Just an FYI, I just killed this guy and the only hits I took were "Shak Dratha got worse", "Gor Taku got better". So if you are trying to raise your "Whisperling" faction, he definately won't do the trick.
I found this guy in front of a cave entrance at -2156, 433. He is on Shak Dratha faction and he dropped 2 Shadeling Silks, 3 Condensed Shadows and 3 Shade Silks when I killed him.