After Signing in for Ten Years, My Base Has Become a City in the Sky

The bloody rain of doomsday has come, and the world has turned into purgatory! Zombie monsters are rampant, and mankind is facing a crisis of extinction! Just at the moment of despair, Lu Entropy was transported into an [Immortal Fortress] and awakened the god-level sign-in system! Sign in every day and get tens of billions of tons of survival supplies and top-level technological blueprints! The base automatically defends itself, instantly evaporating tens of thousands of corpses! Others are still surviving in the cellar, but I am already lying in the fortress eating Maotai instant noodles! Little did he know, this was just the starting point for his future [City in the Sky]! Ten years later, a cosmic disaster befell the earth! The starry sky fleet is crushing, and survivors around the world are desperate to die! They looked up and saw a [City in the Sky] that covered the sky and sun slowly rising into the sky! Lu Entropy walked out, and in a flash, the rune mecha army swept across the starry sky! Who would have thought that this terrifying war fortress was actually the result of Lu Entropy's "sign in"!