Baron Sablemane wants you to steal Grulloc's Sack, and then return it to him at the Circle of Blood in the Blade's Edge Mountains.
I've outdone myself again. I've fashioned a sleeping powder for you to use on Grulloc, the gronn I spoke of who is guarding what I want.
Grulloc keeps himself at the Cursed Hollow, an area at the eastern edge of Dragons' End on the other side of the Circle of Blood.
If I were you, I wouldn't tarry long once you have his sack. The effects of the dust won't last long.