo(source, PLAYER_START, slots.size(), true);
         } else if (source.is(Items.LEATHER) || BookBinderBlockEntity.validCover(source)) {
             moved = moveItemStackTo(source, BookBinderBlockEntity.COVER, BookBinderBlockEntity.COVER + 1, false);
-        } else if (source.is(ModItems.NOTEBOOK.get())) {
+        } else if (CollationFolderItem.isCollection(source)) {
             ItemStack emptied = binder.importNotebookFromStack(source, binder.nextPageIndex());
             if (emptied.isEmpty()) return ItemStack.EMPTY;
             sourceSlot.setByPlayer(emptied);

src/main/java/net/dnorberg/rivencraft/menu/LinkModifierMenu.java

@@ -0,0 +1,145 @@
+package net.dnorberg.rivencraft.menu;
+
+import java.util.UUID;
+import net.dnorberg.rivencraft.block.entity.LinkModifierBlockEntity;
+import net.dnorberg.rivencraft.book.AgeDefinition;
+import net.dnorberg.rivencraft.book.AgeDeletionService;
+import net.dnorberg.rivencraft.book.AgeReference;
+import net.dnorberg.rivencraft.book.AgeRegistrySavedData;
+import net.dnorberg.rivencraft.book.LinkProperties;
+import net.dnorberg.rivencraft.registry.ModDataComponents;
+import net.dnorberg.rivencraft.registry.ModItems;
+import net.dnorberg.rivencraft.registry.ModMenus;
+import net.minecraft.core.component.DataComponents;
+import net.minecraft.network.RegistryFriendlyByteBuf;
+import net.minecraft.network.chat.Component;
+import net.minecraft.server.level.ServerPlayer;
+import net.minecraft.world.Container;
+import net.minecraft.world.SimpleContainer;
+import net.minecraft.world.entity.player.Inventory;
+import net.minecraft.world.entity.player.Player;
+import net.minecraft.world.inventory.AbstractContainerMenu;
+import net.minecraft.world.inventory.DataSlot;
+import net.minecraft.world.inventory.Slot;
+import net.minecraft.world.item.ItemStack;
+
+/** Server-owned book edits and a two-stage, OP-only Age retirement control. */
+public final class LinkModifierMenu extends AbstractContainerMenu {
+    public static final int TOGGLE_DISARM = 1;
+    public static final int TOGGLE_MOMENTUM = 2;
+    public static final int TOGGLE_INTRA = 3;
+    public static final int DELETE_AGE = 4;
+    private static final int PLAYER_START = 1;
+    private static final int MAX_TITLE_LENGTH = 32;
+
+    private final LinkModifierBlockEntity modifier;
+    private final Container bookSlot;
+    private final boolean clientSide;
+    private int confirmation;
+    private UUID pendingAge;
+
+    public LinkModifierMenu(int id, Inventory inventory, RegistryFriendlyByteBuf data) {
+        this(id, inventory, inventory.player.level().getBlockEntity(data.readBlockPos())
+                instanceof LinkModifierBlockEntity found ? found : null);
+    }
+
+    public LinkModifierMenu(int id, Inventory inventory, LinkModifierBlockEntity modifier) {
+        super(ModMenus.LINK_MODIFIER.get(), id);
+        this.modifier = modifier;
+        this.bookSlot = modifier == null ? new SimpleContainer(1) : modifier;
+        this.clientSide = inventory.player.level().isClientSide;
+        addDataSlot(new DataSlot() {
+            @Override public int get() { return confirmation; }
+            @Override public void set(int value) { confirmation = value; }
+        });
+        addSlot(new Slot(bookSlot, 0, 80, 30) {
+            @Override public boolean mayPlace(ItemStack stack) { return bookSlot.canPlaceItem(0, stack); }
+            @Override public int getMaxStackSize() { return 1; }
+            @Override public void setChanged() {
+                super.setChanged();
+                pendingAge = null;
+                confirmation = 0;
+            }
+        });
+        for (int row = 0; row < 3; row++) for (int col = 0; col < 9; col++)
+            addSlot(new Slot(inventory, col + row * 9 + 9, 8 + col * 18, 112 + row * 18));
+        for (int col = 0; col < 9; col++)
+            addSlot(new Slot(inventory, col, 8 + col * 18, 170));
+    }
+
+    public ItemStack book() { return bookSlot.getItem(0); }
+    public boolean awaitingDeletionConfirmation() { return confirmation == 1; }
+    public boolean canDelete(Player player) {
+        return player.hasPermissions(2) && book().is(ModItems.DESCRIPTIVE_BOOK.get())
+                && book().has(ModDataComponents.AGE_REFERENCE.get());
+    }
+
+    public boolean setTitle(Player player, String title) {
+        if (clientSide || !stillValid(player) || title == null || title.length() > MAX_TITLE_LENGTH
+                || book().isEmpty()) return false;
+        String clean = title.strip();
+        if (clean.isEmpty()) book().remove(DataComponents.CUSTOM_NAME);
+        else book().set(DataComponents.CUSTOM_NAME, Component.literal(clean));
+        bookSlot.setChanged();
+        broadcastChanges();
+        return true;
+    }
+
+    @Override public boolean clickMenuButton(Player player, int id) {
+        if (clientSide || !stillValid(player) || book().isEmpty()) return false;
+        if (id == DELETE_AGE) return retireAge(player);
+        int flag = switch (id) {
+            case TOGGLE_DISARM -> LinkProperties.DISARM;
+            case TOGGLE_MOMENTUM -> LinkProperties.MAINTAIN_MOMENTUM;
+            case TOGGLE_INTRA -> LinkProperties.INTRA_LINKING;
+            default -> 0;
+        };
+        if (flag == 0 || (flag == LinkProperties.INTRA_LINKING
+                && book().is(ModItems.DESCRIPTIVE_BOOK.get()))) return false;
+        int flags = book().getOrDefault(ModDataComponents.LINK_PROPERTIES.get(), LinkProperties.NONE).flags();
+        book().set(ModDataComponents.LINK_PROPERTIES.get(), new LinkProperties(flags ^ flag));
+        bookSlot.setChanged();
+        pendingAge = null;
+        confirmation = 0;
+        broadcastChanges();
+        return true;
+    }
+
+    private boolean retireAge(Player player) {
+        if (!(player instanceof ServerPlayer serverPlayer) || !canDelete(player)) return false;
+        AgeReference reference = book().get(ModDataComponents.AGE_REFERENCE.get());
+        if (reference == null) return false;
+        AgeDefinition age = AgeRegistrySavedData.get(serverPlayer.serverLevel()).find(reference.id()).orElse(null);
+        if (age == null) return false;
+        if (confirmation != 1 || !reference.id().equals(pendingAge)) {
+            pendingAge = reference.id();
+            confirmation = 1;
+            broadcastChanges();
+            return true;
+        }
+        confirmation = 0;
+        pendingAge = null;
+        AgeDeletionService.Result result = AgeDeletionService.retire(serverPlayer.getServer(), age);
+        player.displayClientMessage(Component.translatable(
+                "message.rivencraft.link_modifier.delete." + result.name().toLowerCase()), false);
+        broadcastChanges();
+        return result == AgeDeletionService.Result.RETIRED;
+    }
+
+    @Override public boolean stillValid(Player player) {
+        return modifier != null && modifier.stillValid(player);
+    }
+
+    @Override public ItemStack quickMoveStack(Player player, int index) {
+        Slot slot = slots.get(index);
+        if (!slot.hasItem()) return ItemStack.EMPTY;
+        ItemStack source = slot.getItem();
+        ItemStack copy = source.copy();
+        if (index == 0) {
+            if (!moveItemStackTo(source, PLAYER_START, slots.size(), true)) return ItemStack.EMPTY;
+        } else if (!moveItemStackTo(source, 0, 1, false)) return ItemStack.EMPTY;
+        if (source.isEmpty()) slot.set(ItemStack.EMPTY);
+        else slot.setChanged();
+        return copy;
+    }
+}

