This quest is given by Brutus. He has sent a patrol of men to the High Hall area to deal with a Troll problem there and he wants you to check on their progress.
Go to High Hill on foot (you cannot fly there).
Once you have sorted out the problem, report back to Brutus for your reward. ( 3500 XP and 500 gold )
P.S. : You get a better reward if during " The Runes of Wrath " one of the champions is killed (despite of what Quintus says) .
But if i were you i wouldn`t try to have them killed because you can get more xp by just killing the trolls yourself . It`s up to you ( .4500 XP and 800 gold )