Exorcism

As it sounds this is the ability to mentally drive a possessing entity from the possessed victims body. A fully successful exorcism expels the entity and sends it to it's home dimension, a partial success drives the entity from the host but the entity stays in this world, a failure means the victim is still possessed.
During the exorcism the entity may attack in any way it can. If driven from the body it may also attempt to possess the Exorcist.

Related School

Xeno-biopsionics (ΨΞβ)