src/main/java/net/dnorberg/rivencraft/menu/NotebookMenu.java

@@ -7,6 +7,7 @@ import net.dnorberg.rivencraft.registry.ModMenus;
 import net.dnorberg.rivencraft.writing.NotebookContents;
 import net.dnorberg.rivencraft.writing.PageContent;
 import net.dnorberg.rivencraft.item.PageItem;
+import net.dnorberg.rivencraft.item.CollationFolderItem;
 import net.minecraft.core.NonNullList;
 import net.minecraft.network.RegistryFriendlyByteBuf;
 import net.minecraft.world.Container;
@@ -28,6 +29,7 @@ public final class NotebookMenu extends AbstractContainerMenu {
     private final InteractionHand hand;
     private final int openedHotbarSlot;
     private final NotebookContainer contents;
+    private final int pageCapacity;
 
     public NotebookMenu(int containerId, Inventory inventory, RegistryFriendlyByteBuf data) {
         this(containerId, inventory, data.readBoolean() ? InteractionHand.OFF_HAND : InteractionHand.MAIN_HAND);
@@ -38,11 +40,12 @@ public final class NotebookMenu extends AbstractContainerMenu {
         this.playerInventory = inventory;
         this.hand = hand;
         this.openedHotbarSlot = inventory.selected;
+        this.pageCapacity = CollationFolderItem.capacity(inventory.player.getItemInHand(hand));
         this.contents = new NotebookContainer(inventory, hand);
 
         for (int page = 0; page < NOTEBOOK_SLOTS; page++) {
             // The client draws these pages on a filtered, scrollable surface instead.
-            addSlot(new PageSlot(contents, page, -1000, -1000));
+            addSlot(new PageSlot(contents, page, -1000, -1000, page < pageCapacity));
         }
         for (int row = 0; row < 3; row++) {
             for (int column = 0; column < 9; column++) {
@@ -61,11 +64,13 @@ public final class NotebookMenu extends AbstractContainerMenu {
                 : new Slot(playerInventory, inventoryIndex, x, y);
     }
 
+    public int pageCapacity() { return pageCapacity; }
+
     @Override
     public boolean stillValid(Player player) {
         return player.isAlive()
                 && (hand == InteractionHand.OFF_HAND || player.getInventory().selected == openedHotbarSlot)
-                && player.getItemInHand(hand).is(ModItems.NOTEBOOK.get());
+                && CollationFolderItem.isCollection(player.getItemInHand(hand));
     }
 
