Tempest Keep is a former Naaru fortress in the Netherstorm in Outland. This crystalline fortress is now ruled by Kael'thas Sunstrider, the lord of the blood elves, and dominated by scores of his brethren. The structure is divided into three wings in the skies--satellites of the gigantic structure--with the fourth wing, the Exodar, now in the world of Azeroth as the Draenei capital.

The Arcatraz houses four demonic bosses that must be defeated by parties seeking to stop Sunstrider. The dungeon used to require an arduous attunement method to gain access to its prison corridors, but that was removed with previous patches.