Satisfied with his efforts against the Jangovar in the Ironfold, Durin is now ready to return to the Lonely Mountain with you, but first you need to find Authi Gem-cutter and make sure he is ready to go home.
'I am ready to return to the Lonely Mountain with you, ${PLAYER}. I understand there is to be another dwarf travelling with us? Yes, Authi Gem-cutter. Where is he to be found?
'The Quenching Trough? You are welcome to go there and retrieve him, friend. I have spent more than enough time within those walls, and do not desire to spend any more. Now my thirst can only be quenched by battle and glory, and that lies beyond Járnfast!
'I will meet up with you after you have found Authi.'
Khîl is in the Quenching Trough, quite distraught.