User blog comment:Twilight Despair 5/Supernatural Failures/@comment-24169020-20130623233830/@comment-1509826-20130624200433

Edgar actually says that as a son of eve the vampires barely come from them, and refers to Eve as a "Mutt" as in she has part of them in her, but isn't pure leviathan. Besides I'm pretty sure the agreement is the companion guide is canon unless it disagrees with the show.