Magi Rampancy
Magi Rampancy (マギの暴走) is a condition that often befell 3rd-year Lilies and others from the Dueling Generation.
Magi Rampancy causes Lilies to go out of control in a fashion similar to how Boosted Lilies sometimes do. It was responsible for no small amount of fatalities, and the madness and destructive urges caused by it were one of the reasons why duel-focused education was abandoned[1].
One notorious incident caused by Magi Rampancy was when Tamura Nagi attacked and injured Watanabe Akane with her CHARM during the Sigrún election of 2051. She was only stopped from outright killing Akane by the timely intervention of Yamanashi Hibari and other Lilies. As she was not in her right mind, the student council almost allowed Nagi to go unpunished for this, but Hibari insisted that Nagi face some kind of consequence; this eventually lead to the dissolution of Legion Svanhvít.