In a world that faced extensive war and early nuclear development and destruction, the human survivors live in a cold hell produced by an atmospheric overcast and formation of an ice sheet. Meanwhile, very few other species survive, with most animals and plants living near the humans. Oceans and other large bodies of water are rare, although they are present under most of the ice. Now, take control of a small nation-state living around the equators and try to be the last man standing. The year? 567, exactly 450 years after the apocalypse in OTL's 1453.