Acanthio Voxel

Once a respected Master of the Mage's Tower known as Master Acanthius, the man born as Acanthio Voxel was seduced by the Demon Prince Zenn Isaak and subsequently banned by the Mage's Tower for the practice of dark magic. Distraught, Acanthio sought his refuge with the Demon Prince, who received him with open arms (and open legs, if the stories are to be believed). Zenn magically enlonged his life and gave him access to the Black Library, which hosted an infamous collection of tomes on all kinds of dark magics, and after decades, nay centuries of study Acanthio Voxel has perhaps become the most dangerous mage alive today, though not many still remember his existence.