Yochlol

A shape changing demon, created by the souls of Elves captured within the abyss, these demonic elven demons are spider, slime Drow, and mist in one being. While the mist form appears thick, almost like a liquid smoke, but this is almost a disguise from its true demonic form which is a pillar of yellow slime with a single malevolent eye.

A Yochlol is poisonous to the touch, and can climb any surface, and is often used as spies by demonic lords, or others who would seek the services of a demon. One of the few demons, that while Chaotic Evil, is still somewhat able to be rationalized with, though often this is only to serve its own dark means.