The monster wants only to kill. The monster can not die, and recovers instantly. It can not be stopped. It can not be reasoned with. It knows no fear. The monster is unbeatable by any force. It is immune to all magic, all forces, and poisons/drugs/potions. It can not be trapped, because it can teleport. The monster can break unbreakable things, escape inescapable things, and kill unkillable things. The monster will never accept peace. The monster can never give up. The monster can not lose.