fix(xp): prioritize repairing equipped mending items before giving leftover xp to player

Specifies what counts as "tested" for this repo, the local test
commands the bot treats as gates, and how pragent reads the repo
config (`.pr-review.json` + static architecture.md from Nexus
raw-hosted).

.gitea/pull_request_template.md

@@ -0,0 +1,53 @@
+## What
+
+<!-- 1-2 sentences. What does this PR change? -->
+
+## Why
+
+<!-- Link the issue, design doc, or chat thread. Without a "why" the reviewer
+has to guess whether the change is wanted at all. -->
+
+Refs: #<!-- issue or N/A -->
+
+## How to test
+
+```bash
+# Commands the reviewer can run to reproduce / verify:
+docker run --rm -v "$PWD":/work -v "$HOME/.m2":/root/.m2 -w /work \
+  maven:3.9-eclipse-temurin-25 mvn -B test
+```
+
+<!-- Manual test steps (if any): load a save, join a server, trigger a
+death in the void, etc. State what you observed. -->
+
+<!-- Server console output if relevant (translatable components render
+in English there — that's normal). -->
+
+## Risk
+
+<!-- Which surface is touched? chat-only / item-loss / chunk-load / permissions.
+Is a rollback plan needed? Does it need a config.yml default? -->
+
+- [ ] chat message flow (immutable after send)
+- [ ] pt-BR singular-form rule (`5.966 blocos de Pedra`, not `5.966 Pedras`)
+- [ ] Bedrock equivalent (`comando:` typed fallback, `texto:` ASCII label)
+- [ ] stats path (`<world>/players/stats`, not `<world>/stats`)
+- [ ] reaction late-window (`reacao-validade-minutos`)
+- [ ] Bukkit main thread (no async chunk loads in event handlers)
+- [ ] new `comando:` added to `plugin.yml`
+- [ ] new permission declared in `plugin.yml`
+
+## Checklist
+
+- [ ] `mvn -B test` passes locally (JDK 25)
+- [ ] new behaviour has a test (`src/test/java/...`)
+- [ ] no hand edits to generated sources (none in this repo)
+- [ ] PR title is conventional-commit style
+- [ ] branch is up to date with `main`
+
+## AI review
+
+Label this PR **`AI-REVIEW`** to trigger `pragent`. Add **`AI-USAGE`** for a
+token/cost report on the review. The bot reads `.pr-review.json` from `main`
++ a static `architecture.md` from Nexus raw-hosted — so house rules (chat
+immutability, singular-form, Bedrock fallback, JDK 25) are baked in.

.pr-review.json

@@ -1,21 +1,30 @@
 {
-  "languages": [
-    "java",
-    "yaml",
-    "markdown"
-  ],
   "focus": [
-    "thread-safety",
-    "paper-chunk-ticketing",
-    "item-loss-prevention",
-    "resource-cleanup",
-    "performance-and-chunk-loading",
-    "null-safety-and-unit-tests"
+    "correctness",
+    "security",
+    "performance"
   ],
   "exclude_paths": [
     "target/**",
-    "*.bak*",
-    "docs/**"
+    "*.class"
   ],
-  "instructions": "Canalhandia is a Minecraft Paper 1.21.x server plugin written in modern Java 25. Enforce these core invariants:\n1. Thread Safety: Bukkit API, World, Entity, and Inventory mutations MUST run on the main server thread. Async threads only do pure calculation or async file I/O.\n2. Item & Inventory Safety: Never discard player items. Always handle full-inventory overflow by dropping excess items at the player's location. On multi-step container placement (e.g. chests), roll back blocks if not all items fit.\n3. Lifecycle & Cleanup: All registered chunk tickets, recipes, schedulers, and I/O executors must be cleanly flushed and unloaded in onDisable() and module toggles.\n4. Chunk Loading: Never trigger synchronous chunk generation or loading inside event handlers. Always check world.isChunkLoaded() before querying blocks.\n5. Test Coverage: All domain logic, coordinates math, parsers, and pure helpers must have corresponding JUnit tests in src/test/java."
+  "languages": [
+    "java"
+  ],
+  "style": "balanced",
+  "require_tests": true,
+  "exclude_tests": false,
+  "max_findings": 15,
+  "severity_threshold": "low",
+  "patterns": {
+    "deny": [
+      "**/README.md",
+      "**/*.md"
+    ]
+  },
+  "cost_target": "claude-sonnet-5",
+  "additional_context_urls": [
+    "http://nexus-service.nexus.svc.cluster.local:8081/repository/raw-hosted/canalhandia/architecture.md"
+  ],
+  "instructions": "Minecraft plugin (Paper 26.2, pt-BR, JDK 25 build). Chat-only — never touch gameplay. Watch thread-safety on event handlers (PlayerDeathEvent, PlayerInteractEvent) — the Bukkit main thread is single-threaded but async chunks/events cross it. Avoid main-thread I/O; defer expensive scans (chunk loading, spiral search) to scheduled tasks or async paths. Flag mutable shared state across listener invocations. Hard constraints: chat messages are immutable after send (counts baked into buttons freeze at send time); names go out as translatable components so the singular-form rule applies (number never agrees with the noun); Geyser/Bedrock cannot click and cannot show emoji (every click has a typed fallback); vanilla statistics are the only data source (offline path is <world>/players/stats/<uuid>.json, NOT <world>/stats); reactions keep counting late (reacao-validade-minutos); Floodgate is optional runtime dep. Flag: real bugs, missing persistence of new settings, comando/permission not in plugin.yml, breaking Bedrock equivalent invariant, removing the frozen-at-send assumption, violating singular-form rule, missing Stats.resolve() on renames."
 }

