>>715719152Not sure about Mai specifically but for most other characters in Blazblue, powerful grimoires end up affecting the users in various ways unless they're just uniquely strong willed. For example: Tsubaki's Izayoi has the power to steal and weaponize light. The counter is that it makes her go blind over time. Jin's Yukianesa permits him to control and weaponize ice and frost. In return it severely amplifies his emotions, which is why he seemingly randomly goes from barely emoting at all to raging lunatic on a dime. This is to say nothing of the Boundary itself which always fucks with anyone who touches it in random but almost always negative ways.
I don't know how Mai specifically was affected though.