The Age of Worms
A mind flayer who dominated Imron Gauthfellow and had the wizard try to assassinate the party on orders from Loris Raknian. His lair was situated in the Greyhawk sewers beneath the Cold Forge. There he kept drow and mind flayer minions and a bevy of octopins. He was slain by the party after a long battle in his lair, after which they found evidence that he had obtained the Apostolic Scrolls for Raknian in addition to the assassination attempt.