Cosmic radiation descended, mutating 90% of humanity into bloodthirsty mutants, and shattering civilization. While survivors struggled to survive amidst the ruins, Lu Ming, newly transmigrated and becoming the warden of "Black Prison Island," found himself possessing an impregnable offshore prison—and three thousand of the world's most elite criminals! Ruthless bandits, elite soldiers, financial tycoons, genius scientists… these former enemies of society became Lu Ming's only cards to play. In this critical moment, the "Prison Empire System" activated! [Taming the A-level criminal 'Butcher' unlocks the building: Advanced Slaughterhouse!] [Criminals with 100% loyalty can be transformed into a special unit: 'Iron-Blooded Warlord'!] While other bases were still fighting the mutants with wooden sticks, Lu Ming's criminal army was already equipped with mass-produced power armor. While various warlords were still fighting over small territories, Lu Ming's "Black Prison Island" had been upgraded into an indestructible mobile war fortress, beginning its global patrols and judgment of all!