In a world where games and reality intertwine, ferocious beasts invade, and humanity awakens various classes. Having crossed into this world, the protagonist, Lu Yuan, is determined to change his fate through class advancement. During the awakening ceremony, although Lu Yuan triggers extraordinary phenomena in heaven and earth, his summoned creatures—a hammer and skeleton soldiers—lead everyone to mock his hidden class, the seemingly worthless "Steel Summoner," as nothing more than a blacksmith's profession. The principal is disappointed, his classmates ridicule him, and his childhood sweetheart betrays him. However, Lu Yuan unexpectedly activates the SSS-rank hidden trait "Eternal Hammer, Immortal," allowing him to summon a devastating torrent of steel—from robot warriors, machine guns, and RPGs to tanks, aircraft, and even nuclear weapons. As he undertakes subsequent missions, the truth gradually begins to unfold.