in the something's rotten quest, where you are trying to find and kill the demon that is possessing Kelton, the skeleton in the basement of the healers guild, it is possible to mind read Ezzazh, the demon, and find that his blood may have benefitial properties for mortals: i.e. you can choose to drink his blood instead of giving it to kelton and saving him.
I have done this but I cant tell if the blood has had any effect at all. The narration says that it was "nasty, but not without effect" and your body glows when u drink it briefly. It doesnt seem to give skill points, stat boosts, or exp. points. Wtf.
Anybody know what drinking the demon blood does?