When the end of the world comes, the giant mobile fortress becomes the last refuge of mankind, and the low-level refugees can only become the food for the giant zombie tide. The ace veteran of the old era who had been frozen for hundreds of years woke up and was treated as cannon fodder by the tower nobles at the beginning and thrown into the slaughterhouse of the Fusion Corpse King. With no ammunition and food, and broken equipment, the moment the claws penetrated his heart, he returned to three seconds ago!