Running the Gauntlet in the Underworld at the End of the World, With an Evolving Safe from the Start

[Eerie invasion] + [Loot, fight, extract, and knife runs] + [Ruthless and decisive] + [Invincible, thrilling power fantasy] Yang Qi, known as the godfather of rags-to-riches stories, unexpectedly transmigrates to another world. Ten years ago, countless eerie beings and bizarre, evil creatures invaded, causing massive casualties! Modern human weapons were almost powerless against these entities, bringing human civilization to the brink of extinction. Only scattered remnants survived! But amid the despair, this world suddenly merged with the rules of a game, granting all humans the ability to explore other worlds! These included places like the Underworld from Xia Kingdom legends, as well as Hell, the Netherworld, and other realms from Western mythologies! Using weapons, armor, and all kinds of tools recovered from the Underworld, humanity finally gained the ability to fight the eerie beings and began reclaiming the regions they had overrun! Yang Qi joins the GTI organization and awakens a red-tier growth-type secure container from the start! He charges into the Hall of Judgment at the start, loots the Underworld's top-tier red item, the Book of Life and Death, and extracts with a fortune worth tens of millions! Even more powerful instances soon emerge, including the Journey to the West, the Celestial Court, and the Great Thunderclap Temple... From then on, Yang Qi slays the eerie beings and sweeps away demons, rekindling the light of hope for humanity in the apocalypse! And the source and truth behind this eerie apocalypse gradually come to light!