     @Override
@@ -108,7 +113,7 @@ public final class NotebookMenu extends AbstractContainerMenu {
         } else {
             return false;
         }
-        if (source < 0 || source >= NOTEBOOK_SLOTS || target < 0 || target >= NOTEBOOK_SLOTS
+        if (source < 0 || source >= pageCapacity || target < 0 || target >= pageCapacity
                 || contents.getItem(source).isEmpty()) {
             return false;
         }
@@ -132,14 +137,18 @@ public final class NotebookMenu extends AbstractContainerMenu {
     }
 
     private static final class PageSlot extends Slot {
-        private PageSlot(Container container, int slot, int x, int y) {
+        private final boolean enabled;
+
+        private PageSlot(Container container, int slot, int x, int y, boolean enabled) {
             super(container, slot, x, y);
+            this.enabled = enabled;
         }
 
         @Override public boolean mayPlace(ItemStack stack) {
-            return stack.is(ModItems.PAGE.get())
+            return enabled && stack.is(ModItems.PAGE.get())
                     && PageItem.content(stack).kind() != PageContent.Kind.LINK_PANEL;
         }
+        @Override public boolean mayPickup(Player player) { return enabled; }
         @Override public int getMaxStackSize() { return 1; }
     }
 
@@ -184,11 +193,12 @@ public final class NotebookMenu extends AbstractContainerMenu {
         public void setChanged() {
             super.setChanged();
             ItemStack notebook = inventory.player.getItemInHand(hand);
-            if (loading || !notebook.is(ModItems.NOTEBOOK.get())) {
+            if (loading || !CollationFolderItem.isCollection(notebook)) {
                 return;
             }
-            NonNullList<ItemStack> saved = NonNullList.withSize(NOTEBOOK_SLOTS, ItemStack.EMPTY);
-            for (int index = 0; index < NOTEBOOK_SLOTS; index++) {
+            int capacity = CollationFolderItem.capacity(notebook);
+            NonNullList<ItemStack> saved = NonNullList.withSize(capacity, ItemStack.EMPTY);
+            for (int index = 0; index < capacity; index++) {
                 ItemStack page = getItem(index);
                 saved.set(index, page.isEmpty() ? ItemStack.EMPTY : page.copyWithCount(1));
             }

