Slay Vyral the Vile and obtain Vyral's Signet Ring.
We have discovered another base of operations for the Twilight's Hammer. It is called Twilight's Run; it is a cave tucked in the northeast corner of Silithus. The local leader of the cult, Vyral the Vile, haunts that cave - it is he who you must next defeat. When you have done this, bring me his signet ring.
Fortune to you, <name>. The horrors of Twilight's Run are formidable indeed.