"Sammath Gul are the chambers once occupied by the Dark Lord Sauron in the guise of the Necromancer of Mirkwood. Stained by his presence, few now dare enter here..."
In Sammath Gul, the chambers of the Necromancer, the most evil of spirits were summoned and sent forth to do Sauron's bidding. One such spirit still remains, locked behind the doors of Sammath Gul.
This quest will be cancelled if you leave Sammath Gul before completing it.
You should defeat Gorothul and attempt to unlock the doors behind which the spirit Demafaer resides.