The Symbiote demon is a demon that has not yet adopted its respiratory system to that of the human realm. So it gets humans and offers them great power at the cost of using their respiratory system. With this they get great power and use it to fulfill their most hedonistic needs. The intelligence of a human and the wrathful rage of a demon make this a very powerful adversary.
Version 2: 29 Apr 13
Decided that a few back blades would do a great job making the whole thing look much more menacing