Deathstalkers in Shadowfang
Find the missing Deathstalkers Adamant and Vincent inside the keep.
Find the missing Deathstalkers Adamant and Vincent inside the keep.

You hand it in inside the dungeon, so the reward comes during the run.
Horde: High Executor Hadrec in Silverpine Forest (43.4, 40.9).
Horde: Deathstalker Vincent in Shadowfang Keep.
Ghostly Mantle, Tanned Shoulderpads, Bronzed Shoulderguards, 5,350 XP.
Deathstalkers in Shadowfang is a level 25 quest; you can pick it up from level 18. It takes you into Shadowfang Keep.
All Shadowfang Keep quests on one map ·Shadowfang Keep dungeon guide
Sources: Quest data from ForeverDB.net · ForeverDB: Shadowfang Keep · ForeverDB: Every dungeon quest for the level 20 to 30 dungeons · ForeverDB: Deathstalkers in Shadowfang · ForeverDB: The Orb of Soran'ruk · ForeverDB: The Book of Ur · ForeverDB: Arugal Must Die · ForeverDB: The Test of Righteousness