src/main/java/net/dnorberg/rivencraft/menu/WritingDeskMenu.java

@@ -7,6 +7,7 @@ import net.dnorberg.rivencraft.registry.ModDataComponents;
 import net.dnorberg.rivencraft.registry.ModItems;
 import net.dnorberg.rivencraft.registry.ModMenus;
 import net.dnorberg.rivencraft.writing.NotebookContents;
+import net.dnorberg.rivencraft.item.CollationFolderItem;
 import net.dnorberg.rivencraft.writing.PageContent;
 import net.dnorberg.rivencraft.writing.SymbolCatalog;
 import net.dnorberg.rivencraft.writing.SymbolDisplayMetadata;
@@ -107,7 +108,7 @@ public final class WritingDeskMenu extends AbstractContainerMenu {
     public int pageCapacity(int collectionIndex) {
         if (collectionIndex < 0 || collectionIndex >= WritingDeskBlockEntity.COLLECTIONS) return 0;
         ItemStack collection = desk.getItem(collectionIndex);
-        return collection.is(ModItems.NOTEBOOK.get()) ? NotebookContents.MAX_PAGES
+        return CollationFolderItem.isCollection(collection) ? CollationFolderItem.capacity(collection)
                 : collection.is(ModItems.PAGE.get()) ? 1 : 0;
     }
     public List<SymbolDisplayMetadata> catalog() { return catalog; }
@@ -183,7 +184,8 @@ public final class WritingDeskMenu extends AbstractContainerMenu {
         ItemStack carried = getCarried();
         if (clientSide || !storablePage(carried)) return false;
         ItemStack collection = desk.getItem(collectionIndex);
-        if (collection.is(ModItems.NOTEBOOK.get())) {
+        if (CollationFolderItem.isCollection(collection)) {
+            if (pageIndex < 0 || pageIndex >= CollationFolderItem.capacity(collection)) return false;
             var pages = new java.util.ArrayList<>(collection.getOrDefault(
                     ModDataComponents.NOTEBOOK_CONTENTS.get(), NotebookContents.EMPTY).pages());
             while (pages.size() <= pageIndex) pages.add(ItemStack.EMPTY);
@@ -207,8 +209,10 @@ public final class WritingDeskMenu extends AbstractContainerMenu {
         if (!getCarried().isEmpty() || sourceCollection == targetCollection && sourcePage == targetPage) return false;
         ItemStack sourceBook = desk.getItem(sourceCollection);
         ItemStack targetBook = desk.getItem(targetCollection);
-        boolean sourceNotebook = sourceBook.is(ModItems.NOTEBOOK.get());
-        boolean targetNotebook = targetBook.is(ModItems.NOTEBOOK.get());
+        boolean sourceNotebook = CollationFolderItem.isCollection(sourceBook);
+        boolean targetNotebook = CollationFolderItem.isCollection(targetBook);
+        if (sourceNotebook && sourcePage >= CollationFolderItem.capacity(sourceBook)
+                || targetNotebook && targetPage >= CollationFolderItem.capacity(targetBook)) return false;
         if ((!sourceNotebook && (!sourceBook.is(ModItems.PAGE.get()) || sourcePage != 0))
                 || (!targetNotebook && (!targetBook.is(ModItems.PAGE.get()) || targetPage != 0))) return false;
         var sourcePages = sourceNotebook ? new java.util.ArrayList<>(sourceBook.getOrDefault(
@@ -247,7 +251,8 @@ public final class WritingDeskMenu extends AbstractContainerMenu {
     private boolean extractPage(int sourceCollection, int sourcePage, int targetSlot) {
         if (!getCarried().isEmpty() || targetSlot < -1 || targetSlot >= slots.size()) return false;
         ItemStack sourceBook = desk.getItem(sourceCollection);
-        boolean sourceNotebook = sourceBook.is(ModItems.NOTEBOOK.get());
+        boolean sourceNotebook = CollationFolderItem.isCollection(sourceBook);
+        if (sourceNotebook && sourcePage >= CollationFolderItem.capacity(sourceBook)) return false;
         if (!sourceNotebook && (!sourceBook.is(ModItems.PAGE.get()) || sourcePage != 0)) return false;
         var sourcePages = sourceNotebook ? new java.util.ArrayList<>(sourceBook.getOrDefault(
                 ModDataComponents.NOTEBOOK_CONTENTS.get(), NotebookContents.EMPTY).pages()) : null;
@@ -263,12 +268,12 @@ public final class WritingDeskMenu extends AbstractContainerMenu {
             Slot target = slots.get(targetSlot);
             if (!target.isActive() || !target.mayPlace(moving)) return false;
             ItemStack current = target.getItem();
-            if (targetSlot < WritingDeskBlockEntity.COLLECTIONS && current.is(ModItems.NOTEBOOK.get())) {
+            if (targetSlot < WritingDeskBlockEntity.COLLECTIONS && CollationFolderItem.isCollection(current)) {
                 var targetPages = targetSlot == sourceCollection ? sourcePages
                         : new java.util.ArrayList<>(current.getOrDefault(
                                 ModDataComponents.NOTEBOOK_CONTENTS.get(), NotebookContents.EMPTY).pages());
                 int position = -1;
-                for (int i = 0; i < NotebookContents.MAX_PAGES; i++) {
+                for (int i = 0; i < CollationFolderItem.capacity(current); i++) {
                     if (i >= targetPages.size() || targetPages.get(i).isEmpty()) {
                         position = i;
                         break;
@@ -342,7 +347,7 @@ public final class WritingDeskMenu extends AbstractContainerMenu {
     private boolean moveIntoDesk(ItemStack moving) {
         if (moving.is(ModItems.INK_VIAL.get())) return moveItemStackTo(moving,
                 WritingDeskBlockEntity.INK, WritingDeskBlockEntity.INK + 1, false);
-        if (moving.is(ModItems.NOTEBOOK.get())) return moveItemStackTo(moving, firstVisibleTab, firstVisibleTab + VISIBLE_TABS, false);
+        if (CollationFolderItem.isCollection(moving)) return moveItemStackTo(moving, firstVisibleTab, firstVisibleTab + VISIBLE_TABS, false);
         if (moving.is(Items.PAPER))
             return moveItemStackTo(moving, WritingDeskBlockEntity.PAPER,
                     WritingDeskBlockEntity.PAPER + 1, false);
@@ -374,7 +379,8 @@ public final class WritingDeskMenu extends AbstractContainerMenu {
                 || pageIndex < 0 || pageIndex >= NotebookContents.MAX_PAGES) return ItemStack.EMPTY;
         ItemStack collection = desk.getItem(collectionIndex);
         if (collection.is(ModItems.PAGE.get())) return pageIndex == 0 ? collection : ItemStack.EMPTY;
-        if (collection.is(ModItems.NOTEBOOK.get())) {
+        if (CollationFolderItem.isCollection(collection)) {
+            if (pageIndex >= CollationFolderItem.capacity(collection)) return ItemStack.EMPTY;
             List<ItemStack> pages = collection.getOrDefault(
                     ModDataComponents.NOTEBOOK_CONTENTS.get(), NotebookContents.EMPTY).pages();
             return pageIndex < pages.size() ? pages.get(pageIndex) : ItemStack.EMPTY;

src/main/java/net/dnorberg/rivencraft/network/ModNetworking.java

@@ -18,6 +18,7 @@ import net.dnorberg.rivencraft.event.AgeCelestialAngleSync;
 import net.dnorberg.rivencraft.item.DescriptiveBookItem;
 import net.dnorberg.rivencraft.item.LinkingBookItem;
 import net.dnorberg.rivencraft.menu.BookBinderMenu;
+import net.dnorberg.rivencraft.menu.LinkModifierMenu;
 import net.dnorberg.rivencraft.registry.ModDataComponents;
 import net.dnorberg.rivencraft.registry.ModItems;
 import net.dnorberg.rivencraft.writing.OrderedWriting;
@@ -59,7 +60,7 @@ public final class ModNetworking {
     }
 
     public static void register(RegisterPayloadHandlersEvent event) {
-        PayloadRegistrar registrar = event.registrar("15");
+        PayloadRegistrar registrar = event.registrar("16");
         registrar.playToServer(RequestDescriptiveBookScreenPayload.TYPE, RequestDescriptiveBookScreenPayload.STREAM_CODEC,
                 ModNetworking::requestDescriptiveBookScreen);
         registrar.playToClient(OpenDescriptiveBookScreenPayload.TYPE, OpenDescriptiveBookScreenPayload.STREAM_CODEC,
@@ -85,6 +86,8 @@ public final class ModNetworking {
                 ClientWritingDeskCatalog::handle);
         registrar.playToServer(SetBookBinderTitlePayload.TYPE, SetBookBinderTitlePayload.STREAM_CODEC,
                 ModNetworking::setBookBinderTitle);
+        registrar.playToServer(SetLinkModifierTitlePayload.TYPE, SetLinkModifierTitlePayload.STREAM_CODEC,
+                ModNetworking::setLinkModifierTitle);
     }
 
     private static void setBookBinderTitle(SetBookBinderTitlePayload payload, IPayloadContext context) {
@@ -95,6 +98,14 @@ public final class ModNetworking {
         }
     }
 
