The heroes track down the cult of the Forgotten Pharaoh to its secret headquarters inside a giant sphinx statue in the Osirian desert, facing scorpion-men mercenaries and Areshkagal-worshiping maftets before a final confrontation with masked cultists and their leader, the Forgotten Pharaoh, who has been possessed by a fragment of Hakotep Is soul! Continuing the Mummy`s Mask Adventure Path, Secrets of the Sphinx is a Pathfinder Roleplaying Game adventure for 10th-level characters.