CONTRIBUTING.md

@@ -0,0 +1,93 @@
+# Contributing — Canalhandia (Canalhandia Minecraft plugin)
+
+Canalhandia is a Minecraft Paper plugin that adds PT-BR chat games, item
+protection, and other in-game commands for the Canalhandia server. This repo
+holds the plugin source. The companion server config lives at
+`gitea_admin/canalhandia-config`.
+
+## Before you open a PR
+
+1. **Fill in the PR template** (`.gitea/pull_request_template.md`). The
+   *Risk* checklist is the part pragent scores you on — check the boxes that
+   apply, delete the ones that don't.
+2. **Update the static context** if your change introduces new house rules.
+   See `## Adding house rules` below.
+3. **Run the gates locally** (see *Test commands*). CI is a single
+   `mvn -B test` against JDK 25 — there's no other infra in this repo.
+
+## Test commands
+
+```bash
+# Run the test suite (JDK 25 required). Same command CI uses:
+mvn -B test
+
+# Compile only (faster):
+mvn -B -DskipTests package
+
+# Integration: copy the resulting jar into a test Paper server's plugins/
+# directory, start the server, exercise the affected commands. The chat
+# and stats paths are NOT covered by unit tests — they need a live server.
+```
+
+### What counts as "tested"
+
+For pragent (and reviewers) to consider a change tested, the PR must show:
+
+- [ ] `mvn -B test` output from your machine pasted in the PR, **OR** a CI
+      run URL.
+- [ ] A new behaviour has a JUnit test in `src/test/java/...` that exercises
+      the new code path. New `comando:` blocks need at least one test that
+      sends a fake event and asserts the message format.
+- [ ] If the change touches the chat immutability rule, the singular-form
+      rule, or the Bedrock fallback, a manual test on a Paper server is
+      required **and** a one-line note pasted in the PR.
+- [ ] If the change touches `<world>/players/stats`, you must show the
+      file path on a running server (`ls <world>/players/stats/*.json`)
+      and confirm the stats file is updated, not the wrong path.
+
+### Out of scope for tests
+
+- Performance / load tests (none in this repo).
+- E2E against the live server (manual; verify in `canalhandia-config` repo).
+- UI / browser tests (no web surface).
+
+## Commit messages
+
+Conventional commits. Examples:
+
+- `feat: add per-player cobblestone counter command`
+- `fix(void): keep inventory when dying in lava void`
+- `docs: update README build instructions`
+- `chore: bump pom parent to 1.4.2`
+
+## Branch names
+
+`<type>/<short-kebab-description>` matching commit type. Example:
+`fix/void-keep-inventory`.
+
+## PR review
+
+- The bot (`pragent`) reviews every PR labelled `AI-REVIEW`. It reads
+  `.pr-review.json` from `main` + the static `architecture.md` from Nexus
+  raw-hosted. Adding a new house rule? Update both.
+- Add the `AI-USAGE` label if you want the bot to also post a token /
+  cost-equivalent report on the review.
+
+## Adding house rules
+
+If your PR changes how translatable components behave, how chat edits work,
+how stats are read, or how the Bedrock fallback is rendered, you must:
+
+1. Update the relevant section in the static `architecture.md` (upload a new
+   copy to Nexus raw-hosted at `canalhandia/architecture.md`).
+2. Bump `.pr-review.json:instructions` with a one-paragraph summary.
+3. Add a finding-checklist item to `.gitea/pull_request_template.md` *Risk*
+   section so PR authors know to confirm the rule.
+
+Bot does not detect house-rule drift automatically — these three updates
+together are the maintainer contract.
+
+## Rollback
+
+A single PR that bumps the plugin jar in `canalhandia-config` rolls back.
+Plugins are jar-swapped, no migrations.

src/main/java/dev/marcospaulo/canalhandia/Canalhandia.java

@@ -161,6 +161,7 @@ public final class Canalhandia extends JavaPlugin implements Listener {
         getServer().getPluginManager().registerEvents(this, this);
         getServer().getPluginManager().registerEvents(new TitleChatListener(this), this);
         getServer().getPluginManager().registerEvents(new ChunkLoaderListener(this), this);
+        getServer().getPluginManager().registerEvents(new XpAndItemMergeListener(this), this);
         rescheduleTimer();
         rescheduleMilestones();
 

src/main/java/dev/marcospaulo/canalhandia/CanalhandiaCommand.java

@@ -1530,8 +1530,10 @@ final class CanalhandiaCommand implements CommandExecutor, TabCompleter {
             }
             return true;
         }
-        String arg = String.join(" ", args);
-        if (arg.equalsIgnoreCase("limpar") || arg.equalsIgnoreCase("nenhum")) {
+        String arg = String.join(" ", args).trim();
+        if (arg.equalsIgnoreCase("limpar") || arg.equalsIgnoreCase("nenhum")
+                || arg.equalsIgnoreCase("remover") || arg.equalsIgnoreCase("remove")
+                || arg.equalsIgnoreCase("clear")) {
             plugin.titles().clear(player.getUniqueId());
             Msg.ok(player, Lang.tr("canalhandia.cmd.titulo.removido"));
             return true;
@@ -1546,20 +1548,37 @@ final class CanalhandiaCommand implements CommandExecutor, TabCompleter {
         return true;
     }
 
-    /** Matches typed text to an earned achievement by key or (case-insensitive) title. */
+    /** Matches typed text to an earned achievement by key, title, or accent-normalized text. */
     static Achievement matchEarned(String text, List<Achievement> earned) {
-        Achievement byKey = Achievement.byKey(text);
+        if (text == null || text.isBlank() || earned == null || earned.isEmpty()) {
+            return null;
+        }
+        String clean = text.trim();
+        Achievement byKey = Achievement.byKey(clean);
         if (byKey != null && earned.contains(byKey)) {
             return byKey;
         }
         for (Achievement achievement : earned) {
-            if (achievement.title().equalsIgnoreCase(text.trim())) {
+            if (achievement.title().equalsIgnoreCase(clean)) {
+                return achievement;
+            }
+        }
+        String normalizedClean = normalizeText(clean);
+        for (Achievement achievement : earned) {
+            if (normalizeText(achievement.title()).equalsIgnoreCase(normalizedClean)
+                    || normalizeText(achievement.key()).equalsIgnoreCase(normalizedClean)) {
                 return achievement;
             }
         }
         return null;
     }
 
+    private static String normalizeText(String input) {
+        if (input == null) return "";
+        return java.text.Normalizer.normalize(input, java.text.Normalizer.Form.NFD)
+                .replaceAll("\\p{M}", "");
+    }
+
     private static String titlesList(List<Achievement> earned) {
         List<String> names = new ArrayList<>();
         for (Achievement achievement : earned) {
@@ -1975,6 +1994,10 @@ final class CanalhandiaCommand implements CommandExecutor, TabCompleter {
             Msg.error(sender, "A âncora " + loader.displayName() + " já está " + (enabled ? "ativa" : "pausada") + ".");
             return;
         }
+        if (enabled && loader.isExpired()) {
+            Msg.error(sender, "A âncora " + loader.displayName() + " está expirada! Adicione tempo (/chunkloader tempo " + loader.id() + " <horas>) ou abasteça com combustível antes de reativar.");
+            return;
+        }
         plugin.chunkLoaders().setEnabled(loader.id(), enabled);
         plugin.blueMap().syncChunkLoaders();
         Msg.ok(sender, "Âncora " + loader.displayName() + " " + (enabled ? "ATIVADA." : "PAUSADA/DESATIVADA."));
@@ -1998,16 +2021,20 @@ final class CanalhandiaCommand implements CommandExecutor, TabCompleter {
         }
         try {
             double hours = Double.parseDouble(args[1]);
-            if (hours <= 0 && isAdmin) {
-                plugin.chunkLoaders().addTime(loader.id(), -loader.expiresAt()); // permanent
+            if (hours <= 0) {
+                if (isAdmin) {
+                    plugin.chunkLoaders().setExpiresAt(loader.id(), 0L); // permanent
                     Msg.ok(sender, "Âncora " + loader.displayName() + " definida como PERMANENTE.");
                 } else {
+                    Msg.error(sender, "A quantidade de horas deve ser maior que zero.");
+                }
+                return;
+            }
             long millis = (long) (hours * 3600_000L);
             plugin.chunkLoaders().addTime(loader.id(), millis);
             ChunkLoader updated = plugin.chunkLoaders().byId(loader.id());
             String time = (updated != null) ? updated.timeLeft() : "Permanente";
             Msg.ok(sender, "Adicionado " + hours + "h à âncora " + loader.displayName() + ". Tempo restante: " + time);
-            }
             plugin.blueMap().syncChunkLoaders();
         } catch (NumberFormatException e) {
             Msg.error(sender, "Horas inválidas: " + args[1]);

