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I have succeeded! I have finally succeeded! Cold forging, a thousand hammer blows, so this is it... Outside th…

I have succeeded! I have finally succeeded! Cold forging, a thousand hammer blows, so this is it... Outside the mountains, how many people laughed at me, saying that cold-hammering iron would surely break it, how could it withstand a thousand hammer blows? So it turns out, it was the difference in the iron! Fortunately, the iron balls remove impurities, and infusion steel gains toughness. Thus, it can withstand a thousand hammer blows, becoming thin, tough, and sturdy.