The End of the World: the Second Civilization

Secret artifacts from an extraterrestrial civilization fell into the solar system, and humans rashly explored them, triggering a global mutation and catastrophe with their own hands. Green gas swept the world, the continent fell, and modern civilization collapsed overnight. As the apocalypse approaches, Zhang Qian is accidentally bound to the fire of higher civilization. Since then, he has continued to lose the power of higher civilization and is in charge of legion building, ordnance mass production, and military recruitment! The old human civilization is coming to an end, and he will create the second human civilization in the wasteland!