"Eitrigg is an aging orc warrior who served with valor and distinction during the First and Second War, losing two sons to battle. After he learned the truth of Gul'dan's betrayal and his bargain with Kil'jaeden, Eitrigg fled into the wilderness of Lordaeron, forsaking his race and determined to live out the rest of his days in peace.
He was discovered years later living in the ruins of an abandoned watch tower by the paladin Tirion Fordring. At first regarding each other as nothing but enemies, the two began to fight one another. Their fight caused the tower to collapse, and Eitrigg ended up saving unconscious Tirion's life by pulling him out of the ruins. From that point forward, Tirion felt he owed a debt of honor to the orc.
This was not enough to prevent Eitrigg from being captured however. It is certain that the orc would have been put to death in Stratholme but thanks to the timely intervention of Tirion and Thrall's new Horde, he was saved. He regarded Tirion as his human brother after such losses to save him.
After meeting Warchief Thrall, Eitrigg found that his people had rediscovered their shamanistic roots, and returned to life among his own kind. Before he left with his people, Eitrigg proclaimed that Tirion and he were brothers, bound by blood and honor."