'I consulted with the Elves while you were away and learned that Elrohir, one of the sons of Elrond, is exploring the Mirkstone Tunnels to the north-west of here.
'He intends to learn more about the Dourhand's plans, and I want you to be there when he does! The entrance to the Mirkstone Tunnels can be found at the top of the Axe-head Path, north-west of here.
'The Dourhands have much to answer for!'
The Elves told Dwalin that Elrohir, son of Elrond, entered the Mirkstone Tunnels near Thorin's Hall to discover more about the plans of the Dourhands.
Talk to Elrohir
Elrohir, son of Elrond, entered the Mirkstone Tunnels to search for answers to the mystery of why the Dourhands have allied themselves with goblins. Dwalin asked you to meet with Elrohir to see what he may have learned.
Elrohir may be found somewhere in the Mirkstone Tunnels. The entrance to the Tunnels lies at the top of the Axe-head Path, north-west of Frerin's Court. Once in the Tunnels, follow the path. At the fork, turn right. Elrohir will be at the end of the path.
Elrohir gave you a letter to take to Dwalin.
Dwalin can be found in Frerin's Court, south-east of the Mirkstone Tunnels.