diff --git a/.idea/gradle.xml b/.idea/gradle.xml
index 351d25e..6c35d73 100644
--- a/.idea/gradle.xml
+++ b/.idea/gradle.xml
@@ -17,7 +17,6 @@
           </compositeBuild>
         </compositeConfiguration>
         <option name="externalProjectPath" value="$PROJECT_DIR$" />
-        <option name="gradleJvm" value="#JAVA_HOME" />
         <option name="modules">
           <set>
             <option value="$PROJECT_DIR$/../build-logic" />
diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 8c0840c..affa795 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -5,20 +5,26 @@
   </component>
   <component name="ChangeListManager">
     <list default="true" id="56c685a1-f609-4ffd-a951-849beb2a7f8d" name="Changes" comment="">
-      <change beforePath="$PROJECT_DIR$/../build-logic/.idea/gradle.xml" beforeDir="false" afterPath="$PROJECT_DIR$/../build-logic/.idea/gradle.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/../build-logic/convention/build.gradle.kts" beforeDir="false" afterPath="$PROJECT_DIR$/../build-logic/convention/build.gradle.kts" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/../build-logic/convention/src/main/kotlin/de/kentoj/scrow/BaseDependenciesConvention.kt" beforeDir="false" afterPath="$PROJECT_DIR$/../build-logic/convention/src/main/kotlin/de/kentoj/scrow/BaseDependenciesConvention.kt" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/../build-logic/convention/src/main/kotlin/de/kentoj/scrow/DatabaseConvention.kt" beforeDir="false" afterPath="$PROJECT_DIR$/../build-logic/convention/src/main/kotlin/de/kentoj/scrow/DatabaseConvention.kt" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/../build-logic/gradle/libs.versions.toml" beforeDir="false" />
+      <change afterPath="$PROJECT_DIR$/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/ChunkPos.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/Range.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/RegionManager.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/event/RegionEvent.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/event/RegionJoinEvent.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/event/RegionLeaveEvent.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/impl/AbstractRegion.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/impl/CuboidRegion.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/impl/CylinderRegion.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/impl/MergedRegion.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/impl/Region.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/core-bukkit-impl/src/main/java/de/kentoj/scrow/bukkit/region/RegionPlayerTracker.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/core-bukkit-impl/src/main/java/de/kentoj/scrow/bukkit/region/RegionTask.java" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/gradle.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/gradle.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/build.gradle.kts" beforeDir="false" afterPath="$PROJECT_DIR$/build.gradle.kts" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/core-bukkit-api/build.gradle.kts" beforeDir="false" afterPath="$PROJECT_DIR$/core-bukkit-api/build.gradle.kts" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/core-bukkit-impl/build.gradle.kts" beforeDir="false" afterPath="$PROJECT_DIR$/core-bukkit-impl/build.gradle.kts" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/ScrowAPI.java" beforeDir="false" afterPath="$PROJECT_DIR$/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/ScrowAPI.java" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/core-bukkit-impl/src/main/java/de/kentoj/scrow/bukkit/CoreImplPlugin.java" beforeDir="false" afterPath="$PROJECT_DIR$/core-bukkit-impl/src/main/java/de/kentoj/scrow/bukkit/CoreImplPlugin.java" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/core-bukkit