It's a Desperate Situation at the End of the World, but I Can Strengthen It Infinitely

Doomsday + infrastructure + farming + mutation A great change has occurred, and the human world has ushered in an eternal night of despair. Countless evil spirits and ghostly shadows breed, and endless horrors and weirdness are hidden. The unknown people are either waiting to die in the wilderness, or huddled in crowded, damp, dark fortifications, while those high-level elites and powerful warriors live in the City of Hope. The unstoppable darkness continues to fall, the defense lines continue to press, countless fortifications have been destroyed, and the longed-for city of hope has also been mysteriously swallowed up! You are so scared, so scared, lying on the piles of corpses, screaming helplessly: "I don't want to die!" —— Finally, the instinct to survive drives you to find a way out among the dead. You touched and touched and found a tetanus kitchen knife. You have a sense of security, but it's not enough. You think, it would be great if it could be strengthened into an alloy machete. After a moment, the tetanus chopper turned into an alloy machete. … You still felt insecure, so you took off a worn-out protective suit from the dead body and put it on, thinking that it would be great if it could be enhanced into a Nightcrawler suit. After a while, you put on the lightweight and wear-resistant Nightcrawler suit, which gave you preliminary protection capabilities. However, you still don't feel safe. You looked towards the defensive fortress in the distance...