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.