The Fel Horde is a new term used by the Alliance and the Horde in Hellfire Peninsula, particularly in Hellfire Citadel, to describe the fel orcs living there (the fel orcs call themselves the "true horde"). It is believed that this is simply a new term for the Orcs of the Horde's clans affected by the demonic corruption that is being siphoned out of the pit lord Magtheridon. Magtheridon is now held captive by Illidan Stormrage, the new Lord of Outland — who uses the pit lord to corrupt more orcs to boost his growing army.