"In demonology, Bifrons is a demon, Earl of Hell, with six legions of demons (twenty-six according to other authors) under his command. He teaches sciences and arts, the virtues of the gems and woods, herbs, and changes corpses from their original grave into other places, sometimes putting magick lights on the graves that appear like candles. He first appears as a monster, but then changes his shape into that of a man."
So, here is my version of Bifrons. She appears in the novel I'm writing ^^
She can revive the dead to assist her and shoot green flames.