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"Mystery and speculation surround the corrupted fel orcs who recently appeared in Outland. Though little is known about these savage warriors, the most disturbing revelation to come to light is that their numbers appear to be steadily increasing. Even more perplexing is the fact that the orcs have discovered some alternate source of fel energies to feed upon, despite the slaying of Mannoroth and the Horde's subsequent release from demonic corruption. Regardless of their connection to fel energies, however, it is believed that this new breed is not working with the Burning Legion. What authority they do answer to remains a mystery."
The only instance in which fel orcs were active on Azeroth was during the Third War. Mannoroth tricked Grom Hellscream and his Warsong warriors into drinking his blood from a tainted fountain of health. Grom later overcame the blood haze with the help of Thrall and Jaina Proudmoore and slew Mannoroth, thus freeing both the fel orcs and the orcs that had been corrupted by Manoroth on Draenor.
When the pit lord Magtheridon took control of Outland, he created fel orcs by corrupting them with his blood. Fel orcs made up the backbone of Magtheridon's armies. After Magtheridon was defeated by Illidan and imprisoned, the fel orcs stayed in Hellfire Citadel, keeping guard over the captured pit lord. This is the first known appearance of the fel orcs. They no longer serve the Burning Legion but follow Illidan instead. Illidan has continued using the blood of Magtheridon to create more fel orcs to follow him. A letter recovered from one of the orcs has revealed that Illidan is not pleased with the orcs' progress with the defense of the Blood Furnace.
It also seems they are experimenting on captured Mag'har orcs to create fel orcs.
Caza'rez of the Horde is working on a cure for the fel orcs converted by the Illidari.
A group of the Dragonmaw clan members broke off from the Legion and were independent. They were fel orcs.
Fel orcs from the Dragonmaw clan came from Outland to and enslave the rest of the Dragonmaw on Azeroth. They are later defeated by the Horde to help free the rest of the clan.
Warlords of DraenorEdit
Gul'dan is given blood from an unknown demon and offers it to Grom Hellscream's Iron Horde one more time. Grom and most of his followers decline, but Kilrogg Deadeye, a mag'har orc, drinks the blood and transforms into a fel orc. Gul'dan then describes him as the "might of the [Burning] Legion".
Fel orcs have red to orange-red to purple-red skin. They have a ridge of long sharp spines coming out of its back. Bony horns grow from its arms and hands. Its eyes are bloodshot and glow red, and six long and thin fangs grow out of its mouth. Its ears are stubbier than orc ears, coming to a blunt point. Most fel orcs have lived for years in Outland with the corruption, and this has led to the greater mutations.
(To Be Added)