Chaos orcs (a.k.a. fel orcs) are orcs that drank from Mannoroth's Chaos Well in Ashenvale Forest and became corrupted. They were orcs of the Warsong clan that followed Grom Hellscream's decision to drink from the well to gain power in order to defeat Cenarius and his forces (Shadowleaves, Moonhunters, and Nightblades). By drinking from the well, they were further corrupted with more of Mannoroth's blood, turning red and growing larger. Chaos orcs were capable of causing special damage known as chaos damage. Chaos orcs were units seen in the Warcraft III: Reign of Chaos orc campaign.