Invalid Entity

The entity is not part of vanilla Minecraft and does not spawn naturally anywhere, so players bring it into the world by summoning it with a command. The summon command takes the invalid entity id, and a separate Steve-type variant can be summoned with its own id. The creature is neutral: a single hit draws its attack, and it is meant to be used in survival as a challenge rather than as an ordinary passive mob.

The mod also registers a spawn egg, an invalid block, an invalid biome, an invalid fluid with a bucket, and the matching item and entity names used across the game files. Because the entity can be placed through commands and edited with an NBT editor, the mod is typically used by players who want an unusual encounter. The author notes that the entity can be pushed past the world boundary by editing its position, though the game still treats the coordinates as invalid.