Double Trouble is a monster spell specific to the Wizard of Yendor. As the name suggests, if this spell is cast and there is only one Wizard in the dungeon, he will clone himself. The clone has a 50% chance of being created with a cheap plastic imitation of the Amulet of Yendor and will temporarily take on the appearance of a random monster (like a mimic, but with monsters) before its first move. (This leads to the odd message Wait! That's the Wizard of Yendor! if one attempts to move onto the tile occupied by the clone before it attempts to attack).