Alaric, an unemployed university student from Earth, reincarnates into a nameless slave's body in a dying world consumed by dungeons and chaos. Mana circulation disorder poisons his new life—a condition guaranteeing death before his thirtieth birthday. Summoned creatures are humanity's only defense in this brutal realm, yet the power to summon remains exclusive; nobles summon reliably while commoners almost never manifest the ability. When the gods offer Alaric a divine challenge, he seizes the opportunity. Victory grants him summoning power and a choice: Hellfire Demon or Wind Demon. But through accumulated Chaos Points, Alaric unlocks an impossible third evolution—the Supreme Sword Demon, an ancient enslaved demon feared throughout hell itself. This demon king possesses unparalleled swordsmanship. Each blade strike eradicates victims from reality, erasing their existence completely; no one remembers them after death. Yet summoning this god-killing power merely opens the path to greater horrors. Alaric's true nightmare begins when he discovers the impossible: multiple reincarnators exist in a world that should contain only one. Within this deadly Godslayer war, survival demands absolute ruthlessness—kill or face extinction. His rivals will show no mercy, and neither can he. *Author's Note: Alaric's slave status represents only vestigial identity from before his reincarnation; the moment his consciousness awakened in that body, the label became irrelevant. His initial power isn't a cheat ability—the real game-changing strength emerges post-Chapter 19.*