-impl/src/main/java/de/kentoj/scrow/bukkit/ScrowAPISurface.java" beforeDir="false" afterPath="$PROJECT_DIR$/core-bukkit-impl/src/main/java/de/kentoj/scrow/bukkit/ScrowAPISurface.java" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/core-lib/build.gradle.kts" beforeDir="false" afterPath="$PROJECT_DIR$/core-lib/build.gradle.kts" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/core-velocity-api/build.gradle.kts" beforeDir="false" afterPath="$PROJECT_DIR$/core-velocity-api/build.gradle.kts" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/core-velocity-impl/build.gradle.kts" beforeDir="false" afterPath="$PROJECT_DIR$/core-velocity-impl/build.gradle.kts" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/gradle.properties.kts" beforeDir="false" />
-      <change beforePath="$PROJECT_DIR$/settings.gradle.kts" beforeDir="false" afterPath="$PROJECT_DIR$/settings.gradle.kts" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -39,6 +45,15 @@
         <task path="$PROJECT_DIR$">
           <activation />
         </task>
+        <task path="$PROJECT_DIR$/core-lib">
+          <activation />
+        </task>
+        <task path="$PROJECT_DIR$/core-bukkit-impl">
+          <activation />
+        </task>
+        <task path="$PROJECT_DIR$/core-bukkit-api">
+          <activation />
+        </task>
         <projects_view>
           <tree_state>
             <expand>
@@ -55,14 +70,43 @@
                 <item name="" type="6a2764b6:ExternalProjectsStructure$RootNode" />
                 <item name="core" type="f1a62948:ProjectNode" />
                 <item name="core" type="2d1252cf:ModuleNode" />
+                <item name="core-bukkit-api" type="2d1252cf:ModuleNode" />
+              </path>
+              <path>
+                <item name="" type="6a2764b6:ExternalProjectsStructure$RootNode" />
+                <item name="core" type="f1a62948:ProjectNode" />
+                <item name="core" type="2d1252cf:ModuleNode" />
+                <item name="core-bukkit-api" type="2d1252cf:ModuleNode" />
                 <item name="Tasks" type="e4a08cd1:TasksNode" />
               </path>
               <path>
                 <item name="" type="6a2764b6:ExternalProjectsStructure$RootNode" />
                 <item name="core" type="f1a62948:ProjectNode" />
                 <item name="core" type="2d1252cf:ModuleNode" />
+                <item name="core-bukkit-api" type="2d1252cf:ModuleNode" />
                 <item name="Tasks" type="e4a08cd1:TasksNode" />
-                <item name="build" type="c8890929:TasksNode$1" />
+                <item name="publishing" type="c8890929:TasksNode$1" />
+              </path>
+              <path>
+                <item name="" type="6a2764b6:ExternalProjectsStructure$RootNode" />
+                <item name="core" type="f1a62948:ProjectNode" />
+                <item name="core" type="2d1252cf:ModuleNode" />
+                <item name="core-lib" type="2d1252cf:ModuleNode" />
+              </path>
+              <path>
+                <item name="" type="6a2764b6:ExternalProjectsStructure$RootNode" />
+                <item name="core" type="f1a62948:ProjectNode" />
+                <item name="core" type="2d1252cf:ModuleNode" />
+                <item name="core-lib" type="2d1252cf:ModuleNode" />
+                <item name="Tasks" type="e4a08cd1:TasksNode" />
+              </path>
+              <path>
+                <item name="" type="6a2764b6:ExternalProjectsStructure$RootNode" />
+                <item name="core" type="f1a62948:ProjectNode" />
+                <item name="core" type="2d1252cf:ModuleNode" />
+                <item name="core-lib" type="2d1252cf:ModuleNode" />
+                <item name="Tasks" type="e4a08cd1:TasksNode" />
+                <item name="publishing" type="c8890929:TasksNode$1" />
               </path>
