X-Men: Pixie Strikes Back #4

The X-Men battle Saturnine's demons in order to free Pixie from his influence. Pixie, however, is too busy cat fighting with her step-sisters, Regan and Martinique, to be of much help. After her siblings (and Emma) get slapped down, Pixie pulls a soul sword from her chest and her mother infuses it with fairy magic. Pixie then presents the magic sword to Saturnine and he kills himself trying to put it into his own chest (it was a fake soul sword). Pixie's mother insists that her real father was Jason Wyngarde, the original Mastermind, before leaving her once again in the X-Men's care.