Pathfinder Adventure Path #40: Vaults of Madness (Serpent's Skull 4 of 6) by Greg A. Vaughan
A strange swashbuckler rescued in the City of Seven Spears reveals the secret beneath Saventh-Yhi — a forgotten serpentfolk city called Ilmurea, inspiration for the superstitious native fears of a terrible evil lurking just underfoot. The heroes must accompany their new ally to rescue her captured companions in the city below, braving the trap-laden, monster-infested Vaults of Madness that stand between Saventh-Yhi and Ilmurea. But just as they venture forth, a new inhabitant takes up residence in the City of Seven Spears — the legendary Gorilla King himself!
A Pathfinder Roleplaying Game adventure for 10th-level characters, this volume continues the highly anticipated Serpent’s Skull Adventure Path, in which the heroes fight their way through a treacherous jungle to discover and plunder an ancient lost city. Additional articles present rules for handling complex, sadistic deathtraps worthy of the legacy of ancient sites like the Vaults of Madness and an ecological overview of the Charu-ka, the savage ape-men of the Mwangi Expanse who swear fealty to the Gorilla King. Plus five new monsters in the Pathfinder Bestiary, new fiction in the Pathfinder Journal, and more!