A grim ritual, already in progress, will use the power of theSerpent's Skull to restore the serpentfolk of Golarion to their true,terrible potential, instantly creating a new menace below all the nations of theworld. A lost Pathfinder holds the key to disrupting the ritual, but before hisplan can be executed he must first be rescued from his underground prison. A Pathfinder Roleplaying Game adventure for 13th-level characters,this volume continues the highly anticipated Serpent's Skull AdventurePath, in which the heroes fight their way through a treacherous jungle todiscover and plunder an ancient lost city. This volume contains a wide-ranginggazetteer of the serpentfolk city of Ilmurea, with tips for expanding thelocation to enrich the campaign. An overview of Nethys, god of magic, by Sean KReynolds, provides new insight on one of Golarion's most importantdeities. Plus five new monsters in the Pathfinder Bestiary, new fictionin the Pathfinder Journal, and much more!