Sins of a Solar Empire: Rebellion - Forbidden Worlds DLC [Online Game Code] Four new planet types to colonize and exploit (Barren, Ferrus, Greenhouse, Oceanic), each created with beautiful high-res textures. New Planet Specialization System: Dedicate your worlds to either social or industrial output. Devoting your planet to social improvements will increase its population and culture, at the cost of trade income and ship production. Choosing an industrial path will limit your growth and culture, but mak 15 new research subjects allow the races to conquer and expand onto the forbidden worlds. Discover 40 new planet bonuses during your exploration of the galaxy, unlocking the dark past of the Sins universe. Unlock five new Steam Achievements and display your mastery of forbidden space!