Overlord is the closest I can think of? Don’t think its quite what ur looking for tho…
Trying to think of any but none stay fighting humans, and normally it isn’t cus they hate humans but more of just that faction.
The closest one I can think of is “Book of the dead”, guy gets a forbidden class and is forced to lose it or die, ends up having to go on the run. His nice at the start but currently in book 2 his gotten to the point where he would slaughter a village if it meant getting closer to his goal, which is pretty much destroying everything which decided he had to die.
Also has dark gods and cuthulu aspects.
