This quest is not available in game.
Journey to Orgrimmar and speak with Shenthul at the Cleft of Shadow.
You have served the Deathstalkers well, <name>, but perhaps it is time for you to venture outward. While you have shown aptitude in the ways of stealth and deception, you still require much training.
The Deathstalkers have allies within the Shattered Hand. Seek out those that would assist us - find Shenthul in Orgrimmar.