Grulloc Has Two Skulls

To the east, at the terminus of Dragons' End, is the Cursed Hollow. Therein, Grulloc, son of Gruul, plots his dimwitted schemes.$B$BI heard that one of his possessions was stolen from him through trickery. Was that you? Unfortunate that he was not slain in the process.$B$BIf we are to regain our freedom, I would have you take his most prized possession, a dragon skull from when he rejoiced in his father's slaying of the black dragonflight. The only way you'll get the skull is to vanquish him.