             </expand>
             <select />
@@ -82,7 +126,7 @@
   <component name="Git.Settings">
     <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
   </component>
-  <component name="GradleScriptDefinitionsStorage" workingDir="$PROJECT_DIR$" gradleHome="$USER_HOME$/.gradle/wrapper/dists/gradle-8.11-bin/c4te04g51qsyw1bxcb929u7br/gradle-8.11" javaHome="/usr/lib/jvm/default-jdk" gradleVersion="8.11" />
+  <component name="GradleScriptDefinitionsStorage" workingDir="$PROJECT_DIR$" gradleHome="$USER_HOME$/.gradle/wrapper/dists/gradle-8.11-bin/c4te04g51qsyw1bxcb929u7br/gradle-8.11" javaHome="/usr/lib/jvm/openjdk21" gradleVersion="8.11" />
   <component name="ProjectColorInfo">{
   &quot;customColor&quot;: &quot;&quot;,
   &quot;associatedIndex&quot;: 0
@@ -97,8 +141,10 @@
   </component>
   <component name="PropertiesComponent"><![CDATA[{
   "keyToString": {
+    "Gradle.Download Sources.executor": "Run",
     "Gradle.core [build].executor": "Run",
     "Gradle.core [clean].executor": "Run",
+    "Gradle.core [publishAllPublicationsToScrowRepository].executor": "Run",
     "ModuleVcsDetector.initialDetectionPerformed": "true",
     "RunOnceActivity.ShowReadmeOnStart": "true",
     "RunOnceActivity.TerminalTabsStorage.copyFrom.TerminalArrangementManager.252": "true",
@@ -107,15 +153,18 @@
     "kotlin-language-version-configured": "true",
     "last_opened_file_path": "/home/a/src/scrow/core/settings.gradle.kts",
     "project.structure.last.edited": "Modules",
-    "project.structure.proportion": "0.0",
-    "project.structure.side.proportion": "0.0",
-    "settings.editor.selected.configurable": "configurable.group.appearance"
+    "project.structure.proportion": "0.15",
+    "project.structure.side.proportion": "0.6268199",
+    "settings.editor.selected.configurable": "editor.preferences.smartKeys"
   }
 }]]></component>
   <component name="RecentsManager">
     <key name="MoveFile.RECENT_KEYS">
       <recent name="$PROJECT_DIR$/build-logic/gradle" />
     </key>
+    <key name="CopyClassDialog.RECENTS_KEY">
+      <recent name="de.kentoj.scrow.bukkit.region.event" />
+    </key>
   </component>
   <component name="RunAnythingCache">
     <option name="myCommands">
@@ -167,6 +216,28 @@
       <RunAsTest>false</RunAsTest>
       <method v="2" />
     </configuration>
+    <configuration name="core [publishAllPublicationsToScrowRepository]" type="GradleRunConfiguration" factoryName="Gradle" temporary="true">
+      <ExternalSystemSettings>
+        <option name="executionName" />
+        <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="externalSystemIdString" value="GRADLE" />
+        <option name="scriptParameters" />
+        <option name="taskDescriptions">
+          <list />
+        </option>
+        <option name="taskNames">
+          <list>
+            <option value="publishAllPublicationsToScrowRepository" />
+          </list>
+        </option>
+        <option name="vmOptions" />
+      </ExternalSystemSettings>
+      <ExternalSystemDebugServerProcess>true</ExternalSystemDebugServerProcess>
+      <ExternalSystemReattachDebugProcess>true</ExternalSystemReattachDebugProcess>
+      <DebugAllEnabled>false</DebugAllEnabled>
+      <RunAsTest>false</RunAsTest>
+      <method v="2" />
+    </configuration>
     <configuration default="true" type="JetRunConfigurationType">
       <module name="kotlin.scripts.KotlinSettingsScript.build-logic:settings.gradle.kts" />
       <method v="2">
@@ -181,6 +252,7 @@
     <recent_temporary>
       <list>
         <item itemvalue="Gradle.core [build]" />
+        <item itemvalue="Gradle.core [publishAllPublicationsToScrowRepository]" />
         <item itemvalue="Gradle.core [clean]" />
       </list>
     </recent_temporary>
diff --git a/build.gradle.kts b/build.gradle.kts
index 034572b..d4c61fa 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,6 +1,10 @@
