Built upon the ruins of the human city of Rin, the Black Citadel is the headquarters of the charr legions in Ascalon. Commanded by Smodur the Unflinching, Imperator of the Iron Legion, the great city is dominated by the huge metal-shod sphere at its center.
The Black Citadel is the headquarters of the Iron Legion. It is built upon the ruins of Rin in Ascalon, and is the closest charr capital to the other races. It is here that the Iron Legion mass-manufactures many items for the other legions and associated allies. These things include tanks, vehicles, armaments both mechanical and not, and things of that ilk. These items are tested and then deployed for use on the battlefield. The Bane, a large arena, can be found near the centre of the city. And overlooking the entire Black Citadel is the looming Imperator's Core, where the leadership can be found deliberating over charr affairs.
The city itself is governed by a set of pragmatic laws, which keeps it running like clockwork. These are enforced by the ever vigilant and efficient Adamant Guard. (Source)
By following this guide you will complete all the other objectives on the map in 20 minutes.