Dark Priest

There are many different tales and types of Dark Priests told around the world. Some are mages masquerading under faux religion, others are ghostly apparitions of dead priests who died in great sin, while yet more are of satanic priests, vampyres, Necromancers and more.
Most tales describe Dark Priests clad in full ecclesiastical regalia, with flowing black robes and even hoods. Their Latin chants summon spells and their perverted rituals breed demons and summon monsters to earth to do their bidding. 
Altogether, not your Sunday parish priest by any means...