Chamber of the Stars
Chamber of the Stars is a large chamber located beneath the Obelisk of the Stars in Uldum. It contains the activation device for the aforementioned Obelisk. The chamber itself is guarded by four titanic constructs and several spirits of the dead.
The chamber is filled with the skeletal remains of would-be tomb robbers, that just didn't bring enough rope to get out. The corpse of a Schnottz Scout can also be found here.
The Obelisk and Chamber of the Stars have been occupied by the Amathet, a group of tol'vir who believe only they can protect the titans' works. They have activated a solar device here known as the Engine of Ascension, which will activate Reply-Code Omega and use the Forge of Origination to wipe out the Old Gods - as well as all other life on the planet.