A devil (also known as a baatezu) is a fictional character in the Dungeons & Dragons roleplaying game, a powerful group of monsters used as a high-level challenge for players of the game. Devils are Lawful Evil in alignment and originate from the Nine Hells of Baator. True to their Lawful Evil alignment, devils are locked in a strict and brutal hierarchy (changing form as they work their way up the ladder of power). At the top of the hierarchy are the supreme Archdevils, or Lords of the Nine, who are the rulers of the different regions of Baator. Devils often see the various worlds in the D&D metacosmos as tools to use for their own ends, including prosecuting the Blood War, a millennia-long war between the devils and their arch-enemies, demons.