The Sky Pharaoh Hakotep I has risen and launched an attack against the cityof Wati with his infamous flying pyramid. The heroes return to Wati to defendthe city against this menace, only to discover that the attack is just thepreface to a larger invasion of Osirion, controlled from Hakotep's ownflying tomb. Will the heroes call down the flying pyramid of the Sky Pharaohfrom the sky, or will their bones join the thousands of skeletons that liewithin the slave trenches of Hakotep? A 13th-level Pathfinder adventure, The Slave Trenches ofHakotep continues the Mummy's Mask Adventure Path.