Apostate

Colloquially termed "evil priests" or "priests of Evil," members of the Apostate class are able to summon Baalzadeens and other demon companions, just as their holy counterparts can summon angels. Learning to control the skills of Evileye and Necromancy from a young age, apostates are deemed fit by Evil to wield the powers of Apostasy when they become strong and mature enough.

The events leading up to the creation of the Apostate class, and later the guild and House, can be found within the Blood Congregation article.