Ostoth was a mage of some repute at the Tower of Magi. He had a reputation for being particularly cold and impersonal. During the Empire-Avernum War, he and Enla tried to extract information from Motrax. He also discovered the portal coordinates for Angierach. During the plagues of Valorim, he was in charge of the Bunker, where he worked with Enla and Pathass, researching innovative magical weapons.