+    private static void setLinkModifierTitle(SetLinkModifierTitlePayload payload, IPayloadContext context) {
+        if (context.player() instanceof ServerPlayer player
+                && player.containerMenu instanceof LinkModifierMenu menu
+                && menu.containerId == payload.containerId()) {
+            menu.setTitle(player, payload.title());
+        }
+    }
+
     private static void requestDescriptiveBookScreen(RequestDescriptiveBookScreenPayload payload, IPayloadContext context) {
         if (!(context.player() instanceof ServerPlayer player)) {
             return;

src/main/java/net/dnorberg/rivencraft/network/SetLinkModifierTitlePayload.java

@@ -0,0 +1,19 @@
+package net.dnorberg.rivencraft.network;
+
+import net.dnorberg.rivencraft.Rivencraft;
+import net.minecraft.network.RegistryFriendlyByteBuf;
+import net.minecraft.network.codec.ByteBufCodecs;
+import net.minecraft.network.codec.StreamCodec;
+import net.minecraft.network.protocol.common.custom.CustomPacketPayload;
+import net.minecraft.resources.ResourceLocation;
+
+public record SetLinkModifierTitlePayload(int containerId, String title) implements CustomPacketPayload {
+    public static final Type<SetLinkModifierTitlePayload> TYPE = new Type<>(
+            ResourceLocation.fromNamespaceAndPath(Rivencraft.MOD_ID, "set_link_modifier_title"));
+    public static final StreamCodec<RegistryFriendlyByteBuf, SetLinkModifierTitlePayload> STREAM_CODEC =
+            StreamCodec.composite(ByteBufCodecs.VAR_INT, SetLinkModifierTitlePayload::containerId,
+                    ByteBufCodecs.STRING_UTF8, SetLinkModifierTitlePayload::title,
+                    SetLinkModifierTitlePayload::new);
+
+    @Override public Type<? extends CustomPacketPayload> type() { return TYPE; }
+}

src/main/java/net/dnorberg/rivencraft/registry/ModBlockEntities.java

@@ -5,6 +5,7 @@ import net.dnorberg.rivencraft.block.entity.BookStandBlockEntity;
 import net.dnorberg.rivencraft.block.entity.BookBinderBlockEntity;
 import net.dnorberg.rivencraft.block.entity.WritingDeskBlockEntity;
 import net.dnorberg.rivencraft.block.entity.InkMixerBlockEntity;
+import net.dnorberg.rivencraft.block.entity.LinkModifierBlockEntity;
 import net.dnorberg.rivencraft.block.entity.StarFissureBlockEntity;
 import net.dnorberg.rivencraft.block.entity.BookReceptacleBlockEntity;
 import net.dnorberg.rivencraft.block.entity.CrystalPortalBlockEntity;
@@ -31,6 +32,9 @@ public final class ModBlockEntities {
     public static final DeferredHolder<BlockEntityType<?>, BlockEntityType<InkMixerBlockEntity>> INK_MIXER =
             BLOCK_ENTITIES.register("ink_mixer", () -> BlockEntityType.Builder
                     .of(InkMixerBlockEntity::new, ModBlocks.INK_MIXER.get()).build(null));
+    public static final DeferredHolder<BlockEntityType<?>, BlockEntityType<LinkModifierBlockEntity>> LINK_MODIFIER =
+            BLOCK_ENTITIES.register("link_modifier", () -> BlockEntityType.Builder
+                    .of(LinkModifierBlockEntity::new, ModBlocks.LINK_MODIFIER.get()).build(null));
     public static final DeferredHolder<BlockEntityType<?>, BlockEntityType<StarFissureBlockEntity>> STAR_FISSURE =
             BLOCK_ENTITIES.register("star_fissure", () -> BlockEntityType.Builder
                     .of(StarFissureBlockEntity::new, ModBlocks.STAR_FISSURE.get()).build(null));

src/main/java/net/dnorberg/rivencraft/registry/ModBlocks.java

@@ -5,6 +5,7 @@ import net.dnorberg.rivencraft.block.BookStandBlock;
 import net.dnorberg.rivencraft.block.BookBinderBlock;
 import net.dnorberg.rivencraft.block.WritingDeskBlock;
 import net.dnorberg.rivencraft.block.InkMixerBlock;
+import net.dnorberg.rivencraft.block.LinkModifierBlock;
 import net.dnorberg.rivencraft.block.BuddingCrystalBlock;
 import net.dnorberg.rivencraft.block.StarFissureBlock;
 import net.dnorberg.rivencraft.block.DecayBlock;
@@ -40,6 +41,9 @@ public final class ModBlocks {
             "ink_mixer", InkMixerBlock::new,
             BlockBehaviour.Properties.ofFullCopy(Blocks.CRAFTING_TABLE).noOcclusion()
     );
+    public static final DeferredBlock<LinkModifierBlock> LINK_MODIFIER = BLOCKS.registerBlock(
+            "link_modifier", LinkModifierBlock::new,
+            BlockBehaviour.Properties.ofFullCopy(Blocks.CRAFTING_TABLE).noOcclusion());
     public static final DeferredBlock<Block> CRYSTAL_BLOCK = BLOCKS.registerBlock("crystal_block",
             Block::new, BlockBehaviour.Properties.ofFullCopy(Blocks.AMETHYST_BLOCK).mapColor(MapColor.COLOR_BLUE));
     public static final DeferredBlock<BookReceptacleBlock> BOOK_RECEPTACLE = BLOCKS.registerBlock("book_receptacle",

