The Citadel of Eight was formed at some point after 561 CY and was dissolved in 569 CY. Its initial membership was Mordenkainen (its founder) and Bigby, his apprentice. The two decided to form a group to maintain the balance between the extremes of Oerth. They recruited Robilar, Riggby, Yrag, Tenser, Serten, and Otis. The name of the group was based on their number and Mordenkainen's Obsidian Citadel. The group eventually disolved for ideological reasons (in the case of Robilar and Otis), because of grudges between members (such as Tensor, who blamed Mordenkainen for the death of Serten), or because of outright death in the case of Serten, who fell in 569 fighting against the hordes of evil.
