The Mummy's Mask Adventure Path begins with "The Half-Dead City," an exciting new adventure in the pyramid-laden realm of Osirion, Land of Pharaohs! In the city of Wati, the church of Pharasma holds a lottery allowing explorers to delve the tombs of the city's vast necropolis in search of the nation's lost glories. In the course of investigating dusty tombs and fighting their ancient guardians and devious traps, the heroes encounter a group of rival adventurers intent on keeping one tomb's treasures for themselves. At the same time, the heroes learn that a dangerous artifact has been stolen from the tomb. Can the adventurers defeat their rivals, or will they fall to the undead defenders of the city's necropolis?
Following the opening of its necropolis, the city of Wati is overrun by hordes of the unquiet dead. The heroes must once more brave the abandoned streets and dusty tombs of Wati’s necropolis in search of the powerful artifact called the Mask of the Forgotten Pharaoh, as well as the necromancer who is using it to create the undead uprising. But mysterious masked cultists also seek the artifact so they can bring a pharaoh from the ancient past back to life. Can the heroes defeat the evil necromancer and return the deceased to their graves, or will Wati truly become a city of the dead?