src/main/java/net/dnorberg/rivencraft/registry/ModCreativeTabs.java

@@ -27,9 +27,12 @@ public final class ModCreativeTabs {
                         output.accept(ModItems.DESCRIPTIVE_BOOK.get());
                         output.accept(ModItems.LINKING_BOOK.get());
                         output.accept(ModItems.NOTEBOOK.get());
+                        output.accept(ModItems.COLLATION_FOLDER.get());
+                        output.accept(ModItems.SEALED_NOTEBOOK.get());
                         output.accept(ModItems.INK_VIAL.get());
                         output.accept(ModItems.WRITING_DESK.get());
                         output.accept(ModItems.INK_MIXER.get());
+                        output.accept(ModItems.LINK_MODIFIER.get());
                         output.accept(ModItems.BOOK_BINDER.get());
                         output.accept(ModItems.CRYSTAL_BLOCK.get());
                         output.accept(ModItems.BOOK_RECEPTACLE.get());

src/main/java/net/dnorberg/rivencraft/registry/ModItems.java

@@ -5,6 +5,8 @@ import net.dnorberg.rivencraft.item.DescriptiveBookItem;
 import net.dnorberg.rivencraft.item.LinkingBookItem;
 import net.dnorberg.rivencraft.item.PageItem;
 import net.dnorberg.rivencraft.item.NotebookItem;
+import net.dnorberg.rivencraft.item.CollationFolderItem;
+import net.dnorberg.rivencraft.item.SealedNotebookItem;
 import net.dnorberg.rivencraft.item.InkVialItem;
 import net.minecraft.world.item.Item;
 import net.minecraft.world.item.BlockItem;
@@ -35,6 +37,10 @@ public final class ModItems {
             NotebookItem::new,
             new Item.Properties().stacksTo(1)
     );
+    public static final DeferredItem<CollationFolderItem> COLLATION_FOLDER = ITEMS.registerItem(
+            "collation_folder", CollationFolderItem::new, new Item.Properties().stacksTo(1));
+    public static final DeferredItem<SealedNotebookItem> SEALED_NOTEBOOK = ITEMS.registerItem(
+            "sealed_notebook", SealedNotebookItem::new, new Item.Properties().stacksTo(16));
     public static final DeferredItem<InkVialItem> INK_VIAL = ITEMS.registerItem(
             "ink_vial",
             InkVialItem::new,
@@ -43,6 +49,7 @@ public final class ModItems {
     public static final DeferredItem<BlockItem> WRITING_DESK = ITEMS.registerSimpleBlockItem(ModBlocks.WRITING_DESK);
     public static final DeferredItem<BlockItem> BOOK_BINDER = ITEMS.registerSimpleBlockItem(ModBlocks.BOOK_BINDER);
     public static final DeferredItem<BlockItem> INK_MIXER = ITEMS.registerSimpleBlockItem(ModBlocks.INK_MIXER);
+    public static final DeferredItem<BlockItem> LINK_MODIFIER = ITEMS.registerSimpleBlockItem(ModBlocks.LINK_MODIFIER);
     public static final DeferredItem<BlockItem> CRYSTAL_BLOCK = ITEMS.registerSimpleBlockItem(ModBlocks.CRYSTAL_BLOCK);
     public static final DeferredItem<BlockItem> BOOK_RECEPTACLE = ITEMS.registerSimpleBlockItem(ModBlocks.BOOK_RECEPTACLE);
     public static final DeferredItem<BlockItem> BUDDING_CRYSTAL = ITEMS.registerSimpleBlockItem(ModBlocks.BUDDING_CRYSTAL);

src/main/java/net/dnorberg/rivencraft/registry/ModMenus.java

@@ -5,6 +5,7 @@ import net.dnorberg.rivencraft.menu.NotebookMenu;
 import net.dnorberg.rivencraft.menu.WritingDeskMenu;
 import net.dnorberg.rivencraft.menu.BookBinderMenu;
 import net.dnorberg.rivencraft.menu.InkMixerMenu;
+import net.dnorberg.rivencraft.menu.LinkModifierMenu;
 import net.minecraft.core.registries.Registries;
 import net.minecraft.world.inventory.MenuType;
 import net.neoforged.bus.api.IEventBus;
@@ -24,6 +25,8 @@ public final class ModMenus {
             MENUS.register("book_binder", () -> IMenuTypeExtension.create(BookBinderMenu::new));
     public static final DeferredHolder<MenuType<?>, MenuType<InkMixerMenu>> INK_MIXER =
             MENUS.register("ink_mixer", () -> IMenuTypeExtension.create(InkMixerMenu::new));
+    public static final DeferredHolder<MenuType<?>, MenuType<LinkModifierMenu>> LINK_MODIFIER =
+            MENUS.register("link_modifier", () -> IMenuTypeExtension.create(LinkModifierMenu::new));
 
