Camus Peligor runs Peligor Corp these days, but she's best known in magus circles for her time as a student under Kayneth El-Melloi Archibald back in the 1990s. Things took a dark turn when she got attacked by a Griffin—the incident left her scarred and tanked her Magic Circuits hard enough that the Clock Tower kicked her out. This happened around the same time Kayneth died, though whether there's a connection is unclear. Some suspect her former classmate Amleth Wotan had something to do with it, either deliberately or by accident, but it's never been confirmed.
Content compiled by AnimeList.moe from publicly available sources.
