This deformed strange demon is called Draemaskul. It is a doppelganger, as the magical demonic links it is made of allows it to shapeshift to whatever it wants to.

On its natural form, it is horribly ugly, with deformed body parts. Just its appearance is enough to scare off normal people.

No one knows who built it, but its rather obvious that it was made by other demons, so as to have one more loyar servant to their cause.