Global Flood: I built a Doomsday Ark with a 10,000x Multiplier

Leo Hart was kind, trusting, and rich, and that got him killed. When the Great Deluge drowned the world, his fiancée Sienna and best friend Trent stole his supplies and left him on a raft to be eaten alive by mutated crabs. Then he wakes up 45 days before the flood, with the system he needed all along: an Infinite Stasis Space where time stands still, and a Multiplier that can turn any stack of items into 10,000 times as many, once a day.

This time, Leo is cold, calculating, and utterly selfish. He leverages every loan he can get and multiplies water, food, steel, ammunition, and fuel into a hoard that could keep a hundred thousand people alive. He buys an ugly amphibious RV he calls the Nomad. While Sienna and Trent drain his accounts for a luxury vacation, he quietly documents their embezzlement. Then the flood hits, the world drowns, and Leo watches from his RV with a hot steak while they are trapped in a sinking hotel.

In the new world, clean water and hot meals are worth more than gold. Leo trades for Evolution Cores and watches Sienna's looks turn worthless as she starves. He upgrades the Nomad into an armored hover-yacht and recruits Kira, a lethal sniper who is no damsel and wants his resources, not his protection. Together they kill a giant mutant crocodile, annihilate the Iron Jaw pirate fleet, and starve out Trent's corrupt flotilla until he surrenders and scrubs Leo's bilge tanks. A dive into the Mariana Trench brings a nuclear submersible, then a final epic battle with the Abyssal Leviathan, where Kira lands the killing shot.

Leo absorbs the Leviathan's core and upgrades his ship into a floating fortress. He becomes the undisputed god-king of the ocean, with every faction bowing to his Sovereign Fleet. He started as the world's easiest mark and ends as the man who won the apocalypse.