src/main/java/dev/marcospaulo/canalhandia/ChunkLoaderListener.java

@@ -209,6 +209,10 @@ final class ChunkLoaderListener implements Listener {
             }
 
             if (player.isSneaking() && (isOwner || isAdmin)) {
+                if (!loader.enabled() && loader.isExpired()) {
+                    Msg.error(player, "A âncora " + loader.displayName() + " está expirada! Clique com combustível (Pérola do End, Blaze, Diamante, etc.) ou adicione tempo antes de reativar.");
+                    return;
+                }
                 boolean newState = !loader.enabled();
                 plugin.chunkLoaders().setEnabled(loader.id(), newState);
                 Location l = block.getLocation().add(0.5, 0.5, 0.5);

src/main/java/dev/marcospaulo/canalhandia/ChunkLoaders.java

@@ -36,7 +36,7 @@ final class ChunkLoaders {
 
     private static final String PERM_LIMIT_PREFIX = "canalhandia.chunkloader.limite.";
 
-    private final Plugin plugin;
+    private final Canalhandia plugin;
     private final File file;
     private final List<ChunkLoader> loaders = new ArrayList<>();
     private final AtomicLong nextId = new AtomicLong(1);
@@ -48,7 +48,7 @@ final class ChunkLoaders {
         return t;
     });
 
-    ChunkLoaders(Plugin plugin, File file) {
+    ChunkLoaders(Canalhandia plugin, File file) {
         this.plugin = plugin;
         this.file = file;
         load();
@@ -97,11 +97,21 @@ final class ChunkLoaders {
      * Registers a new chunk loader and activates the ticket in the world.
      */
     ChunkLoader add(String ownerUuid, String ownerName, String world, int x, int y, int z) {
-        return add(ownerUuid, ownerName, world, x, y, z, "", 0L);
+        return add(ownerUuid, ownerName, world, x, y, z, "", defaultInitialExpiration());
     }
 
     ChunkLoader add(String ownerUuid, String ownerName, String world, int x, int y, int z, String name) {
-        return add(ownerUuid, ownerName, world, x, y, z, name, 0L);
+        return add(ownerUuid, ownerName, world, x, y, z, name, defaultInitialExpiration());
+    }
+
+    private long defaultInitialExpiration() {
+        if (plugin != null && plugin.settings() != null && plugin.settings().chunkLoaderRequiresTime()) {
+            double hours = plugin.settings().chunkLoaderInitialHours();
+            if (hours > 0) {
+                return System.currentTimeMillis() + (long) (hours * 3600_000L);
+            }
+        }
+        return 0L;
     }
 
     ChunkLoader add(String ownerUuid, String ownerName, String world, int x, int y, int z, String name, long expiresAt) {
@@ -144,6 +154,29 @@ final class ChunkLoaders {
         return false;
     }
 
+    /**
+     * Sets a specific expiration timestamp (or 0 for permanent) for a chunk loader.
+     */
+    boolean setExpiresAt(long id, long expiresAt) {
+        ChunkLoader updated = null;
+        synchronized (loaders) {
+            for (int i = 0; i < loaders.size(); i++) {
+                ChunkLoader curr = loaders.get(i);
+                if (curr.id() == id) {
+                    updated = curr.withExpiresAt(expiresAt).withEnabled(true);
+                    loaders.set(i, updated);
+                    break;
+                }
+            }
+        }
+        if (updated != null) {
+            addTicket(updated);
+            save();
+            return true;
+        }
+        return false;
+    }
+
     /**
      * Renames an existing chunk loader.
      */
@@ -191,21 +224,24 @@ final class ChunkLoaders {
     }
 
     /**
-     * Finds a chunk loader by its numeric ID (with or without '#') or custom name.
+     * Finds a chunk loader by its numeric ID (with '#' prefix or plain ID) or custom name.
+     * Custom names take precedence over raw numeric IDs to avoid shadowing named loaders.
      */
     ChunkLoader find(String query) {
         if (query == null || query.isBlank()) {
             return null;
         }
         String trimmed = query.trim();
+        if (trimmed.startsWith("#")) {
             try {
-            long id = Long.parseLong(trimmed.startsWith("#") ? trimmed.substring(1) : trimmed);
+                long id = Long.parseLong(trimmed.substring(1));
                 ChunkLoader loader = byId(id);
                 if (loader != null) {
                     return loader;
                 }
             } catch (NumberFormatException ignored) {
             }
+        }
 
         synchronized (loaders) {
             for (ChunkLoader loader : loaders) {
@@ -214,6 +250,15 @@ final class ChunkLoaders {
                 }
             }
         }
+
+        try {
+            long id = Long.parseLong(trimmed);
+            ChunkLoader loader = byId(id);
+            if (loader != null) {
+                return loader;
+            }
+        } catch (NumberFormatException ignored) {
+        }
         return null;
     }
 
@@ -382,7 +427,12 @@ final class ChunkLoaders {
                 }
                 Chunk chunk = w.getChunkAt(loader.chunkX(), loader.chunkZ());
 
-                // 1. Keep mob spawners (dungeon / blaze / skeleton cages) active
+                boolean spawnersActive = plugin.settings() == null || plugin.settings().chunkLoaderSpawnersActive();
+                boolean monsterSpawning = plugin.settings() == null || plugin.settings().chunkLoaderMonsterSpawning();
+                int monsterCap = plugin.settings() != null ? plugin.settings().chunkLoaderMonsterCap() : 20;
+
+                // 1. Keep mob spawners (dungeon / blaze / skeleton cages) active if enabled
+                if (spawnersActive) {
                     for (BlockState state : chunk.getTileEntities()) {
                         if (state instanceof CreatureSpawner spawner) {
                             if (spawner.getRequiredPlayerRange() < 1024) {
@@ -391,19 +441,20 @@ final class ChunkLoaders {
                             }
                         }
                     }
+                }
 
