The Rageroar clan is an orcish clan led by Karga Rageroar that is assaulting Northwatch Hold. The clan is defeated at the end of the questline Quest:Silencing Rageroar.
However, despite being beaten, the remnants of the clan were still strong enough to be a thorn in Admiral Aubrey's side. These remnants would later regroup with the rest of the Horde and join them in attacking Northwatch Hold.
The Rageroar clan is an original invention for the Cataclysm expansion, having never shown up in previous games or novels. It is currently the only orc clan to have been introduced in World of Warcraft and seems to have been created solely to act as antagonists for the Alliance quests at Northwatch Hold.