The rustic folk of Blackbeach have kept their cursed heritage secret forthousands of years -- they are pureblooded scions of Lost Azlant, thesunken continent across the western sea, whose bloodline eventually causes themto transform into sea-folk and obey a strange underwater entity. A localsorcerer trying to cure his people has awakened a terrible evil, locked away ina nearby Azlanti ruin for thousands of years. Now the villagers are rapidlydevolving into fishlike monsters and hearing a telepathic call they cannotrefuse. Can the heroes save the villagers and stop the ancient abominationbefore it escapes to avenge itself? An aquatic dungeon adventure for 6th-level Pathfinder RoleplayingGame characters.