Gray Fog Century

The arrival of gray fog is the opening ceremony of a great era and the beginning of human extinction. The surge of gray mist has given rise to countless disasters on this continent. Natural disasters and catastrophes, the earth is barren, the sun is dim, miasma viruses, strange beasts appear, infections are everywhere, disasters spread, poisonous rivers are everywhere... Humanity was born in ancient times, prospered in civilization, and survived in the gray fog. Gray fog, natural disasters, strange beasts, infections, epidemics, wars, and the prosperous human society was almost destroyed in just a few decades. The only remaining humans were forced to the southernmost part of this continent, where the land is the most barren, the resources are scarce, and the environment is harsh. The survivors survived by building high-walled cities.