Kishin

Kishin are demon gods, created whenever someone consumes an exsessive amount of pure or uncorrupted souls. In the period of time between leaving the path of humanity and becoming pure Kishin, human like qualities are often lost to be replaced with strange and often hideous deformities. If a Kishin or Pre/Kishin soul consumes the soul of a witch, it is hinted that their power will become even greater, in a very similar manner to the way a weapon becomes a Death Scythe after collecting the soul of a witch.