Bifrons

In Solomonic Literature, Bifrons is an evil spirit that appears in a haunting form, yet able to look human as its magician master sees fit. A unique demon who knows astrology and arithmetic very well, but also has a darker power that deals with necromancy. Aside from the intelligence in numbers and logic, Bifrons can command the dead, change their looks, transport them to any place to terrorize. Half of the "people" in your city could be corpses under Bifrons' spell, dead people walking—that could be you—and no one would know. A strange and horrifying demon that King Solomon had under his control.