 group = "de.kentoj.scrow"
-version = "1.0.0"
+version = "1.0.0-SNAPSHOT"
 
 subprojects {
     version = rootProject.version
+
+    tasks.withType<Jar> {
+        archiveVersion = ""
+    }
 }
diff --git a/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/ScrowAPI.java b/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/ScrowAPI.java
index c733445..bad5d00 100644
--- a/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/ScrowAPI.java
+++ b/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/ScrowAPI.java
@@ -3,6 +3,7 @@ package de.kentoj.scrow.bukkit;
 import de.kentoj.kencommandapi.BukkitKenCommandApi;
 import de.kentoj.scrow.bukkit.friends.FriendRequestService;
 import de.kentoj.scrow.bukkit.friends.FriendshipService;
+import de.kentoj.scrow.bukkit.region.RegionManager;
 import de.kentoj.scrowlib.connection.DatabaseConnectionFactory;
 import de.kentoj.scrowlib.servermanager.ServerManager;
 import io.nats.client.Connection;
@@ -19,8 +20,6 @@ public class ScrowAPI {
     @Getter
     private static DatabaseConnectionFactory dbConFactory;
     @Getter
-    private static BukkitKenCommandApi commandApi;
-    @Getter
     private static Scheduler minecraftScheduler;
     @Getter
     private static EconomyService economyService;
@@ -32,17 +31,16 @@ public class ScrowAPI {
     private static Connection nats;
     @Getter
     private static ServerManager serverManager;
+    @Getter
+    private static final RegionManager regionManager = new RegionManager();
+    @Getter
+    private static final BukkitKenCommandApi commandApi = new BukkitKenCommandApi();
 
     @ApiStatus.Internal
     public static void setEconomyService(EconomyService economyService) {
         ScrowAPI.economyService = economyService;
     }
 
-    @ApiStatus.Internal
-    public static void setCommandApi(BukkitKenCommandApi commandApi) {
-        ScrowAPI.commandApi = commandApi;
-    }
-
     @ApiStatus.Internal
     public static void setMinecraftScheduler(Scheduler minecraftScheduler) {
         ScrowAPI.minecraftScheduler = minecraftScheduler;
diff --git a/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/ChunkPos.java b/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/ChunkPos.java
new file mode 100644
index 0000000..d621849
--- /dev/null
+++ b/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/ChunkPos.java
@@ -0,0 +1,14 @@
+package de.kentoj.scrow.bukkit.region;
+
+import lombok.Value;
+import org.bukkit.Chunk;
+
+@Value
+public class ChunkPos {
+    int x;
+    int z;
+
+    public static ChunkPos fromChunk(Chunk chunk) {
+        return new ChunkPos(chunk.getX(), chunk.getZ());
+    }
+}
diff --git a/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/Range.java b/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/Range.java
new file mode 100644
index 0000000..0b10d22
--- /dev/null
+++ b/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/Range.java
@@ -0,0 +1,27 @@
+package de.kentoj.scrow.bukkit.region;
+
+import lombok.Getter;
+
+@Getter
+public final class Range {
+    private final double min;
+    private final double max;
+
+    public boolean contains(double num) {
+        return min <= num && num <= max;
+    }
+
+    public double getLength() {
+        return max - min;
+    }
+
+    public Range(double a, double b) {
+        if (a < b) {
+            min = a;
+            max = b;
+        } else {
+            min = b;
+            max = a;
+        }
+    }
+}
diff --git a/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/RegionManager.java b/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/RegionManager.java
new file mode 100644
index 0000000..95a9c83
--- /dev/null
+++ b/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/RegionManager.java
@@ -0,0 +1,42 @@
+package de.kentoj.scrow.bukkit.region;
+
+import de.kentoj.scrow.bukkit.region.impl.Region;
