This quest is not available in game.
Slay Agmond's killer, Murdaloc.
Slay 12 Stonevault Bonesnappers.
Report to Prospector Ironband in Loch Modan.
Agmond's tracks lead from the west. It is easy to tell from the bloody smears across rock and sand that the dwarf crawled some distance.
And here he died.
Upon close inspection, the word "Murdaloc" is roughly scrawled in a patch of Badlands sandstone.
Scrawled next to Agmond's dead hand.