Dealings with Goblins
The following story can be experienced in Thorin's Hall within Ered Luin by starting the quest “Prologue: At the Behest of Unnarr”
Two years had passed since the events in Skorgrim’s Tomb. The dwarven miner, now a daring adventurer, returned to Thorin’s Hall where he would uncover a sinister plot to pit dwarf and elf against each other once more...
Upon his arrival, the adventurer was informed of Guard-Captain Unnarr's desire to speak to him. Unnarr had learned that one the old armories had been left unguarded. Vitharr, a dependable guard, had apparently abandoned his post.
Further Reading: To Avert A War