Rothgar is concerned about the ominous words you heard from the Dourhand burglar and feels Mathi Stouthand, Lord of Gondamon, should be told that trouble is brewing.
'That Dourhand burglar said that his folk paid the goblins well to steal a prince? I don't know what that means, but it can't be good!
'Mathi Stouthand became the chief of Gondamon, the great watch-post of the Low-lands, shortly after the Dourhands were driven from Thorin's Hall. If there is a war brewing, Mathi needs to be warned so he can begin the preparations.
'Follow the road east to Gondamon. There, I expect you'll find Mathi on the upper levels. Travel with great haste, ${PLAYER}! I would quicken your feet with a tale of great deeds, but I see that there is no time to spare!'
Mathi Stouthand can be found on the upper levels of Gondamon, along the road east of Noglond.
Rothgar has asked you to deliver word to Mathi Stouthand that the goblins and the Dourhands are planning some new treachery, while he delivers the stolen gold back to Dwalin.