The Pact Worlds are the beating heart of the Starfinder campaign setting, a solar system full of citizens both familiar and bizarre. From the cosmopolitan corridors of Absalom Station to the carnivorous jungles of Castrovel or the floating cloud-cities of the gas giant Bretheda, this hardcover rulebook is your guide to Starfinder's core worlds and civilizations, and the perfect place to launch any adventure. The pocket edition presents the same contents in a smaller sized softcover for a lower price and better portability.