In 2075, a meteorite carrying a mysterious virus crashed into the eternal tundra in the far north (a fictional place name). The virus spreads rapidly through the air and water. After infecting humans, it will carbonize the cells and eventually transform into irrational and extremely aggressive "ember corpses". 80% Of the world's population has been infected, cities have been reduced to charred ruins, vegetation has been carbonized and withered in large areas, the air is filled with the smell of sulfur, and water sources are polluted by metal ions and turn dark red. Ember corpses retain part of their pre-life movement abilities, and mutate according to the environment into subspecies such as the high-temperature-resistant "Fire Ember Corpse" and the "Frost Ember Corpse" that can adapt to low temperatures. About 0.3% Of uninfected people awaken special abilities, such as controlling airflow and accelerating wound healing.
