Nobody knows quite where orruks came from. Warhammer Orruk Warclans are followers of Gorkamorka and are a part of the Grand Alliance of Destruction. The loud and brutal species shake the Mortal Realms as they punch, smash and slash any opponents they come across.
Orruks such as the Ironjawz are known to be rather unintelligent, however this has never held them back in crushing entire empires simply for the thrill of the fight. They thrive on war and use their great numbers, raw strength and brutality to win battles.