Ahn'kahet: The Old KingdomIntroduced in Wrath of the Lich King
Azjol-Nerub was an empire of great strength when the Lich King arrived in Northrend. Despite ferocious resistance, however, Scourge forces managed to overtake the subterranean kingdom and slaughter its inhabitants, the nerubians. Scarred by years of war and abandonment, this vast domain is now occupied on two fronts.
In the Upper Kingdom, undead nerubians patrol the ruins of their homeland, guarding clutches of eggs that will one day bring forth a new generation of Scourge warriors. Meanwhile, in the depths of the Old Kingdom, Ahn'kahet, another enemy stirs: the faceless ones. Little is known of these horrifying creatures, but rumor has it that they answer to an evil power lurking beneath Northrend. Destroying the undead nerubians and their tainted eggs will deal a great blow to the Lich King, but eliminating the mysterious faceless ones is also crucial to reclaiming the fallen empire.