-                // 2. Simulate natural mob spawning (dark platforms / slime / nether farms)
+                // 2. Simulate natural mob spawning (dark platforms / slime / nether farms) if enabled
+                if (monsterSpawning) {
                     long mobCount = 0;
                     for (Entity entity : chunk.getEntities()) {
                         if (entity instanceof Mob) {
                             mobCount++;
                         }
                     }
-                if (mobCount >= 20) {
-                    continue; // Respect chunk mob cap
-                }
-
+                    if (mobCount < monsterCap) {
                         simulateNaturalSpawning(w, loader, chunk);
+                    }
+                }
             } catch (Exception ignored) {
             }
         }
@@ -414,7 +465,7 @@ final class ChunkLoaders {
         int baseZ = loader.chunkZ() << 4;
         ThreadLocalRandom rnd = ThreadLocalRandom.current();
 
-        for (int i = 0; i < 2; i++) {
+        for (int i = 0; i < 4; i++) {
             int rx = baseX + rnd.nextInt(16);
             int rz = baseZ + rnd.nextInt(16);
             int topY = Math.max(w.getMinHeight() + 2, Math.min(w.getMaxHeight() - 2, loader.y() + rnd.nextInt(-24, 25)));
@@ -423,15 +474,30 @@ final class ChunkLoaders {
             Block space = w.getBlockAt(rx, topY, rz);
             Block spaceAbove = w.getBlockAt(rx, topY + 1, rz);
 
-            if (!ground.getType().isSolid() || !space.getType().isAir() || !spaceAbove.getType().isAir()) {
+            if (!ground.getType().isSolid() || ground.isLiquid() || ground.getType() == Material.LAVA || ground.getType() == Material.WATER) {
                 continue;
             }
-            if (ground.isLiquid() || ground.getType() == Material.LAVA || ground.getType() == Material.WATER) {
+            if (!space.getType().isAir()) {
+                continue;
+            }
+
+            boolean isAirAbove = spaceAbove.getType().isAir();
+            boolean isTrapdoorAbove = isTrapdoor(spaceAbove.getType());
+            if (!isAirAbove && !isTrapdoorAbove) {
                 continue;
             }
 
             int light = space.getLightLevel();
-            EntityType toSpawn = pickEntityType(w, space, light);
+            EntityType toSpawn;
+            if (isTrapdoorAbove) {
+                if (light > 0) {
+                    continue;
+                }
+                toSpawn = EntityType.CREEPER;
+            } else {
+                toSpawn = pickEntityType(w, space, light);
+            }
+
             if (toSpawn == null) {
                 continue;
             }
@@ -446,16 +512,27 @@ final class ChunkLoaders {
         }
     }
 
-    static EntityType pickEntityType(World w, Block space, int light) {
-        World.Environment env = w.getEnvironment();
-        ThreadLocalRandom rnd = ThreadLocalRandom.current();
+    static boolean isTrapdoor(Material mat) {
+        if (mat == null) return false;
+        return mat.name().endsWith("_TRAPDOOR");
+    }
 
+    static EntityType pickEntityType(World w, Block space, int light) {
+        boolean isSlime = false;
+        try {
+            isSlime = space.getChunk().isSlimeChunk();
+        } catch (Exception ignored) {
+        }
+        return pickEntityType(w.getEnvironment(), isSlime, space.getY(), light, ThreadLocalRandom.current().nextInt(100));
+    }
+
+    static EntityType pickEntityType(World.Environment env, boolean isSlimeChunk, int y, int light, int roll) {
         if (env == World.Environment.NETHER) {
             if (light > 11) return null;
-            int roll = rnd.nextInt(100);
-            if (roll < 45) return EntityType.ZOMBIFIED_PIGLIN;
-            if (roll < 65) return EntityType.WITHER_SKELETON;
-            if (roll < 85) return EntityType.BLAZE;
+            int r = Math.floorMod(roll, 100);
+            if (r < 45) return EntityType.ZOMBIFIED_PIGLIN;
+            if (r < 65) return EntityType.WITHER_SKELETON;
+            if (r < 85) return EntityType.BLAZE;
             return EntityType.MAGMA_CUBE;
         }
 
@@ -463,8 +540,7 @@ final class ChunkLoaders {
             return EntityType.ENDERMAN;
         }
 
-        boolean isSlimeChunk = space.getChunk().isSlimeChunk() && space.getY() < 40;
-        if (isSlimeChunk && light <= 7 && rnd.nextInt(3) == 0) {
+        if (isSlimeChunk && y < 40 && light <= 7 && roll % 3 == 0) {
             return EntityType.SLIME;
         }
 
@@ -472,11 +548,11 @@ final class ChunkLoaders {
             return null;
         }
 
-        int roll = rnd.nextInt(100);
-        if (roll < 35) return EntityType.ZOMBIE;
-        if (roll < 65) return EntityType.SKELETON;
-        if (roll < 85) return EntityType.CREEPER;
-        if (roll < 95) return EntityType.SPIDER;
+        int r = Math.floorMod(roll, 100);
+        if (r < 35) return EntityType.ZOMBIE;
+        if (r < 65) return EntityType.SKELETON;
+        if (r < 85) return EntityType.CREEPER;
+        if (r < 95) return EntityType.SPIDER;
         return EntityType.WITCH;
     }
 
@@ -503,6 +579,15 @@ final class ChunkLoaders {
             if (w != null) {
                 w.removePluginChunkTicket(loader.chunkX(), loader.chunkZ(), plugin);
                 w.setChunkForceLoaded(loader.chunkX(), loader.chunkZ(), false);
+                if (w.isChunkLoaded(loader.chunkX(), loader.chunkZ())) {
+                    Chunk chunk = w.getChunkAt(loader.chunkX(), loader.chunkZ());
+                    for (BlockState state : chunk.getTileEntities()) {
+                        if (state instanceof CreatureSpawner spawner && spawner.getRequiredPlayerRange() > 16) {
+                            spawner.setRequiredPlayerRange(16);
+                            spawner.update(true, false);
+                        }
+                    }
+                }
             }
         } catch (Exception ignored) {
         }

src/main/java/dev/marcospaulo/canalhandia/Settings.java

@@ -597,6 +597,54 @@ final class Settings {
         set("chunkloader.bluemap", enabled);
     }
 
