Tower Lord: My Towers Can Merge and Mutate

Overnight, the whole world sinks into an endless night. Each person gets a city, and each night brings a beast tide. A lord cannot die inside the city, but cannot take a single step beyond its gates either. The only thing they can rely on is their towers. When Shen Yan wakes, he finds a new item in his hand: a "Tower Synthesis Blueprint." Fuse two towers into one, and it can mutate or evolve beyond its rank. While everyone else builds towers to defend their cities, he tears his down and rearranges them. But the crack at the heart of the city tells him this place has already lost once, and the long night is far from over.