Tiamat, the World Dragon, is a member of the Obsidian Pantheon and was one of the Twelve Gods. Created by Bahamut and the first to be banished beyond the Divinity Cascade long before any other gods were, she is an almost-unparalleled force of malice and destruction. Whereas Garatz enjoys destruction for the sake of chaos, Tiamat actively plots and plans to work as much evil as she can across the world. Her many heads have mastery over many forms of magic, and she wrote the first curses to befall mortals in the realm.

She hates all of the other deities, especially Bahamut and Syl for their perceived betrayal of her. Those with grievances, legitimate or otherwise, frequently find themselves drawn into her cults.