diff --git a/common/src/main/java/com/sunekaer/toolkit/commands/level/KillEntitiesCommand.java b/common/src/main/java/com/sunekaer/toolkit/commands/level/KillEntitiesCommand.java
index a29815f..97fa704 100644
--- a/common/src/main/java/com/sunekaer/toolkit/commands/level/KillEntitiesCommand.java
+++ b/common/src/main/java/com/sunekaer/toolkit/commands/level/KillEntitiesCommand.java
@@ -4,6 +4,7 @@
 import com.mojang.brigadier.context.CommandContext;
 import com.mojang.brigadier.exceptions.CommandSyntaxException;
 import com.mojang.serialization.Codec;
+import com.sunekaer.toolkit.Toolkit;
 import net.minecraft.commands.CommandBuildContext;
 import net.minecraft.commands.CommandSourceStack;
 import net.minecraft.commands.Commands;
@@ -13,6 +14,8 @@
 import net.minecraft.core.Holder;
 import net.minecraft.core.registries.Registries;
 import net.minecraft.network.chat.Component;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.tags.TagKey;
 import net.minecraft.server.level.ServerLevel;
 import net.minecraft.util.StringRepresentable;
 import net.minecraft.world.entity.Entity;
@@ -30,6 +33,10 @@
 import java.util.function.BiPredicate;
 
 public class KillEntitiesCommand {
+    public static final TagKey<EntityType<?>> KILL_PROTECTED = TagKey.create(
+            Registries.ENTITY_TYPE,
+            ResourceLocation.fromNamespaceAndPath(Toolkit.MOD_ID, "kill_protected"));
+
     enum KillType implements StringRepresentable {
         all((p, entity) -> !(entity instanceof AbstractMinecart) && !entity.getUUID().equals(p.getUUID())),
         animals((p, entity) -> entity instanceof Animal),
@@ -83,7 +90,7 @@ private static int killByEntity(CommandContext<CommandSourceStack> context, Hold
         EntityType<?> entityType = reference.value();
 
         source.sendSuccess(() -> Component.translatable("commands.toolkit.kill.start", entityType), true);
-        var entitiesKilled = yeetEntities((player, entity) -> entity.getType().equals(entityType), level, source.getPlayerOrException());
+        var entitiesKilled = yeetEntities((player, entity) -> entity.getType().equals(entityType), level, source.getPlayerOrException(), false);
         yeetedEntitiesMessage(source, entitiesKilled, entityType.toShortString());
 
         return 0;
@@ -102,7 +109,7 @@ private static int kill(KillType type, CommandSourceStack source) throws Command
                 entitiesKilled++;
             }
         } else {
-            entitiesKilled += yeetEntities(type.checker, level, source.getPlayerOrException());
+            entitiesKilled += yeetEntities(type.checker, level, source.getPlayerOrException(), true);
         }
 
         yeetedEntitiesMessage(source, entitiesKilled, typeName);
@@ -118,7 +125,7 @@ private static void yeetedEntitiesMessage(CommandSourceStack source, int yeetedA
         }
     }
 
-    private static int yeetEntities(BiPredicate<Player, Entity> tester, ServerLevel level, Player player) {
+    private static int yeetEntities(BiPredicate<Player, Entity> tester, ServerLevel level, Player player, boolean respectProtection) {
         int entitiesKilled = 0;
         Iterable<Entity> entities = level.getAllEntities();
 
@@ -131,6 +138,10 @@ private static int yeetEntities(BiPredicate<Player, Entity> tester, ServerLevel
                 continue;
             }
 
+            if (respectProtection && entity.getType().is(KILL_PROTECTED)) {
+                continue;
+            }
+
             if (tester.test(player, entity)) {
                 entity.remove(Entity.RemovalReason.KILLED);
                 entitiesKilled ++;
diff --git a/common/src/main/resources/data/toolkit/tags/entity_type/kill_protected.json b/common/src/main/resources/data/toolkit/tags/entity_type/kill_protected.json
new file mode 100644
index 0000000..76187ef
--- /dev/null
+++ b/common/src/main/resources/data/toolkit/tags/entity_type/kill_protected.json
@@ -0,0 +1,6 @@
+{
+  "replace": false,
+  "values": [
+    { "id": "aeronautics:propeller_bearing_contraption", "required": false }
+  ]
+}
diff --git a/neoforge/build.gradle b/neoforge/build.gradle
index 4eee266..4ce771d 100644
--- a/neoforge/build.gradle
+++ b/neoforge/build.gradle
@@ -8,6 +8,9 @@ architectury {
 }
 
 repositories {
+    maven {
+        url "https://maven.neoforged.net/releases"
+    }
     maven {
         url "https://maven.saps.dev/mirror"
     }