'Now that you are familiar with the track of the patrols of the Angmarim in Imlad Balchorth, I have another task for you...one considerably more dangerous, but at the same time could cause greater harm to the Angmarim.
'The papers you found bear the mark of a lord of Angmar. This lord, who calls himself the Keeper of Books, seems to be responsible for managing all the trade and supplies that move to and from Angmar to the Orc-armies in the North Downs. If he were to be defeated, we may be able to acquire the translation key to these troop orders.
'To that end, I would ask you to gather allies and raid the camp of the Angmarim that lies some distance west of the large lake, a place of high hills and winding paths. The Keeper of Books must be defeated and the orders deciphered.'
Birgir was pleased with the disruption you caused among the ranks of the Angmarim already, but he feels it was not quite enough.
Discover the library of Mul Kholum
Múl Kholuim has his camp inside a ruin in some high hills south of the large lake in Imlad Balchorth, west from Myrkworth. Birgir has asked you to find the camp of the Angmarim keeper of books.
Defeat Mul Kholum
You've found Múl Kholuim's camp inside a ruin in the high hills south of the large lake in Imlad Balchorth.
Birgir has asked you to defeat Múl Kholuim. He also warned you to gather allies.
Return to Birgir
Birgir is at Myrkworth, northeast from Múl Kholuim's camp.
Having defeated Múl Kholuim, you should return to Birgir.