The Lower City Reputation Faction being situated in Shattrath, has much to offer to Players. Apart from the Auchenai Key, which grants access to the Heroic versions of the four Auchindoun Dungeons, there are quite a few cool items available!
As with most of these Dungeon Factions, you can easily get the Lower City Rep up to exalted by just farming Dungeons. The Sethekk Halls and Shadow Labyrinth even give Reputation all the way to exalted on normal mode, though you should try to run Heroics once you reach revered. Here’s all the ways to gain Lower City Rep in one image: