Reborn with an Apocalypse System

Frozen to death in the apocalypse, Sylvester Sutton is reborn in 1971, 45 days before the Ice Age. Bound to the [Omni-Upgrade System], he strengthens equipment, fortifies his house, repels his bully cousin and bandits, hoards supplies, and tames a Snow Mastiff. He builds an Underground Fortress, eliminates bandit gangs, and overcomes behemoths and beast tides. He defeats northern shelters' forces, establishes an underground utopia, becoming the sole eternal king of the apocalypse.