Geryon

Geryon was an archdevil in the Nine Hells, before being ousted from his position as ruler of Stygia. Later, Geryon returned, and sought to reclaim his layer from Levistus. Geryon made his home in the fortress of Coldsteel, and commanded a number of ice devils, as well as minotaurs he had stolen from Baphomet.

Appearances

 * Elminster in Hell