diff --git a/src/main/java/org/auioc/mcmod/arnicalib/api/game/registry/RegistryEntryException.java b/src/main/java/org/auioc/mcmod/arnicalib/api/game/registry/RegistryEntryException.java
new file mode 100644
index 00000000..ad8310f3
--- /dev/null
+++ b/src/main/java/org/auioc/mcmod/arnicalib/api/game/registry/RegistryEntryException.java
@@ -0,0 +1,34 @@
+package org.auioc.mcmod.arnicalib.api.game.registry;
+
+import org.auioc.mcmod.arnicalib.api.java.function.ThrowableSupplier;
+
+public class RegistryEntryException extends RuntimeException {
+
+    public static final ThrowableSupplier<RegistryEntryException> UNKNOWN_ITEM = (id) -> () -> new Unknown("item", id);
+    public static final ThrowableSupplier<RegistryEntryException> UNKNOWN_BLOCK = (id) -> () -> new Unknown("block", id);
+    public static final ThrowableSupplier<RegistryEntryException> UNKNOWN_ENTITY_TYPE = (id) -> () -> new Unknown("entity type", id);
+    public static final ThrowableSupplier<RegistryEntryException> UNKNOWN_MOB_EFFECT = (id) -> () -> new Unknown("mob effect", id);
+    public static final ThrowableSupplier<RegistryEntryException> UNKNOWN_POTION = (id) -> () -> new Unknown("potion", id);
+    public static final ThrowableSupplier<RegistryEntryException> UNKNOWN_SOUND_EVENT = (id) -> () -> new Unknown("sound event", id);
+
+    public RegistryEntryException(String message) {
+        super(message);
+    }
+
+    public RegistryEntryException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+    public RegistryEntryException(Throwable cause) {
+        super(cause);
+    }
+
+    public static class Unknown extends RegistryEntryException {
+
+        public Unknown(String type, String id) {
+            super("Unknown " + type + " '" + id + "'");
+        }
+
+    }
+
+}