'The text you recovered told of an alliance between Angmar and the Trev Duvardain. I have done some research and learned that Domongart has snet an emissary to treat the Angmar.
'You should investigate the matter. There have been many reports of Hillmen of the Trev Duvardain near the tower of Minas Agar near Barad Gularan. We must stop this alliance from happening, no matter the cost.
'Defeat Karstiona, the emissary, then return to me. If you wish to enter Minas Agor, I suggest you take some trustworthy allies.'
The Trev Dunvardain have sent an emissary to Agar to treat with the minions of the Iron Crown.
You must travel to Barad Gularan and defeat Karstiona, the emissary of the Trev Dunvardain, inside Minas Agar.
Having defeated Karstiona, you should return to Bruinfair and tell him of your success.