At the edge of the ancient mine, the men walk for a hundred miles, but they can't find anything. They want to find some rocks, but the wind is blowing so hard that they're all swept away by it. The sun is shining brightly, and the men are all cultivators of the wind. The wind is so strong that it's like a "black hurricane" . The men think that the furnace is the real thing, and that the people who were killed by it are the ones who were using the furnace. They wonder how an ordinary weapon could have such a powerful effect. They don't know if they've actually entered the mine. It looks like a valley, and according to the book of the heavenly sources, the valley is the legendary "fire dragon grave." The men decide to avoid coming in contact with the valley, since the energy is so thick that they won't be able to fight it.