I went and got this tonight for the heck of it. Mob spawned on the 2nd clearing. He wasnt in the room though, he was on the first landing, going down the stairs and to the left. Dropped shell first kill. This does work from inventory, you dont have to equip it. Its a neat toy but doesnt seem to do a whole lot of extra damage reverse charm kiting but its cool to have.
Like the post below said, the most western room on the map. Once you enter, clear it and clear the landings going down the stairs.
Edited, Aug 5th 2011 11:40pm by juston3