From the Start, I Shrink Down and Turn a Toilet Cistern into a Fortress

[Apocalypse + Survival + Total Solar Eclipse + Shrinking + Shelter + Superpowers + No Female Lead + Satisfying Power Fantasy] The apocalypse game descends, throwing the world's creatures into chaotic mutations as zombie fiends run rampant. I unexpectedly draw the Shrinking talent and get bound to a toilet-tank shelter, trapped in a dilapidated high-rise apartment! Corpse fiends and mutated monsters roam everywhere. While others are bound to shelters like caves, swamps, and skyscrapers, I can only hide in a cramped toilet tank and build my own fortress. I unexpectedly tame a mutated cockroach named Yuanbao as a mount, reinforce the tank, set up electric fences, stockpile miniature supplies, and upgrade my shelter step by step. I build a team and fight alongside an alliance. While fighting off zombie hordes and bizarre creatures, I explore the high-rises of the wasteland and grow stronger by killing monsters. No female lead, equal parts horror and comedy, with satisfying stockpiling, base-building, and survival.