Explore a mysterious ruin of the prior worlds—or build ancient sites for your campaign! Mysterious, powerful, and usually dangerous, the vast ruins of the prior worlds are the defining feature of the Numenera setting. The secrets and wonders they contain are a siren call to characters from across the Ninth World—and to GMs and gamers drawn in by Numenera’s unique sense of mystery and spectacle. Jade Colossus: Ruins of the Prior Worlds explores in detail one such ruin, and provides in-depth content for creating endless weird and wonderful sites of your own invention. Run an entire campaign around the Jade Colossus, or integrate the site (and the fully realized nearby city of Ballarad) into your existing campaign as the location of one or more exciting adventures. Or (and this is the really cool part!) use new Numenera Ruin Mapping Engine to create an infinite array of prior world sites ripe for adventure—with all the mystery and weirdness of the Ninth World baked right in! Create dozens of other sites of your own design, large or small, building an amazing campaign filled with imagination and wonder unlike any other RPG. Jade Colossus is an incredible resource for Numenera GMs already running campaigns, and a great launching point for new campaigns as well.