     private ModMenus() {
     }

src/main/java/net/dnorberg/rivencraft/writing/WritingDeskCatalog.java

@@ -9,6 +9,7 @@ import net.dnorberg.rivencraft.block.entity.WritingDeskBlockEntity;
 import net.dnorberg.rivencraft.item.PageItem;
 import net.dnorberg.rivencraft.registry.ModDataComponents;
 import net.dnorberg.rivencraft.registry.ModItems;
+import net.dnorberg.rivencraft.item.CollationFolderItem;
 import net.minecraft.network.RegistryFriendlyByteBuf;
 import net.minecraft.resources.ResourceLocation;
 import net.minecraft.world.item.ItemStack;
@@ -24,7 +25,7 @@ public final class WritingDeskCatalog {
         for (int slot = 0; slot < WritingDeskBlockEntity.COLLECTIONS; slot++) {
             ItemStack collection = desk.getItem(slot);
             if (collection.is(ModItems.PAGE.get())) add(unique, collection);
-            if (collection.is(ModItems.NOTEBOOK.get())) {
+            if (CollationFolderItem.isCollection(collection)) {
                 List<ItemStack> pages = collection.getOrDefault(
                         ModDataComponents.NOTEBOOK_CONTENTS.get(), NotebookContents.EMPTY).pages();
                 pages.forEach(page -> add(unique, page));

src/main/resources/assets/rivencraft/blockstates/link_modifier.json

@@ -0,0 +1,8 @@
+{
+  "variants": {
+    "facing=north": { "model": "rivencraft:block/link_modifier" },
+    "facing=east": { "model": "rivencraft:block/link_modifier", "y": 90 },
+    "facing=south": { "model": "rivencraft:block/link_modifier", "y": 180 },
+    "facing=west": { "model": "rivencraft:block/link_modifier", "y": 270 }
+  }
+}

src/main/resources/assets/rivencraft/lang/en_us.json

@@ -17,6 +17,18 @@
   "item.rivencraft.link_property.intra_linking": "Intra Linking",
   "item.rivencraft.page.unresolved": "Unresolved Symbol Page",
   "item.rivencraft.notebook": "Notebook",
+  "item.rivencraft.collation_folder": "Collation Folder",
+  "item.rivencraft.sealed_notebook": "Sealed Notebook",
+  "block.rivencraft.link_modifier": "Link Modifier",
+  "container.rivencraft.link_modifier": "Link Modifier",
+  "screen.rivencraft.link_modifier.title": "Book title",
+  "screen.rivencraft.link_modifier.retire": "Retire Age",
+  "screen.rivencraft.link_modifier.confirm": "Confirm!",
+  "message.rivencraft.link_modifier.delete.retired": "Age retired. Its terrain was archived outside the active world.",
+  "message.rivencraft.link_modifier.delete.already_dead": "This Age is already retired.",
+  "message.rivencraft.link_modifier.delete.occupied": "Cannot retire an Age while players are inside it.",
+  "message.rivencraft.link_modifier.delete.unload_failed": "Could not unload this Age; its data is unchanged.",
+  "message.rivencraft.link_modifier.delete.storage_failed": "Could not archive this Age's data; it was not retired.",
   "item.rivencraft.notebook.pages": "Pages: %s/%s",
   "item.rivencraft.notebook.unresolved": "Unresolved pages: %s",
   "item.rivencraft.ink_vial": "Ink Vial",

