Stone, Sword, Gun, Plutonium

Gu Yan Mu Chan, a weapon enthusiast, accidentally travels back to a primitive society while polishing his collection. He possesses a "Stone, Sword, Gun, Plutonium" cycle system that can unlock weapon knowledge beyond his era at the current civilization level and provide percentage-based damage amplification. However, he soon discovers that he is not the only one who has arrived with a system. Someone has unlocked bronze smelting and is forming a primitive legion like an iron tide; another has mastered early gunpowder formulas and attempts to conquer the wilderness with thunderous roars; and others... have ambitions beyond this. From tribal conflicts in the Stone Age, to the rise and fall of cold-weapon dynasties, to the colonial waves of gunpowder, multiple transmigrators with their own "system cheats" compete on this land. Some pursue speedrun conquest, some are obsessed with technological crushing, but Gu Yan Mu Chan chooses a slower path—farming, nurturing people, and building civilization. Because deep within the system, there is a line of small text: When civilization reaches the "Plutonium" stage, it is both a shield that protects civilization and a sword that destroys it. The children's rhyme says "rock-paper-scissors," but civilization says "stone, sword, gun, cannon, plutonium"—this is a cycle, and the one who holds the nuclear key will decide whether this cycle leads to eternity or to an end. — Description from novelcodex.org