Rexxar used his new position to ask the ogres for assistance. Kor'gall mockingly reminded him that they were no longer friends to the orcs. Rexxar was forced to fight Kor'gall for leadership of the clan. Kor'gall proved to be a powerful foe, and Rexxar had to rely heavily on his beast friends to defeat him. Finally, Kor'gall fell and Rexxar assumed the position of chieftain. He then led the Stonemaul ogres back to Tidefury Cove where Thrall was assembling the Horde. Thrall named Rexxar Champion of the Horde and gave him the honor of leading the Horde against Proudmoore's forces. After a difficult battle, they razed Proudmoore's stronghold and sent the Admiral into a retreat. Yet, Thrall knew that Proudmoore would not stop there.
The Horde pursued Proudmoore back to the shores of Theramore Island. Thrall sent in his foot soldiers to keep Proudmoore's forces at bay while Rexxar and his few companions wove through the battle to face off against Proudmoore and his most loyal retainers. In the end, Rexxar and Proudmoore squared off in mortal combat. Rexxar emerged victorious. With Proudmoore's defeat, the battle ground to a halt and Jaina collapsed onto the body of her father. Rexxar, Thrall, and the rest of the Horde withdrew from Theramore.
Thrall invited Rexxar to return to Durotar with him, but Rexxar told him that his place was still in the wild. He named the ogre Mok'Morokk as the new leader of the Stonemaul clan and disappeared into the barren wilderness.