The Changed Forest: The Unnerving Revelation

The group quickly moved after they had killed the corrupted bear. Corin glanced at the bear, and the blood that flowed out of it, and felt repulsed, his instinct to drink blood and his previous thirst gone.

The corruption had tainted the bear, and because of that, every part of its body had traces of it, the blood and soul having most of the corruption. As vampires, they drank the blood of most beings, such as monsters, elves, humans ... but some blood was not allowed, their bodies could not take it.

The blood of demons, for example, was a weird one. Depending on what type of demon it was, a vampire could indeed drink the blood to gain some benefits, but even then, it was dangerous as the blood was different, the power contained within it much more violent than any other.