Leedra Black the Illusionist
According to historical records, Leedra Black, along with Thinwhistle the Humble and the Amber Dragon, was one of the only Master Wizards to be stilled but not executed by the High Tribunal called after the fall of the Jade Tower. She committed suicide in her cell, not hours after her power was burned from her.
If the account of the Amber Dragon, he claims that there were 51 Master Wizards who volunteered for service, as a diversion while the rest escaped. If that is true, then Leedra Black was a volunteer, and a hero to the Arcanists.