+
+import java.util.*;
+
+public class RegionManager {
+
+    private final Map<Long, List<UUID>> chunkIndex = new HashMap<>();
+    private final Map<UUID, Region> regions = new HashMap<>();
+
+    public List<Region> getRegions(ChunkPos chunkPos) {
+        long key = toKey(chunkPos.getX(), chunkPos.getZ());
+        var uuids = chunkIndex.get(key);
+        if (uuids == null) return Collections.emptyList();
+        return uuids.stream().map(regions::get).toList();
+    }
+
+    public void registerRegion(Region region) {
+        for (ChunkPos chunkPos : region.getChunks()) {
+            var key = toKey(chunkPos.getX(), chunkPos.getZ());
+            chunkIndex.computeIfAbsent(key, __ -> new ArrayList<>())
+                    .add(region.getUuid());
+        }
+        regions.put(region.getUuid(), region);
+    }
+
+    public void unregisterRegion(Region region) {
+        for (ChunkPos chunkPos : region.getChunks()) {
+            var key = toKey(chunkPos.getX(), chunkPos.getZ());
+            var list = chunkIndex.get(key);
+            if (list == null) return;
+            list.remove(region.getUuid());
+        }
+        regions.remove(region.getUuid());
+    }
+
+    public long toKey(int x, int z) {
+        // chatgpt
+        return (((long) x) << 32) ^ (z & 0xffffffffL);
+    }
+}
diff --git a/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/event/RegionEvent.java b/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/event/RegionEvent.java
new file mode 100644
index 0000000..f8ef7e4
--- /dev/null
+++ b/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/event/RegionEvent.java
@@ -0,0 +1,14 @@
+package de.kentoj.scrow.bukkit.region.event;
+
+import de.kentoj.scrow.bukkit.region.impl.Region;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Event;
+
+@RequiredArgsConstructor
+@Getter
+public abstract class RegionEvent extends Event {
+    private final Region region;
+    private final Player player;
+}
diff --git a/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/event/RegionJoinEvent.java b/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/event/RegionJoinEvent.java
new file mode 100644
index 0000000..8356425
--- /dev/null
+++ b/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/event/RegionJoinEvent.java
@@ -0,0 +1,32 @@
+package de.kentoj.scrow.bukkit.region.event;
+
+import de.kentoj.scrow.bukkit.region.impl.Region;
+import lombok.Getter;
+import lombok.Setter;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+import org.jetbrains.annotations.NotNull;
+
+public class RegionJoinEvent extends RegionEvent implements Cancellable {
+
+    private static final HandlerList handlers = new HandlerList();
+
+    @Setter
+    @Getter
+    private boolean isCancelled;
+
+    public RegionJoinEvent(Region region, Player player) {
+        super(region, player);
+    }
+
+    @Override
+    public @NotNull HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
+}
diff --git a/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/event/RegionLeaveEvent.java b/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/event/RegionLeaveEvent.java
new file mode 100644
index 0000000..9c932d6
--- /dev/null
+++ b/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/event/RegionLeaveEvent.java
@@ -0,0 +1,31 @@
+package de.kentoj.scrow.bukkit.region.event;
+
+import de.kentoj.scrow.bukkit.region.impl.Region;
+import lombok.Getter;
+import lombok.Setter;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+import org.jetbrains.annotations.NotNull;
+
+public class RegionLeaveEvent extends RegionEvent implements Cancellable {
+
+    private static final HandlerList handlers = new HandlerList();
+
+    @Setter
+    @Getter
+    private boolean isCancelled;
+
+    public RegionLeaveEvent(Region region, Player player) {
+        super(region, player);
+    }
+
