Ahn'kahet: The Old Kingdom (also referred to simply as Ahn'kahet or The Old Kingdom) is an instance located in the Dragonblight on the icy continent of Northrend. The huge underground city serves as home to remnants of the once magnificent Nerubian Empire.
The area known as the Old Kingdom lies deep below the surface of Northrend, and is the original location of Azjol-Nerub. The nerubians preferred to stay well below surface level. This area has not been well maintained because the Scourge had not descended this far until very recently. By the same token, that meant they hadn't looted as much either. It was easier to avoid the Scourge by staying to these lower levels. Most of the nerubian rebels lived down here, though with the recent Scourge incursion it is unknown if they still survive.
On heroic, it awards approximately 2300 reputation.
Aura of Lost Hope (reduces max health by 3%. Stacks seemingly an infinite amount, max stack seen is 11) and Contagion of Rot (Disease, Reduces attack/cast speed, and has a chance to spread to allies when hit)