This is a post apocalypse scenario where humanity is warring agaisnt a cosmic horror that has spread across the planet. Called the Brainrot by survivors this is a luminous and predatory infective fungus that forces it's way into a host body to infect the brain, reducing the victims to zealous and devout worshippers of the fungus itself. Having lost the willingness to use advanced technology as it goes against their gods will, constantly worshiping the Brianrot and it's constructs and determined to serve all of humanity up to it on a silver platter.