+    @Override
+    public @NotNull HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
+}
diff --git a/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/impl/AbstractRegion.java b/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/impl/AbstractRegion.java
new file mode 100644
index 0000000..1cf1e97
--- /dev/null
+++ b/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/impl/AbstractRegion.java
@@ -0,0 +1,11 @@
+package de.kentoj.scrow.bukkit.region.impl;
+
+import lombok.Getter;
+
+import java.util.UUID;
+
+public abstract class AbstractRegion implements Region {
+
+    @Getter
+    private final UUID uuid = UUID.randomUUID();
+}
diff --git a/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/impl/CuboidRegion.java b/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/impl/CuboidRegion.java
new file mode 100644
index 0000000..ca3b598
--- /dev/null
+++ b/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/impl/CuboidRegion.java
@@ -0,0 +1,45 @@
+package de.kentoj.scrow.bukkit.region.impl;
+
+import de.kentoj.scrow.bukkit.region.ChunkPos;
+import de.kentoj.scrow.bukkit.region.Range;
+import org.bukkit.Location;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class CuboidRegion extends AbstractRegion {
+
+    private final Range xRange;
+    private final Range yRange;
+    private final Range zRange;
+
+    public CuboidRegion(Location loc1, Location loc2) {
+        xRange = new Range(loc1.getX(), loc2.getX());
+        yRange = new Range(loc1.getY(), loc2.getY());
+        zRange = new Range(loc1.getY(), loc2.getY());
+    }
+
+    @Override
+    public boolean isInRegion(Location location) {
+        return xRange.contains(location.getX())
+                && yRange.contains(location.getY())
+                && zRange.contains(location.getZ());
+    }
+
+    @Override
+    public List<ChunkPos> getChunks() {
+        List<ChunkPos> res = new ArrayList<>();
+
+        int minChunkX = (int) Math.floor(xRange.getMin()) << 4;
+        int maxChunkX = (int) Math.ceil(xRange.getMax()) << 4;
+        for (int chunkX = minChunkX; chunkX < maxChunkX; chunkX++) {
+            int minChunkZ = (int) Math.floor(zRange.getMin()) << 4;
+            int maxChunkZ = (int) Math.ceil(zRange.getMax()) << 4;
+            for (int chunkZ = minChunkZ; chunkZ < maxChunkZ; chunkZ++) {
+                res.add(new ChunkPos(chunkX, chunkZ));
+            }
+        }
+
+        return res;
+    }
+}
diff --git a/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/impl/CylinderRegion.java b/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/impl/CylinderRegion.java
new file mode 100644
index 0000000..5805113
--- /dev/null
+++ b/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/impl/CylinderRegion.java
@@ -0,0 +1,42 @@
+package de.kentoj.scrow.bukkit.region.impl;
+
+import de.kentoj.scrow.bukkit.region.ChunkPos;
+import lombok.RequiredArgsConstructor;
+import org.bukkit.Location;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@RequiredArgsConstructor
+public class CylinderRegion extends AbstractRegion {
+
+    private final Location center;
+    private final double height;
+    private final double radius;
+
+    @Override
+    public boolean isInRegion(Location location) {
+        if (location.getY() < center.getY()) return false;
+        if (location.getY() > center.getY() + height) return false;
+        double diffX = location.getX() - center.getX();
+        double diffZ = location.getZ() - center.getZ();
+        return diffX * diffX + diffZ * diffZ <= radius * radius;
+    }
+
+    @Override
+    public List<ChunkPos> getChunks() {
+        List<ChunkPos> res = new ArrayList<>();
+        int a = (int) Math.ceil(radius / 16);
+
+        var centerChunkX = center.getBlockX() >> 4;
+        var centerChunkZ = center.getBlockZ() >> 4;
+
+        for (int x = -a; x <= a; x++) {
