Global Apocalypse: I Own a Sky City

[Sky City System, zombies, and disasters later on. Sky City won't be invincible from the start.] Lin Yang: “Heaven-Flipping Seal!” His enemy's vision went black as a “mountain range” weighing countless billions of tons came crashing down! A mysterious electromagnetic storm swept across the globe. Communications went dead, all machinery reliant on tightly integrated chips ground to a halt, countless massive fissures opened across the land, and air and land travel were cut off. In this apocalypse, where supernatural powers have emerged, Lin Yang unexpectedly obtained the Sky City System. While other survivors were fighting over scraps of food, he was busy upgrading Sky City itself, developing its defenses, and building guards... While other factions were still arguing over who would be civilization's last hope, his sights were already set on the stars and the sea. Sky City advancement path: floating landmass → mobile fortress → aerospace carrier → interstellar stronghold → ...