A faction is a grouping of evil beings who all belong to the same species and sometimes have a political purpose. Known factions include; Furies, Grimlocks, Harpies, Warlocks, and so on, while Vampires were before their banishment. Also, a Warlock faction was formed by Devlin to overthrow the Source of All Evil, though most of them were later vanquished by the Charmed Ones.