The Dead Can (and do) Speak!
Instructions: Order & Destruction
No access to the Tomb of the Vulture Lord for now
Kill the 3 Tomb Scorpions bosses at sixth boss of the Tomb of the Vulture Lord Dungeon, in Land of the Dead (entrance at 3.6k 26.6k). They should drop 'High Priest's Head'; click on it for the unlock.