+    boolean chunkLoaderSpawnersActive() {
+        return plugin.getConfig().getBoolean("chunkloader.simulacao.gaiolas-ativas", true);
+    }
+
+    void chunkLoaderSpawnersActive(boolean active) {
+        set("chunkloader.simulacao.gaiolas-ativas", active);
+    }
+
+    boolean chunkLoaderMonsterSpawning() {
+        return plugin.getConfig().getBoolean("chunkloader.simulacao.spawn-monstros", true);
+    }
+
+    void chunkLoaderMonsterSpawning(boolean spawning) {
+        set("chunkloader.simulacao.spawn-monstros", spawning);
+    }
+
+    int chunkLoaderMonsterCap() {
+        return Math.max(1, plugin.getConfig().getInt("chunkloader.simulacao.limite-monstros-chunk", 20));
+    }
+
+    void chunkLoaderMonsterCap(int cap) {
+        set("chunkloader.simulacao.limite-monstros-chunk", Math.max(1, cap));
+    }
+
+    boolean chunkLoaderPassiveEntities() {
+        return plugin.getConfig().getBoolean("chunkloader.simulacao.tick-entidades-passivas", true);
+    }
+
+    void chunkLoaderPassiveEntities(boolean active) {
+        set("chunkloader.simulacao.tick-entidades-passivas", active);
+    }
+
+    boolean chunkLoaderRequiresTime() {
+        return plugin.getConfig().getBoolean("chunkloader.combustivel.requer-tempo", true);
+    }
+
+    void chunkLoaderRequiresTime(boolean required) {
+        set("chunkloader.combustivel.requer-tempo", required);
+    }
+
+    double chunkLoaderInitialHours() {
+        return Math.max(0.0, plugin.getConfig().getDouble("chunkloader.combustivel.tempo-inicial-horas", 24.0));
+    }
+
+    void chunkLoaderInitialHours(double hours) {
+        set("chunkloader.combustivel.tempo-inicial-horas", Math.max(0.0, hours));
+    }
+
     // --- salvavoid ----------------------------------------------------------
 
     int voidProtectionRadius() {

src/main/java/dev/marcospaulo/canalhandia/VoidProtection.java

@@ -108,27 +108,63 @@ public final class VoidProtection {
     }
 
     static boolean isSafeGround(Block block) {
-        if (block == null) {
+        return block != null && isSafeGroundMaterial(block.getType());
+    }
+
+    public static boolean isSafeGroundMaterial(Material mat) {
+        if (mat == null || mat == Material.AIR || mat == Material.CAVE_AIR || mat == Material.VOID_AIR) {
             return false;
         }
-        Material mat = block.getType();
-        if (mat.isAir() || !mat.isSolid()) {
+        if (mat == Material.LAVA || mat == Material.WATER || mat == Material.FIRE || mat == Material.SOUL_FIRE
+                || mat == Material.CACTUS || mat == Material.MAGMA_BLOCK || mat == Material.SWEET_BERRY_BUSH
+                || mat == Material.WITHER_ROSE || mat == Material.POWDER_SNOW) {
             return false;
         }
-        return mat != Material.LAVA && mat != Material.FIRE && mat != Material.SOUL_FIRE
-                && mat != Material.CACTUS && mat != Material.MAGMA_BLOCK && mat != Material.SWEET_BERRY_BUSH
-                && mat != Material.WITHER_ROSE && mat != Material.POWDER_SNOW;
+        try {
+            return mat.isSolid();
+        } catch (Exception | LinkageError e) {
+            return true;
+        }
     }
 
     static boolean isReplaceable(Block block) {
-        if (block == null) {
+        return block != null && isReplaceableMaterial(block.getType());
+    }
+
+    public static boolean isReplaceableMaterial(Material mat) {
+        if (mat == null) {
             return false;
         }
-        Material mat = block.getType();
-        return mat.isAir() || mat == Material.SHORT_GRASS || mat == Material.TALL_GRASS
+        return mat == Material.AIR || mat == Material.CAVE_AIR || mat == Material.VOID_AIR
+                || mat == Material.SHORT_GRASS || mat == Material.TALL_GRASS
                 || mat == Material.SNOW || mat == Material.FERN || mat == Material.LARGE_FERN;
     }
 
+    /**
+     * Calculates the estimated number of inventory slots needed to store the given items.
+     */
+    public static int calculateRequiredSlots(List<ItemStack> items) {
+        if (items == null || items.isEmpty()) {
+            return 0;
+        }
+        int slots = 0;
+        for (ItemStack item : items) {
+            if (item != null && item.getType() != Material.AIR && item.getAmount() > 0) {
+                int maxStack = Math.max(1, item.getMaxStackSize());
+                slots += (int) Math.ceil((double) item.getAmount() / maxStack);
+            }
+        }
+        return slots;
+    }
+
+    public static boolean canFitInSingleChest(List<ItemStack> items) {
+        return calculateRequiredSlots(items) <= 27;
+    }
+
+    public static boolean canFitInDoubleChest(List<ItemStack> items) {
+        return calculateRequiredSlots(items) <= 54;
+    }
+
     /**
      * Stores items into a chest (and an adjacent chest if needed) at the target location.
      * All items must be stored without overflow; on any failure, blocks are rolled back

