The goblins of Sundergrót have set up a secret meeting within the old dwarf ruins.
'${PLAYER}, something bothers me about the goblins in Sundergrót. I know not what, but something is amiss! Agátur looks as if he has something to say. Spit it out, my friend!'
Sundergrót can be found in the Floodfells.
You should talk to Agátur outside of Sundergrót.
Rúzat, Agátur, and Náth can be found at Limlók.
You should talk to the three dwarves.