Amid the Scourge's invasion of Azjol-Nerub, many of the kingdom's denizens tunneled underground to escape the Lich King's minions. Yet some of them dug too deep, exposing the tendrils of Yogg-Saron. Roused by this disturbance, the entity has sent one of its most ancient warriors - Herald Volazj - to cull the beleaguered nerubians and annihilate anyone foolish enough to threaten the Old God.