src/main/java/dev/marcospaulo/canalhandia/XpAndItemMergeListener.java

@@ -0,0 +1,187 @@
+package dev.marcospaulo.canalhandia;
+
+import com.destroystokyo.paper.event.player.PlayerPickupExperienceEvent;
+import org.bukkit.Location;
+import org.bukkit.Sound;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.ExperienceOrb;
+import org.bukkit.entity.Item;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.entity.ItemSpawnEvent;
+import org.bukkit.inventory.ItemStack;
+
+import org.bukkit.Material;
+import org.bukkit.enchantments.Enchantment;
+import org.bukkit.inventory.PlayerInventory;
+import org.bukkit.inventory.meta.Damageable;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Optimises XP and Item collection by instantly vacuuming nearby XP orbs into the player's
+ * XP bar (bypassing Vanilla's 2-tick per orb delay), repairing Mending equipment first,
+ * and consolidating spawned item drops into full stacks.
+ */
+public final class XpAndItemMergeListener implements Listener {
+
+    private final Canalhandia plugin;
+
+    public XpAndItemMergeListener(Canalhandia plugin) {
+        this.plugin = plugin;
+    }
+
+    /**
+     * Vacuums all experience orbs within radius instantly on player contact and repairs Mending items.
+     */
+    @EventHandler(priority = EventPriority.HIGH, ignoreCancelled = true)
+    public void onPlayerPickupXp(PlayerPickupExperienceEvent event) {
+        Player player = event.getPlayer();
+        Location loc = player.getLocation();
+        if (loc.getWorld() == null) {
+            return;
+        }
+
+        int totalExp = 0;
+        try {
+            for (Entity entity : loc.getWorld().getNearbyEntities(loc, 6.0, 6.0, 6.0)) {
+                if (entity instanceof ExperienceOrb orb && orb.isValid()) {
+                    totalExp += orb.getExperience();
+                    orb.remove();
+                }
+            }
+        } catch (Exception ignored) {
+        }
+
+        if (totalExp > 0) {
+            int leftoverExp = applyMending(player, totalExp);
+            if (leftoverExp > 0) {
+                player.giveExp(leftoverExp);
+            }
+            try {
+                player.playSound(loc, Sound.ENTITY_EXPERIENCE_ORB_PICKUP, 0.5f, 1.2f);
+            } catch (Exception ignored) {
+            }
+            event.setCancelled(true);
+        }
+    }
+
+    /**
+     * Repairs equipped items with Mending enchantment using the collected XP.
+     * Returns remaining XP to be added to the player's experience bar.
+     */
+    public static int applyMending(Player player, int totalExp) {
+        if (player == null || totalExp <= 0) {
+            return totalExp;
+        }
+        int remainingXp = totalExp;
+        PlayerInventory inv = player.getInventory();
+
+        List<ItemStack> candidates = new ArrayList<>();
+        ItemStack main = inv.getItemInMainHand();
+        if (isDamagedMending(main)) candidates.add(main);
+
+        ItemStack off = inv.getItemInOffHand();
+        if (isDamagedMending(off)) candidates.add(off);
+
+        for (ItemStack armor : inv.getArmorContents()) {
+            if (isDamagedMending(armor)) candidates.add(armor);
+        }
+
+        for (ItemStack item : candidates) {
+            if (remainingXp <= 0) {
+                break;
+            }
+            if (item.getItemMeta() instanceof Damageable dmg && dmg.hasDamage()) {
+                int damage = dmg.getDamage();
+                int[] repair = calculateMendingRepair(damage, remainingXp);
+                int repaired = repair[0];
+                int xpUsed = repair[1];
+                if (repaired > 0) {
+                    dmg.setDamage(damage - repaired);
+                    item.setItemMeta(dmg);
+                    remainingXp -= xpUsed;
+                }
+            }
+        }
+        return remainingXp;
+    }
+
+    private static boolean isDamagedMending(ItemStack item) {
+        if (item == null || item.getType() == Material.AIR || !item.hasItemMeta()) {
+            return false;
+        }
+        if (!item.containsEnchantment(Enchantment.MENDING)) {
+            return false;
+        }
+        if (item.getItemMeta() instanceof Damageable dmg) {
+            return dmg.hasDamage() && dmg.getDamage() > 0;
+        }
+        return false;
+    }
+
+    /**
+     * Calculates repair amount and used XP for a given damage and available XP.
+     * Returns an int array: [durabilityRepaired, xpUsed].
+     */
+    public static int[] calculateMendingRepair(int damage, int availableXp) {
+        if (damage <= 0 || availableXp <= 0) {
+            return new int[]{0, 0};
+        }
+        int durabilityToRepair = Math.min(damage, availableXp * 2);
+        int xpUsed = (durabilityToRepair + 1) / 2;
+        return new int[]{durabilityToRepair, xpUsed};
+    }
+
+    /**
+     * Consolidates spawned items of the same type in a 4-block radius into unified stacks.
+     */
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void onItemSpawn(ItemSpawnEvent event) {
+        Item item = event.getEntity();
+        ItemStack stack = item.getItemStack();
+        if (stack.getAmount() >= stack.getMaxStackSize() || item.getWorld() == null) {
+            return;
+        }
+
+        try {
+            for (Entity e : item.getWorld().getNearbyEntities(item.getLocation(), 4.0, 4.0, 4.0)) {
+                if (e instanceof Item other && other != item && other.isValid()) {
+                    ItemStack otherStack = other.getItemStack();
+                    if (otherStack.isSimilar(stack)) {
+                        int toTransfer = calculateTransfer(stack.getAmount(), stack.getMaxStackSize(), otherStack.getAmount());
+                        if (toTransfer > 0) {
+                            stack.setAmount(stack.getAmount() + toTransfer);
+                            otherStack.setAmount(otherStack.getAmount() - toTransfer);
+                            if (otherStack.getAmount() <= 0) {
+                                other.remove();
+                            } else {
+                                other.setItemStack(otherStack);
+                            }
+                            item.setItemStack(stack);
+                            if (stack.getAmount() >= stack.getMaxStackSize()) {
+                                break;
+                            }
+                        }
+                    }
+                }
+            }
+        } catch (Exception ignored) {
+        }
+    }
+
+    /** Pure transfer amount calculator for stack consolidation. */
+    public static int calculateTransfer(int targetAmount, int targetMax, int sourceAmount) {
+        if (targetAmount < 0 || targetMax <= 0 || sourceAmount <= 0) {
+            return 0;
+        }
+        int canAdd = targetMax - targetAmount;
+        if (canAdd <= 0) {
+            return 0;
+        }
+        return Math.min(canAdd, sourceAmount);
+    }
+}

src/main/resources/config.yml

@@ -344,3 +344,43 @@ mortes:
       - "BONE | Osso da Sorte | Um ossinho pra você, campeão."
       - "COOKIE | Cookie de Consolação | Cookie de consolação. Vai que melhora."
       - "ROTTEN_FLESH | Carne Podre | É o que tinha sobrado na despensa."
+
+# --- Âncoras de Chunk (Chunk Loaders) ----------------------------------------
+chunkloader:
+  # Limite máximo de âncoras ativas por jogador por padrão.
+  # Pode ser alterado por jogador com /chunkloader limite <jogador> <qtd>.
+  limite-padrao: 1
+
+  # Exibe os marcadores de âncoras ativas no BlueMap.
+  bluemap: true
+
+  # Configurações de simulação de entidades na chunk carregada:
+  simulacao:
+    # Se true, mantém ativas gaiolas de monstros (spawners de blaze, esqueletos, etc.)
+    # mesmo sem jogadores por perto.
+    gaiolas-ativas: true
+
+    # Se true, simula o surgimento natural de monstros em plataformas escuras,
+    # slime chunks e fortalezas do nether. Se false, apenas entidades existentes funcionam.
+    spawn-monstros: true
+
+    # Teto máximo de monstros na chunk antes de pausar o spawn natural (evita acúmulo de lag).
+    limite-monstros-chunk: 20
+
+    # Se true, mantém animais, aldeões, ferro-golems e colheitas sendo processados na chunk.
+    tick-entidades-passivas: true
+
+  # Sistema de combustível e tempo de expiração:
+  combustivel:
+    # Se true, âncoras requerem abastecimento com itens e têm tempo de expiração.
+    # Se false, todas as âncoras colocadas são permanentes por padrão.
+    requer-tempo: true
+
+    # Tempo inicial padrão dado ao criar e colocar uma nova âncora (em horas).
+    tempo-inicial-horas: 24
+
+# --- Salva-Void (Resgate de Morte no Vazio) -----------------------------------
+salvavoid:
+  # Raio máximo de busca em blocos a partir de onde o jogador caiu para achar
+  # terreno seguro e colocar o baú com os itens resgatados.
+  raio-busca: 32

src/test/java/dev/marcospaulo/canalhandia/ChunkLoaderTest.java

@@ -122,6 +122,12 @@ class ChunkLoaderTest {
         assertEquals(renamed, loaders.find("#1"));
         assertEquals(renamed, loaders.find("1"));
 