+            for (int z = -a; z <= a; z++) {
+                res.add(new ChunkPos(centerChunkX + x, centerChunkZ + z));
+            }
+        }
+
+        return res;
+    }
+}
diff --git a/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/impl/MergedRegion.java b/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/impl/MergedRegion.java
new file mode 100644
index 0000000..30a785f
--- /dev/null
+++ b/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/impl/MergedRegion.java
@@ -0,0 +1,39 @@
+package de.kentoj.scrow.bukkit.region.impl;
+
+import de.kentoj.scrow.bukkit.region.ChunkPos;
+import lombok.RequiredArgsConstructor;
+import org.bukkit.Location;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * region consisting of multiple regions
+ */
+@RequiredArgsConstructor
+public class MergedRegion extends AbstractRegion {
+
+    private final Region[] regions;
+
+    @Override
+    public boolean isInRegion(Location location) {
+        for (Region region : regions) {
+            if (region.isInRegion(location)) return true;
+        }
+        return false;
+    }
+
+    @Override
+    public List<ChunkPos> getChunks() {
+        return Arrays.stream(regions)
+                .map(Region::getChunks)
+                .reduce(new ArrayList<>(), (list, chunks) -> {
+                    list.addAll(chunks);
+                    return list;
+                })
+                .stream()
+                .distinct()
+                .toList();
+    }
+}
diff --git a/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/impl/Region.java b/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/impl/Region.java
new file mode 100644
index 0000000..82dad09
--- /dev/null
+++ b/core-bukkit-api/src/main/java/de/kentoj/scrow/bukkit/region/impl/Region.java
@@ -0,0 +1,19 @@
+package de.kentoj.scrow.bukkit.region.impl;
+
+import de.kentoj.scrow.bukkit.region.ChunkPos;
+import org.bukkit.Location;
+
+import java.util.List;
+import java.util.UUID;
+
+public interface Region {
+
+    /**
+     * A random uuid assigned to the Region at creation
+     */
+    UUID getUuid();
+
+    boolean isInRegion(Location location);
+
+    List<ChunkPos> getChunks();
+}
diff --git a/core-bukkit-impl/src/main/java/de/kentoj/scrow/bukkit/CoreImplPlugin.java b/core-bukkit-impl/src/main/java/de/kentoj/scrow/bukkit/CoreImplPlugin.java
index 689770b..be88436 100644
--- a/core-bukkit-impl/src/main/java/de/kentoj/scrow/bukkit/CoreImplPlugin.java
+++ b/core-bukkit-impl/src/main/java/de/kentoj/scrow/bukkit/CoreImplPlugin.java
@@ -3,6 +3,8 @@ package de.kentoj.scrow.bukkit;
 import de.kentoj.scrow.bukkit.crown.CrownCommand;
 import de.kentoj.scrow.bukkit.economy.CoinsCommand;
 import de.kentoj.scrow.bukkit.friends.command.FriendCommand;
+import de.kentoj.scrow.bukkit.region.RegionPlayerTracker;
+import de.kentoj.scrow.bukkit.region.RegionTask;
 import de.kentoj.scrow.bukkit.server.LobbyCommand;
 import de.kentoj.scrow.bukkit.server.PlayCommand;
 import org.bukkit.Bukkit;
@@ -24,6 +26,8 @@ public class CoreImplPlugin extends JavaPlugin {
             ScrowAPI.getCommandApi().register(new LobbyCommand().getRootNode());
         }
 
+        new RegionTask(new RegionPlayerTracker()).runTaskTimer(this, 10, 10);
+
         registerServer();
     }
 
diff --git a/core-bukkit-impl/src/main/java/de/kentoj/scrow/bukkit/ScrowAPISurface.java b/core-bukkit-impl/src/main/java/de/kentoj/scrow/bukkit/ScrowAPISurface.java
index 4784fee..648a1e7 100644
--- a/core-bukkit-impl/src/main/java/de/kentoj/scrow/bukkit/ScrowAPISurface.java
+++ b/core-bukkit-impl/src/main/java/de/kentoj/scrow/bukkit/ScrowAPISurface.java
@@ -52,7 +52,6 @@ public class ScrowAPISurface {
                 new PostgresFriendRequestService(ScrowAPI.getDbConFactory()) : new InMemoryFriendRequestService());
         ScrowAPI.setFriendshipService(ScrowAPI.getDbConFactory() != null ?
