After Chengying as a traveler appeared in this tribe in the cave. The people of this tribe learned how to smelt metal. Under the water environment of this world, metal smelting has become a very easy task.

The temperature of water in this world can reach thousands of degrees. Enough to melt steel. At this high temperature, melting metals to create various metal utensils is as simple as kneading plasticine.

Because water will not harm the human body, it can be

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