Adonides

Adonides was a devil from Cania who visited the Material Plane after the Puncture. His objective was to convert former wizards at Wayreth Tower into warlocks, who relied on devils (most likely Mephistopheles, lord of Cania) for their power. The Order of the Black Robes took him up on the deal; Justarius also permitted his red robes to accept Adonides' terms, and some of them did. What most of these wizards did not realize was that because they had given Adonides nothing in exchange for their power, Adonides was not bound to keep his half of the deal. He could revoke their powers arbitrarily. Ladonna is presumed to have known about this wrinkle, but did not share it with her order, to the outrage of some of the black robes. Seth Mase and his friends ultimately defeated Adonides in Wayreth Tower, which -- because the tower was magically sequestered at the time -- had the effect of truly slaying the devil and not permitting him to escape back to the Nine Hells.