Information received from the letters you recovered in Black Speech led Glóin to offer rewards for the defeat of the Uruk-emissary from Angmar.
'You have done a great service for us all, ${PLAYER}. Glóin is right...you should be rewarded for your efforts now and in the future.
'If you find the emissary, Bhoghad, within the Great Goblin's throne room, defeat him and return to me with the news, and I will be certain to reward you.
'The throne room, from tales I have heard from Glóin himself, can be found at the end of a long tunnel. Of course, I have heard that the walls within Goblin-town cannot be trusted to remain closed or open.'
Bhoghad is in the Great Goblin's throne room in Goblin-town. Goblin-town lies to the north-east of Glóin's camp.
Tralli seemed pleased with all you have done for Glóin in the past and offered you a reward for hunting down and defeating the Uruk-emissary Bhoghad in Goblin-town.
Tralli Gemfinder is at Glóin's camp in the Misty Mountains, to the south-west of the entrance to Goblin-town.
You entered the Great Goblin's throne room and found Bhoghad entreating with the goblins there. You defeated the Uruk and should now return with the news to Tralli Gemfinder.