This quest is not available in game.
Slay Arnokk the Burner and 10 Iron Horde troops within Karabor.
The majority of Karabor's defensive troops are dealing with the main battle front, just west of here. We must not ignore our flanks while dealing with that assault.
One of the enemy leaders, Arnokk, is directing the mayhem on this side of the temple. Take him out, along with as many of his orcish followers as you can stomach.
Once you've finished, meet me in front of the temple.