Voltarus is a Scourge necropolis located in northwestern Zul'Drak, near the border with the Storm Peaks. Voltarus is the headquarters of Drakuru, the Scourge overlord of Zul'Drak. Here he is creating a secret weapon in his efforts to conquer all of Zul'Drak for the Scourge.
The second floor can only be visited during a few quests players receive from Drakuru. The transporter will stop working after the chain is completed.