Defeat Mogor, Hero of the Warmaul. Should you win, speak with Wodin the Troll-Servant to collect your reward.
<Gurgthock is counting his massive pile of gold.>
You've made me a lot of money, kid. If you can defeat Mogor, I promise to make it worth your while. All that pain you suffered in the Ring of Blood is gonna end up paying off.
Now get in there and show these ogres what you're made of!