Though we're not quite sure if this is the Earth or not, Panzer Dragoon Saga unfolds across a human civilization which is competing for land and resources after a vague disaster has befallen civilization. The Ancients, the hyper-advanced race of beings, are revered and feared by those left behind by whatever cataclysm wiped them and the rest of the planet nearly off of the map. It's a fantastic Sega Saturn RPG that fans clamor for a port of, but missing source code has prevented this from happening.