The arte of performing miracles. Spells and rituals of this practice quite literally break the known rules of the world. Such as bringing the dead back to life, changing water to wine, or bringing down a pillar of searing light in the pitch dark of a cave.
The cost of these miracles is based on the edicts of the worker’s patron. The practitioner is expected to lead a life dedicated to the teachings of their patron and in return the patron lends their power in times of need.
However, if the patron allows, the practitioner may incur a sort of karmic debt should they need a greater miracle than their past faith has earned. If the deity or spirit sees the purpose of the miracle as worthy of their power, then they will not deny their follower. But in return the follower must peform some sort of penance, else they be destroyed outright for their blasphemy.