Berlichingen is a backwater world that used to be covered in life before some cataclysm ripped away its air and water. It is lightly populated, mostly with mining communities and fossil hunters.
Topas is simply described as a single radioactive desert, where people shelter in the ruins of war torn subterranean cities. The atmosphere is too thin to breathe, and water is almost non-existent. The cities are ruled by a single huge bureaucracy that stifles free enterprise, and strictly controls the distribution of power, air, water and food.