The Jack In The Box trap is a trap that looks like a magical item. When Imps try to take it, it jumps up and scares them to death. Then it becomes the Jack creature, which heads directly for the Dungeon Heart. Once there, it explodes and damages the heart and any creatures nearby. The trap is not activated by any other creature, so they will likely destroy it easily. It can also be destroyed as it is running to the Heart, so it may be difficult to hit. As the Jack cannot attack, it cannot pass through enemy doors, and will stand there until it is destroyed.