Intermediate Apocalypse Fortress

The protagonist, Lin Yuan, is reborn one month before the apocalypse and awakens the only Divine-Grade Infrastructure System.

By consuming specific materials such as steel rebar, cement, and energy cores, he can upgrade any building from Level 0 without limit, granting it military-fortress-grade defenses, a self-sufficient ecological cycle, automated weapon turrets, and more.

He can unlock and install add-ons such as a water purification module, a soilless cultivation module, an energy core, a medical pod, and a manufacturing workshop, turning the fortress into a multifunctional super-base.

The System interface displays every detail of the fortress in real time, including its durability, energy reserves, supplies, and spatial layout, down to the number of bullets produced, perfectly fitting the story’s micro-level perspective.

As long as he has the materials, a single click upgrades the fortress, with immediate results. It becomes indestructible.