In their lightless sanctuary, an army of snake men gathers to bring the world to its knees. The skull of the dead god Ydersius has fallen into the hands of his worshippers once again, and the fanged fanatics now begin the rites to resurrect their dead god. Only the heroes stand between the snake men and their mad conspiracy to unleash one of the world's most terrible tyrants once more. Can the PCs gather the weapons and allies they need to counterattack the snakes and kill their decapitated god once and for all, or will their failure mark the beginning of the Age of Serpents? Decide the fate of an entire world here, at the climax of the adventure path Skull & Shackles!