Deathstalker
From WoWWiki
The Deathstalkers are the assassins' guild of the Forsaken and the elite guard of the Dreadlord Varimathras, the majordomo of the Banshee Queen Sylvanas Windrunner. The Deathstalkers function as the Forsaken's equivalent of the Shattered Hand as a rogues' guild and spy network, reporting their information directly to their dread master.
History
In the year following the Third War, Sylvanas realized that she had gained independence from the Lich King, and began a war to claim Lordaeron - which, at the time, was held by the dreadlords Balnazzar, Detheroc and Varimathras. During the war she came upon an army of bandits led by the self-proclaimed Bandit King Blackthorn. Blackthorn was possessed by one of Sylvanas' banshees, and his army was added into Sylvanas' group of undead followers who were also free of the Lich King's grasp. After Sylvanas formally declared her faction as the Forsaken, the Deathstalkers were formed from the bandits who returned as the undead and retained sentience.
Deathstalkers are highly trained and extremely dangerous. They are rightfully feared as the best assassins in the world not only for their skills, but because they are undead. Deathstalkers have no need to eat, drink, sleep, rest or even breathe air. They never feel physically tired and possess tremendous willpower. Deathstalkers can remain submerged in water indefinitely without any need to rise, and can wait as long as it takes for their target to arrive. They can even pose as corpses, since by all means, that is exactly what they are.
