Bring Durar's Power Cell and Kathorn's Power Cell to Raegar Breakbrow at Prospector's Point.
We're almost there, but the war golem won't run without power cells. From the information I was able to collect in Dun Argol before we were discovered, both Rune-Smith Durar and Rune-Smith Kathorn each create one power cell.
We'll need one power cell from each of the rune-smiths before our golem will work.
You should be able to find each rune-smith in his workshop on the central level of Dun Argol.