Ulduar is a dungeon hub located at The Storm Peaks of Northrend, revealing many details about the Titans and their activities.
In particular, Halls of Stone is controlled by storm giants and crystal golems.
These giants are a dying race desperately avoiding their fate, avoiding conflict with the Scourge.
Halls of Stone is a large 5 five-man dungeon, and is the first instance of the titan city Ulduar wing.