                 new PostgresFriendshipService(ScrowAPI.getDbConFactory()) : new InMemoryFriendshipService());
-        ScrowAPI.setCommandApi(new BukkitKenCommandApi());
     }
 
     public static void destroyScrowAPI() {
diff --git a/core-bukkit-impl/src/main/java/de/kentoj/scrow/bukkit/region/RegionPlayerTracker.java b/core-bukkit-impl/src/main/java/de/kentoj/scrow/bukkit/region/RegionPlayerTracker.java
new file mode 100644
index 0000000..1f33cae
--- /dev/null
+++ b/core-bukkit-impl/src/main/java/de/kentoj/scrow/bukkit/region/RegionPlayerTracker.java
@@ -0,0 +1,28 @@
+package de.kentoj.scrow.bukkit.region;
+
+import de.kentoj.scrow.bukkit.region.impl.Region;
+import org.bukkit.entity.Player;
+
+import java.util.*;
+
+public class RegionPlayerTracker {
+
+    private final Map<UUID, List<UUID>> playersInRegion = new HashMap<>();
+
+    public void registerInRegion(Region region, Player player) {
+        playersInRegion.computeIfAbsent(region.getUuid(), __ -> new ArrayList<>())
+                .add(player.getUniqueId());
+    }
+
+    public void unregisterInRegion(Region region, Player player) {
+        var uuids = playersInRegion.get(region.getUuid());
+        if (uuids == null) return;
+        uuids.remove(player.getUniqueId());
+    }
+
+    public boolean isInRegion(Region region, Player player) {
+        var uuids = playersInRegion.get(region.getUuid());
+        if (uuids == null) return false;
+        return uuids.contains(player.getUniqueId());
+    }
+}
diff --git a/core-bukkit-impl/src/main/java/de/kentoj/scrow/bukkit/region/RegionTask.java b/core-bukkit-impl/src/main/java/de/kentoj/scrow/bukkit/region/RegionTask.java
new file mode 100644
index 0000000..3a228cf
--- /dev/null
+++ b/core-bukkit-impl/src/main/java/de/kentoj/scrow/bukkit/region/RegionTask.java
@@ -0,0 +1,36 @@
+package de.kentoj.scrow.bukkit.region;
+
+import de.kentoj.scrow.bukkit.ScrowAPI;
+import de.kentoj.scrow.bukkit.region.event.RegionJoinEvent;
+import de.kentoj.scrow.bukkit.region.event.RegionLeaveEvent;
+import de.kentoj.scrow.bukkit.region.impl.Region;
+import lombok.RequiredArgsConstructor;
+import org.bukkit.Bukkit;
+import org.bukkit.scheduler.BukkitRunnable;
+
+@RequiredArgsConstructor
+public class RegionTask extends BukkitRunnable {
+
+    private final RegionPlayerTracker playerTracker;
+
+    @Override
+    public void run() {
+        for (var player : Bukkit.getOnlinePlayers()) {
+            var regions = ScrowAPI.getRegionManager().getRegions(ChunkPos.fromChunk(player.getLocation().getChunk()));
+            for (Region region : regions) {
+                var tracked = playerTracker.isInRegion(region, player);
+                var inside = region.isInRegion(player.getLocation());
+                if (!tracked && inside) {
+                    var ev = new RegionJoinEvent(region, player);
+                    Bukkit.getPluginManager().callEvent(ev);
+                    if (!ev.isCancelled()) playerTracker.registerInRegion(region, player);
+                } else if (tracked && !inside) {
+                    var ev = new RegionLeaveEvent(region, player);
+                    Bukkit.getPluginManager().callEvent(ev);
+                    if (!ev.isCancelled())
+                        playerTracker.unregisterInRegion(region, player);
+                }
+            }
+        }
+    }
+}
diff --git a/core-lib/build.gradle.kts b/core-lib/build.gradle.kts
index 88a6835..2952630 100644
--- a/core-lib/build.gradle.kts
+++ b/core-lib/build.gradle.kts
@@ -1,6 +1,7 @@
 plugins {
     id("java")
     id("maven-publish")
+    id("de.kentoj.scrow.scrow-repository")
     id("de.kentoj.scrow.base-dependencies")
     id("de.kentoj.scrow.database")
     id("de.kentoj.scrow.java-library")
diff --git a/core-velocity-api/build.gradle.kts b/core-velocity-api/build.gradle.kts
index cd798f2..b1c24bb 100644
--- a/core-velocity-api/build.gradle.kts
+++ b/core-velocity-api/build.gradle.kts
@@ -37,4 +37,4 @@ publishing {
             from(components["java"])
         }
     }
-}
+}
\ No newline at end of file