World War 3 has turned most of the world into a barren wasteland. Sanctuaries have popped up around the world. Few, and far between, these sanctuaries house the crowded and frightened masses that are now the remains of the human race.
Kindred society has persevered as well. Clinging to the security of the high walls, city Princes regulate the population with an iron fist. Those lucky enough to be selected to enter one of these safe havens strive to rebuild and return to some sense of normalcy.
Solaris is one of those Sanctuary Cities.