Often called "the spirit of bloodlust and vengence," Halel is a spirit attributed with both being a demon and the first vampire (or reason they exist). According to vampire mythology, Halel was a spirit who "took a man at his death." Not much past this is known among vampires about who or what Halel is. In the Fallen Sourcebook, The Devils of Hell, Halel is attributed with being one of the only demons to escape Tartarus and remain on earth, with his children. Other demons are notably jealous of this power since it is commonly believed there is no escaping the watchful eye of Kerubiel, the prince of Heaven ruling in the stead of God.