Reborn in the Apocalypse: With Guns and Food, I Fear Nothing

Natural disasters + supernatural abilities + absolute rationality + mysteries of the apocalypse + reborn Ji Bai, reborn in the apocalypse, happens upon a tiny kitten and sets out to uncover the truth behind the end of the world. Are humans the original inhabitants or the invaders? What caused species to mutate? Have natural disasters become the rules? All of it must be explored. The protagonist, Ji Bai, sets out with his cat, only to discover that the cat has mutated too and can speak. He battles ninjas in a deadly forest and investigates the truth in Shennongjia. After encountering a deranged being that assimilates cancer cells, he gains immortality.