Cain

Cain is a demi-god who instead of having woshipers, used a killing spell that would steal a mortal victim's soul and utilize its Essence to give him power. It is uncertain where he attained the knowledge of how to perform this spell, but it was long though to be some sort of bargain he had made with Mephisto.

He finally became a demi-god after his successful channeling of the Gloomhold spell and remains in constant rivalry for the title of God of the Undead with Orcus.