+        // Loader 2 named "1" should be prioritized over ID 1 when querying by plain "1"
+        ChunkLoader loader2 = loaders.add("uuid-marcos", "Marcos", "world", 200, 64, 300, "1", 0L);
+        assertEquals(loader2, loaders.find("1"));
+        assertEquals(renamed, loaders.find("#1"));
+        assertEquals(loader2, loaders.find("#2"));
+
         assertTrue(loaders.setEnabled(loader.id(), false));
         ChunkLoader disabled = loaders.byId(loader.id());
         assertNotNull(disabled);
@@ -151,6 +157,69 @@ class ChunkLoaderTest {
         ChunkLoader expired = timed.withExpiresAt(System.currentTimeMillis() - 1000L);
         assertTrue(expired.isExpired());
         assertEquals("Expirado", expired.timeLeft());
+
+        assertTrue(loaders.setExpiresAt(loader.id(), 0L));
+        ChunkLoader permanent = loaders.byId(loader.id());
+        assertNotNull(permanent);
+        assertEquals(0L, permanent.expiresAt());
+        assertEquals("Permanente", permanent.timeLeft());
+        assertFalse(permanent.isExpired());
+    }
+
+    @Test
+    void pickEntityTypeReturnsExpectedEntitiesByEnvironment() {
+        // Nether
+        assertEquals(org.bukkit.entity.EntityType.ZOMBIFIED_PIGLIN,
+                ChunkLoaders.pickEntityType(org.bukkit.World.Environment.NETHER, false, 64, 0, 10));
+        assertEquals(org.bukkit.entity.EntityType.WITHER_SKELETON,
+                ChunkLoaders.pickEntityType(org.bukkit.World.Environment.NETHER, false, 64, 0, 50));
+        assertEquals(org.bukkit.entity.EntityType.BLAZE,
+                ChunkLoaders.pickEntityType(org.bukkit.World.Environment.NETHER, false, 64, 0, 75));
+        assertEquals(org.bukkit.entity.EntityType.MAGMA_CUBE,
+                ChunkLoaders.pickEntityType(org.bukkit.World.Environment.NETHER, false, 64, 0, 90));
+        assertNull(ChunkLoaders.pickEntityType(org.bukkit.World.Environment.NETHER, false, 64, 12, 10));
+
+        // End
+        assertEquals(org.bukkit.entity.EntityType.ENDERMAN,
+                ChunkLoaders.pickEntityType(org.bukkit.World.Environment.THE_END, false, 64, 15, 50));
+
+        // Overworld Slime Chunk
+        assertEquals(org.bukkit.entity.EntityType.SLIME,
+                ChunkLoaders.pickEntityType(org.bukkit.World.Environment.NORMAL, true, 30, 5, 0));
+
+        // Overworld Normal Darkness
+        assertEquals(org.bukkit.entity.EntityType.ZOMBIE,
+                ChunkLoaders.pickEntityType(org.bukkit.World.Environment.NORMAL, false, 64, 0, 10));
+        assertEquals(org.bukkit.entity.EntityType.SKELETON,
+                ChunkLoaders.pickEntityType(org.bukkit.World.Environment.NORMAL, false, 64, 0, 45));
+        assertEquals(org.bukkit.entity.EntityType.CREEPER,
+                ChunkLoaders.pickEntityType(org.bukkit.World.Environment.NORMAL, false, 64, 0, 75));
+        assertEquals(org.bukkit.entity.EntityType.SPIDER,
+                ChunkLoaders.pickEntityType(org.bukkit.World.Environment.NORMAL, false, 64, 0, 90));
+        assertEquals(org.bukkit.entity.EntityType.WITCH,
+                ChunkLoaders.pickEntityType(org.bukkit.World.Environment.NORMAL, false, 64, 0, 99));
+
+        // Overworld in Light -> Null
+        assertNull(ChunkLoaders.pickEntityType(org.bukkit.World.Environment.NORMAL, false, 64, 5, 10));
+    }
+
+    @Test
+    void createsLoaderWithInitialExpiration() {
+        long targetExpiry = System.currentTimeMillis() + 86400_000L;
+        ChunkLoader loader = loaders.add("uuid-1", "Marcos", "world", 100, 64, 200, "Base", targetExpiry);
+        assertEquals(targetExpiry, loader.expiresAt());
+        assertFalse(loader.isExpired());
+        assertTrue(loader.timeLeft().contains("h"));
+    }
+
+    @Test
+    void recognizesTrapdoorsCorrectly() {
+        assertTrue(ChunkLoaders.isTrapdoor(org.bukkit.Material.OAK_TRAPDOOR));
+        assertTrue(ChunkLoaders.isTrapdoor(org.bukkit.Material.IRON_TRAPDOOR));
+        assertTrue(ChunkLoaders.isTrapdoor(org.bukkit.Material.SPRUCE_TRAPDOOR));
+        assertFalse(ChunkLoaders.isTrapdoor(org.bukkit.Material.AIR));
+        assertFalse(ChunkLoaders.isTrapdoor(org.bukkit.Material.STONE));
+        assertFalse(ChunkLoaders.isTrapdoor(null));
     }
 
     @Test

src/test/java/dev/marcospaulo/canalhandia/TitlesTest.java

@@ -25,10 +25,14 @@ class TitlesTest {
     void matchesEarnedTitleByKeyAndByName() {
         Achievement pedreiro = Achievement.byKey("pedreiro");
         Achievement veterano = Achievement.byKey("veterano");
-        List<Achievement> earned = List.of(pedreiro, veterano);
+        Achievement cacador = Achievement.byKey("cacador");
+        List<Achievement> earned = List.of(pedreiro, veterano, cacador);
         assertSame(pedreiro, CanalhandiaCommand.matchEarned("pedreiro", earned));
         assertSame(veterano, CanalhandiaCommand.matchEarned("Veterano", earned)); // display name, ci
         assertSame(pedreiro, CanalhandiaCommand.matchEarned("Pedreiro", earned));
+        assertSame(cacador, CanalhandiaCommand.matchEarned("cacador", earned));
+        assertSame(cacador, CanalhandiaCommand.matchEarned("Caçador", earned));
+        assertSame(cacador, CanalhandiaCommand.matchEarned("Cacador", earned));
     }
 
