You must get Onyxia to breathe fire on the Unfired Ancient Blade. Once this is done, pick up the now Heated Ancient Blade. Be warned, a Heated Ancient Blade will not remain heated forever - time is of the essence.$B$BThe last step before returning to me is to slay the beast and drive the Heated Ancient Blade into her corpse.$B$BDo this and Quel'Serrar will be yours.