The Orruks are the greenskin embodiment of war, a race that exists only to smash, stomp and conquer. They spring from the spores of the beast-realm Ghur and grow larger and stronger the more they fight, their very muscle swollen by the raw power of the twin-headed god Gorkamorka. To an orruk, peace is a sickness and battle the only true worship.
They gather into vast, roving hordes under the banners of the Orruk Warclans, where the cunning-brutal Kruleboyz lay traps in the swamps and the mighty Ironjawz charge headlong into any foe large enough to be worth the effort. The bigger and meaner an orruk grows, the more the others follow him, for strength is the only law they recognise and the only argument that ever ends a dispute.
Where the orruks march, the ground shakes and the sky fills with the din of the Waaagh! — a psychic tide of collective fury that drives them to ever greater feats of destruction. They cannot be reasoned with, bought off, or truly exterminated, for wherever conflict festers, new spores take root. To the free peoples they are an apocalypse of muscle and iron; to themselves, they are simply having the time of their lives.