This sounds quite a lot like a mix between Lich and Swarm. On Lich path in WOTR you can be very damn horrid to the point of some companions leaving you or dying (or making some companions through also terribly awful things as can be seen with Ciar). You end up in complete isolation in you new state surrounded by the true blessing Zacharias talked about, "Silence". While Swarm is devour all path that ends with you being completely alone with no other purpose than to feed your never ending hunger. I do wonder how depraved you can get because stuff in WOTR was already pretty damn horrid like can be seen with how you can change certain companions. I also wonder if evil in this game will be just about this kind of so horrid evil, because what I like in WOTR is that they presented all kinds of evils and purpose behind each with their paths and complexity of evil. Lich being one that can go in different directions depending on who you support, who you don't and how are you going to use your power and much are you ready to sacrifice for it.
