Gregor

Gregor was the leader of a small coven mentioned in Proven Guilty.

History in Series
Charity Carpenter fell in with him when first found her magic as a teen and young woman. Gregor resented the White Council and their Wardens warning him and his little group of misfits to heed the Rules of Magic or risk execution. He went on to teach them things they should not have been doing, more on the darker side of magic.

several of his students started to vanish one by one. Gregor caught Charity seeing something she shoudn't have and chained her to a pole as an offering for the dragon Sirothrax in exchange for more magical power. Micheal Carpenter rescues Charity, slaying the Dragon. (Ch. 32, Proven Guilty)