Enter the megadungeon! When the mysterious Gauntlight, an eerie landlocked lighthouse, glows with baleful light, the people of Otari know something terrible is beginning. The towns newest heroes must venture into the ruins around the lighthouse-and delve the dungeon levels far beneath it-to discover the evil the Gauntlight heralds. Hideous monsters, deadly traps, and mysterious ghosts all await the heroes who dare to enter the sprawling megadungeon called the Abomination Vaults! "Ruins of Gauntlight" is a Pathfinder adventure for four 1st-level characters. This adventure begins the Abomination Vaults Adventure Path, a three-part, monthly campaign in which the heroes explore a sprawling megadungeon to stop an ancient evil from renewing her monstrous vengeance. This adventure also includes an extensive gazetteer of the town of Otari, the heroes home base, as well as new monsters, new rules, and new artifacts-including the dread Gauntlight itself!Each monthly full-color softcover Pathfinder Adventure Path volume contains an in-depth adventure scenario, stats for several new monsters, and support articles meant to give Game Masters additional material to expand their campaign. Pathfinder Adventure Path volumes use the Open Game License and work with both the Pathfinder RPG and the worlds oldest fantasy RPG.Sales Points- Kicks off the first-ever three-volume Pathfinder Adventure Path campaign, promising an easy on-ramp for new and experienced players as well as a satisfying conclusion that comes just in time!- Based in Otari, the "starting town" of Pathfinder Second Edition introduced in the Pathfinder Beginner Box! Otari is also not far from the city of Absalom, the focus of the recent City of Lost Omens hardcover sourcebook and the Agents of Edgewatch Adventure Path.- Contains dozens of hours of exciting Pathfinder play, either as a stand-alone adventure or as part of the epic Abomination Vaults campaign, Paizos first-ever "megadungeon" Adventure Path!- Adventure/sourcebook hybrid.- Extensive marketing support throughout 2021.