After the Origin

(There is no heroine, the combat power is very controlled, there is no system, there is little excitement, the protagonist is not the male protagonist of the novel, don't misunderstand) Catastrophe, ice sheets swallowed up cities, and the old empire turned into scorched earth. My name is Lu Chen. I used to be a waste without nuclear weapons. I worked illegally in exchange for mines, just to support my sister who had rare nuclear weapons. But the disaster separated us. I should have died in the ruins, but I was picked up by Eclipse, but I unexpectedly awakened the source resonance. Later, the iron fist of the Federation abandoned its borders, the old aristocrats secretly pursued restoration, and the Eclipse Society became obsessed with "purification." In this world, only the walking dead who snatched resources and played tricks were left. I just wanted to find my sister, but I was involved in a dead end. (This is my first time writing, so I may not have a good grasp of it, so please give me your feedback)