C1645 Whirlwind Hammer

In order to forge a piece of raw iron into steel, all the impurities contained within the raw iron must be removed evenly. Even if there was only a tiny bit of impurity within, it would cause a flaw to exist just now.

Perhaps this didn't sound difficult, but to complete it in the time it takes for an incense stick to burn wasn't simple.

Qii Zilei, who was standing at the side