Weathering the storm: Humanity constructs and migrates to Shelter Cities, some far more prepared than others. Isolated populations and extremely harsh conditions have varying degrees of impact on human evolution. After the Thaw: each Shelter City is an oasis and a Nation in its own right. Trade routes and commerce re-establish, and once travel between them commences, nature adapts. Artificial and natural cultivation methods give rise to beautiful and lethal swings in bio-diversity. Abandoned, derelict, and blighted infrastructure gives rise to peculiar and horrific mutations. A new age of beasts and mythology. The conflicts that plague man-kind through time and memoriam are cast aside as nature takes the apex and humans become prey.