Elrond bade you return to Tármunn Súrsa and seek the hiding place of Amarthiel's ring, Narchuil.
'The name Barad Dúrgul is not unknown to me. It was one of the places my scouts first observed. At first, it seemed that it was guarded by great watching-stones, but it was not so, for the watching-stones lie silent, and they have no power over the minds of friend or foe.
'You should seek out news of these stones, for I believe that the Enemy may be trying to draw us into a trap, not unlike the Rammas Deluon. Doubtless, the Angmarim Gate-wards outside of Barad Dúrgul are waiting for our assault before snapping the door shut behind us.
'Learn what you may, then return here to me.'
Barad Dúrgul is west of Tármunn Súrsa.
Gwathryn has sent you to defeat the Gate-wards of the Angmarim and learn what you may about the silent watching-stones.
Gwathryn is at Tármunn Súrsa, east of Barad Dúrgul.
You should bring the watching-stone orders to Gwathryn.