A demonic voice echoes through the abyss: "You must level down to the rock bottom of hell." Seth Johnson, sacrificed at sixteen by his parents' cult in a twisted cleansing ritual, awakens in a dying world teetering on the edge of apocalypse. In this realm, humanity exists in a strict hierarchy—magic power determines worth, and civilization floats across ascending sky-bound regions. Reborn as Isiah Duncan, brother to Lucas Duncan, the prodigy whose very existence triggered the world's collapse, Isiah faces an impossible reality: he possesses no power to survive. Powerless where others flourish, he discovers an unprecedented path forward. Instead of ascending through conventional magic, he descends into forbidden strength, wielding the diabolic core of magic rather than the divine. In a world where leveling up means survival, Isiah must level down to claim his destiny.