Using the skills driven into him by his captors with his own natural strength and courage, Thrall escaped his wicked masters and, once free, set out to find his stolen heritage. Finding his kind forced to live passively in controlled settlements, the young warrior sought out the few, scattered Orc clans that managed to evade the wrath of the Alliance. From their camps in the harsh wilderness, Thrall swore to lead his brothers back to the status their heritage demanded. Under Thrall's leadership as the new Warchief of the Horde, the Orcs rediscover their abandoned Shamanistic culture and use this newfound power to revolt against their cruel wardens.

As civil strife rages through the nations of the Alliance, the lands of Azeroth undergo strange changes, and the threat of a new, unseen foe draws near. Finally, in an unholy firestorm from the heavens, the Burning Legion arrives. Cursed to roam the greater realms forever to consume the primal energies of magic to survive, the Legion has ravished world after world in its mad lust for arcane power. Cunning, sinister and seemingly unstoppable, these dark slayers come to not only drain this domain of its magic, but to eradicate all life within it, as well.