Deathstalker Zraedus is an undead quest-giver (lvl. 40) located at Beggar's Haunt in the human-aligned territory of Duskwood. His loyalty to the Horde seems questionable at best. He and Apothecary Faustin had been sent by Varimathras to survey the lower Eastern Kingdoms and probably help develop the New Plague.
They were spotted by an Infiltrator, but he was captured by the orcs before he could be killed. Deathstalker Zraedus and Apothecary Faustin wish to poison the infiltrator before he can be questioned by the orcs and reveal to them what their supposed allies are up to in Duskwood.