src/main/resources/assets/rivencraft/models/block/link_modifier.json

@@ -0,0 +1,120 @@
+{
+    "parent": "block/block",
+    "textures": {
+        "particle": "rivencraft:block/link_modifier_base",
+        "0": "rivencraft:block/link_modifier_base",
+        "1": "rivencraft:block/link_modifier_details"
+    },
+    "elements": [
+        {
+            "from": [ 0.0, 0.0, 0.0 ],
+            "to": [ 16.0, 12.0, 16.0 ],
+            "faces": {
+                "north": { "texture": "#0", "uv": [ 0.0, 4.0, 4.0, 7.0 ] },
+                "east": { "texture": "#0", "uv": [ 4.0, 4.0, 8.0, 7.0 ] },
+                "south": { "texture": "#0", "uv": [ 8.0, 4.0, 12.0, 7.0 ] },
+                "west": { "texture": "#0", "uv": [ 12.0, 4.0, 16.0, 7.0 ] },
+                "up": { "texture": "#0", "uv": [ 4.0, 0.0, 8.0, 4.0 ] },
+                "down": { "texture": "#0", "uv": [ 8.0, 0.0, 12.0, 4.0 ] }
+            }
+        },
+        {
+            "from": [ 1.5, 12.0, 11.0 ],
+            "to": [ 3.5, 13.0, 13.0 ],
+            "faces": {
+                "north": { "texture": "#1", "uv": [ 0.0, 15.0, 1.0, 15.5 ] },
+                "east": { "texture": "#1", "uv": [ 0.0, 14.0, 1.0, 14.5 ] },
+                "south": { "texture": "#1", "uv": [ 0.0, 13.0, 1.0, 13.5 ] },
+                "west": { "texture": "#1", "uv": [ 1.0, 13.0, 1.0, 13.5 ] },
+                "up": { "texture": "#1", "uv": [ 2.0, 14.0, 3.0, 15.0 ] },
+                "down": { "texture": "#1", "uv": [ 1.0, 13.0, 2.0, 14.0 ] }
+            }
+        },
+        {
+            "from": [ 3.7, 12.0, 11.0 ],
+            "to": [ 5.7, 13.0, 13.0 ],
+            "faces": {
+                "north": { "texture": "#1", "uv": [ 0.0, 15.0, 1.0, 15.5 ] },
+                "east": { "texture": "#1", "uv": [ 0.0, 14.0, 1.0, 14.5 ] },
+                "south": { "texture": "#1", "uv": [ 0.0, 13.0, 1.0, 13.5 ] },
+                "west": { "texture": "#1", "uv": [ 1.0, 13.0, 1.0, 13.5 ] },
+                "up": { "texture": "#1", "uv": [ 2.0, 14.0, 3.0, 15.0 ] },
+                "down": { "texture": "#1", "uv": [ 1.0, 13.0, 2.0, 14.0 ] }
+            }
+        },
+        {
+            "from": [ 5.9, 12.0, 11.0 ],
+            "to": [ 7.9, 13.0, 13.0 ],
+            "faces": {
+                "north": { "texture": "#1", "uv": [ 0.0, 15.0, 1.0, 15.5 ] },
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+            }
+        },
+        {
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+            "to": [ 10.1, 13.0, 13.0 ],
+            "faces": {
+                "north": { "texture": "#1", "uv": [ 0.0, 15.0, 1.0, 15.5 ] },
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+        },
+        {
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+            "to": [ 12.3, 13.0, 13.0 ],
+            "faces": {
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+                "down": { "texture": "#1", "uv": [ 1.0, 13.0, 2.0, 14.0 ] }
+            }
+        },
+        {
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+            "to": [ 14.5, 13.0, 13.0 ],
+            "faces": {
+                "north": { "texture": "#1", "uv": [ 0.0, 15.0, 1.0, 15.5 ] },
+                "east": { "texture": "#1", "uv": [ 0.0, 14.0, 1.0, 14.5 ] },
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+                "down": { "texture": "#1", "uv": [ 1.0, 13.0, 2.0, 14.0 ] }
+            }
+        },
+        {
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+            "to": [ 14.0, 12.4, 8.0 ],
+            "rotation": { "origin": [ 8.0, 8.0, 8.0 ], "axis": "x", "angle": 22.5 },
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+                "down": { "texture": "#1", "uv": [ 6.0, 0.0, 12.0, 3.5 ] }
+            }
+        },
+        {
+            "from": [ 4.0, 11.5, 3.5 ],
+            "to": [ 12.0, 15.5, 5.5 ],
+            "rotation": { "origin": [ 8.0, 8.0, 8.0 ], "axis": "x", "angle": 22.5 },
+            "faces": {
+                "north": { "texture": "#1", "uv": [ 1.0, 9.0, 5.0, 11.0 ] },
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+                "down": { "texture": "#1", "uv": [ 5.0, 8.0, 9.0, 9.0 ] }
+            }
+        }
+    ]
+}

src/main/resources/assets/rivencraft/models/item/collation_folder.json

@@ -0,0 +1,4 @@
+{
+  "parent": "minecraft:item/generated",
+  "textures": { "layer0": "rivencraft:item/collation_folder" }
+}

src/main/resources/assets/rivencraft/models/item/link_modifier.json

@@ -0,0 +1 @@
+{ "parent": "rivencraft:block/link_modifier" }

src/main/resources/assets/rivencraft/models/item/sealed_notebook.json

@@ -0,0 +1,4 @@
+{
+  "parent": "minecraft:item/generated",
+  "textures": { "layer0": "rivencraft:item/sealed_notebook" }
+}

src/main/resources/data/rivencraft/loot_table/blocks/link_modifier.json

@@ -0,0 +1,4 @@
+{
+  "type": "minecraft:block",
+  "pools": [{ "rolls": 1, "entries": [{ "type": "minecraft:item", "name": "rivencraft:link_modifier" }] }]
+}

src/main/resources/data/rivencraft/loot_table/chests/mystcraft_library.json

@@ -9,7 +9,7 @@
         { "type": "minecraft:item", "name": "minecraft:leather", "weight": 5,
           "functions": [{ "function": "minecraft:set_count", "count": { "type": "minecraft:uniform", "min": 1, "max": 3 } }] },
         { "type": "minecraft:item", "name": "rivencraft:ink_vial", "weight": 4 },
-        { "type": "minecraft:item", "name": "minecraft:book", "weight": 3 },
+        { "type": "minecraft:item", "name": "rivencraft:sealed_notebook", "weight": 20 },
         { "type": "minecraft:item", "name": "minecraft:experience_bottle", "weight": 1 }
       ]
     },
@@ -17,7 +17,7 @@
       "rolls": { "type": "minecraft:uniform", "min": 1, "max": 2 },
       "entries": [
         { "type": "minecraft:item", "name": "rivencraft:ink_vial", "weight": 3 },
-        { "type": "minecraft:item", "name": "minecraft:book", "weight": 2 },
+        { "type": "minecraft:item", "name": "rivencraft:sealed_notebook", "weight": 2 },
         { "type": "minecraft:item", "name": "minecraft:experience_bottle", "weight": 1 }
       ]
     }