Drak'Tharon Keep contains 1 instance for level 74-76 players. Like Blackrock Mountain, Drak'Tharon connects two zones (the Grizzly Hills and Zul'Drak) in the northwest and southwest corners, respectively.
The undead Drakkariice trolls have begun pouring from their stronghold of Drak'Tharon Keep, and are assaulting the furbolg. The invasion is oddly credited to the Drakkari themselves, not the Scourge.
The Scourge controls Drak'Tharon Keep in the Grizzly Hills, just south of Zul'Drak's southwest corner.(LoM 176) This ancient stone citadel once belonged to the Drakkari trolls. The Drakkari built Drak'Tharon Keep before the furbolgs built Grizzlemaw. The Frostpaws gathered the tribes together in part to fend off the new Drakkari threat. Both races hated each other; with the new keep the Drakkari were more organized, and the trolls were more unified than the furbolgs, even though the furbolgs had greater numbers. The existence of Grizzlemaw affected the balance, and the furbolgs' victory over the Drakkari in a series of skirmishes may have led to the eventual loss of Drak'Tharon to the Scourge. The Scourge ultimately drove them out and took possession, and now the Scourge has a garrison here holding the mountain passes. It's a well-placed, solidly-built structure, and the small group of undead within can easily hold the keep against forces ten times its size, particularly since they don’t need food or water during a siege.(LoM 102, 104) Two thousand Scourge creatures patrol the ruined old keep. They often fight Drakkari and occasionally furbolgs, though they have yet to attack either Gundrak or Grizzlemaw directly.(LoM 177) Armed Scourge patrols wander the countryside, scaring anyone they meet. These patrols either attack living people or act menacing to frighten them away.(LoM 176)
The keep itself is located in the icy northlands of Northrend, in the northwestern part of the Grizzly Hills. It is an ancient ice troll stronghold that has since been claimed by the Scourge. The undead control passage into the lands beyond from here.