*bump*
Looking for it aswell, only cause killing him gives nothing as far as I know ;s cleared nearby cave Hob's fall (I think) - no treasure there, only a bunch of necros ;s
I'm still checking the area.
EDIT: Found that damn stash, not so close to the marker. You have to go NE behind the great landmass with that statue thingy (the one u see on the right from the point he marked when you look at the sea). There is a small island there with a statue, there is a Talos shrine there. Treasure is on one side of it.