Long ago, the demons crafted a grand experiment. They seeded a distant world with magic, using humans—fragile yet adaptable creatures—as its fertile ground. The humans, reckless and curious, fumbled through this strange gift, accidentally setting themselves ablaze or conjuring small disasters until, at last, they learned to wield magic with a glimmer of competence. Only then did the demons’ true plan begin: the Mana Gathering Stage. Portals opened across the world, leading to vast dungeons—tantalizing labyrinths brimming with treasure, secrets, and power, a siren call to adventurers from every corner of the realm.

For demons, though, there was a catch. They had to be powerful enough to defend their dungeons against these magic-wielding heroes, or risk being conquered, their legacies snuffed out. One such demon, Sorvax the Terrible, had risen to legendary status. His dungeon, boasting over a hundred perilous floors, was renowned as a near-impossible conquest. Adventurers who dared enter spoke of its terrifying depth and cunning traps, returning with tales of horror—or not at all.

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But even the mighty grow weary. Sorvax, with ambitions far beyond his current role, saw the need to pass on his legacy. He required a successor, someone to carry on the complex art of dungeon mastery. When a young, eager volunteer presented himself—a demon of little renown but boundless enthusiasm—Sorvax took him in, hoping to mold a worthy apprentice.

He did not yet know how deeply he would come to regret that decision.