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A magical jade gave Lin Yi the ability to evolve mechas by relying on killing, but it also made it impossible for him to live in peace. In the endless killing of evil spirits, dark beasts, aliens, and humans, he suddenly realized that when he first set foot on this path, what he was pursuing was actually protection. Protect his family, protect his friends, protect his territory... And everything else he wants to protect! After awakening, Lin Yi transformed into a guardian and used the method of killing to protect everything he cherished!