     @Test

src/test/java/dev/marcospaulo/canalhandia/VoidProtectionTest.java

@@ -32,9 +32,53 @@ class VoidProtectionTest {
         assertFalse(VoidProtection.rescueToChest(List.of(), null));
     }
 
+    @Test
+    void validatesSafeGroundMaterials() {
+        assertTrue(VoidProtection.isSafeGroundMaterial(org.bukkit.Material.STONE));
+        assertTrue(VoidProtection.isSafeGroundMaterial(org.bukkit.Material.GRASS_BLOCK));
+        assertTrue(VoidProtection.isSafeGroundMaterial(org.bukkit.Material.DIRT));
+        assertTrue(VoidProtection.isSafeGroundMaterial(org.bukkit.Material.OBSIDIAN));
+
+        assertFalse(VoidProtection.isSafeGroundMaterial(null));
+        assertFalse(VoidProtection.isSafeGroundMaterial(org.bukkit.Material.AIR));
+        assertFalse(VoidProtection.isSafeGroundMaterial(org.bukkit.Material.LAVA));
+        assertFalse(VoidProtection.isSafeGroundMaterial(org.bukkit.Material.FIRE));
+        assertFalse(VoidProtection.isSafeGroundMaterial(org.bukkit.Material.SOUL_FIRE));
+        assertFalse(VoidProtection.isSafeGroundMaterial(org.bukkit.Material.CACTUS));
+        assertFalse(VoidProtection.isSafeGroundMaterial(org.bukkit.Material.MAGMA_BLOCK));
+        assertFalse(VoidProtection.isSafeGroundMaterial(org.bukkit.Material.SWEET_BERRY_BUSH));
+        assertFalse(VoidProtection.isSafeGroundMaterial(org.bukkit.Material.WITHER_ROSE));
+        assertFalse(VoidProtection.isSafeGroundMaterial(org.bukkit.Material.POWDER_SNOW));
+    }
+
+    @Test
+    void validatesReplaceableMaterials() {
+        assertTrue(VoidProtection.isReplaceableMaterial(org.bukkit.Material.AIR));
+        assertTrue(VoidProtection.isReplaceableMaterial(org.bukkit.Material.CAVE_AIR));
+        assertTrue(VoidProtection.isReplaceableMaterial(org.bukkit.Material.VOID_AIR));
+        assertTrue(VoidProtection.isReplaceableMaterial(org.bukkit.Material.SHORT_GRASS));
+        assertTrue(VoidProtection.isReplaceableMaterial(org.bukkit.Material.TALL_GRASS));
+        assertTrue(VoidProtection.isReplaceableMaterial(org.bukkit.Material.SNOW));
+        assertTrue(VoidProtection.isReplaceableMaterial(org.bukkit.Material.FERN));
+        assertTrue(VoidProtection.isReplaceableMaterial(org.bukkit.Material.LARGE_FERN));
+
+        assertFalse(VoidProtection.isReplaceableMaterial(null));
+        assertFalse(VoidProtection.isReplaceableMaterial(org.bukkit.Material.STONE));
+        assertFalse(VoidProtection.isReplaceableMaterial(org.bukkit.Material.CHEST));
+        assertFalse(VoidProtection.isReplaceableMaterial(org.bukkit.Material.OBSIDIAN));
+    }
+
     @Test
     void nullBlocksAreNeitherSafeNorReplaceable() {
         assertFalse(VoidProtection.isSafeGround(null));
         assertFalse(VoidProtection.isReplaceable(null));
     }
+
+    @Test
+    void calculatesRequiredSlotsAndChestFit() {
+        assertEquals(0, VoidProtection.calculateRequiredSlots(null));
+        assertEquals(0, VoidProtection.calculateRequiredSlots(List.of()));
+        assertTrue(VoidProtection.canFitInSingleChest(List.of()));
+        assertTrue(VoidProtection.canFitInDoubleChest(List.of()));
+    }
 }

src/test/java/dev/marcospaulo/canalhandia/XpAndItemMergeTest.java

@@ -0,0 +1,55 @@
+package dev.marcospaulo.canalhandia;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class XpAndItemMergeTest {
+
+    @Test
+    void handlesZeroOrNegativeAmountsGracefully() {
+        assertEquals(0, XpAndItemMergeListener.calculateTransfer(0, 0, 0));
+        assertEquals(0, XpAndItemMergeListener.calculateTransfer(-1, 16, 5));
+        assertEquals(0, XpAndItemMergeListener.calculateTransfer(16, 16, 5));
+        assertEquals(0, XpAndItemMergeListener.calculateTransfer(10, 16, 0));
+    }
+
+    @Test
+    void calculatesTransfersUpToMaxCapacity() {
+        // Target has 10, max is 16, source has 10 -> can transfer 6
+        assertEquals(6, XpAndItemMergeListener.calculateTransfer(10, 16, 10));
+
+        // Target has 5, max is 64, source has 20 -> can transfer all 20
+        assertEquals(20, XpAndItemMergeListener.calculateTransfer(5, 64, 20));
+
+        // Target has 63, max is 64, source has 10 -> can transfer 1
+        assertEquals(1, XpAndItemMergeListener.calculateTransfer(63, 64, 10));
+    }
+
+    @Test
+    void calculatesMendingRepairCorrectly() {
+        // Zero damage or zero XP -> 0 repair
+        int[] r1 = XpAndItemMergeListener.calculateMendingRepair(0, 50);
+        assertEquals(0, r1[0]);
+        assertEquals(0, r1[1]);
+
+        int[] r2 = XpAndItemMergeListener.calculateMendingRepair(50, 0);
+        assertEquals(0, r2[0]);
+        assertEquals(0, r2[1]);
+
+        // 10 damage, 100 XP -> repairs 10 durability, uses 5 XP
+        int[] r3 = XpAndItemMergeListener.calculateMendingRepair(10, 100);
+        assertEquals(10, r3[0]);
+        assertEquals(5, r3[1]);
+
+        // 5 damage, 10 XP -> repairs 5 durability, uses 3 XP
+        int[] r4 = XpAndItemMergeListener.calculateMendingRepair(5, 10);
+        assertEquals(5, r4[0]);
+        assertEquals(3, r4[1]);
+
+        // 10 damage, 2 XP -> repairs 4 durability (2 * 2), uses 2 XP
+        int[] r5 = XpAndItemMergeListener.calculateMendingRepair(10, 2);
+        assertEquals(4, r5[0]);
+        assertEquals(2, r5[1]);
+    }
+}