http://www.worldofwarcraft.com/burningcrusade/townhall/karazhan.html
10 man lvl 70 instance.
Forge a group of ten stalwart adventurers and journey to the wasted land between Duskwood and the Swamp of Sorrows known as Deadwind Pass, where the mystical tower lies. Only the strongest need apply: only those who have achieved level 70 are skilled enough to face what lies within.
10 man lvl 70 instance.