On the fantasy and xuanhuan apocalyptic wasteland, corrupt Qi descends and exotic beasts run rampant, with humanity barely surviving under the fire seed. Li Mo is reborn back to the eve of his death, accidentally awakening the SSS-class city defense architect skill. While others risk their lives gathering beast crystals to survive, he wildly smashes beast crystals to upgrade city defenses, building all the way from a wooden cabin to a floating divine city, transforming primary arrow towers into divine tower defenses. He flattens enemy gangs, subdues the Nine-Tailed Beast King, fights his way out with ten thousand towers as soldiers, and builds humanity's eternal sanctuary.