Fang Zhuo habitually set up a shielding circle around the room, and then began to sit upright and cultivate.

The Shaking Clouds, the Great Wilderness Washing Jade Sutra, and the Great Five Elements Divine Essence and Spirit Devouring Technique, all of them did not need to be intensified in practice, so Fang Zhuo had to cherish every minute and every second now. But that doesn't mean he's putting the purpose of his trip aside.

Just as he entered the house, Yun Rong had already quietly dived underground, diving into the nearby mine.

Blessed with the mysterious earthy yellow fairy aura, and the fact that she could already walk through the underground, Yun Rong moved freely underground as if she were in the air.

The current Yun Rong, after this period of cultivation, has quickly reached the strength of the fourth layer of Qi training. Fang Zhuo was greatly surprised by her cultivation speed, and after analyzing it, Fang Zhuo suspected that the greatest possibility was that it should be the immortal qi that had been sucked into the Yunrong soul core.

Holding the strange dagger that could devour the vitality and soul, it had the strength of the fourth layer of qi cultivation and was able to walk through the ground at will, Yun Rong went down to explore the cave, whether it was safe or efficient, it was far higher than Fang Zhuo himself.

Therefore, Fang Zhuo would concentrate on cultivation, and it seemed as if he didn't care about his task.

This copper mine has been excavated by the Bitter Sword Sect for hundreds of years, so the underground mine is intricately intertwined, stretching extremely deep and wide. Not to mention that there are still some old mine caves interspersed in between, even this part of the Bitter Sword Sect's own excavation is enough for Fang Zhuo to have a headache.

Fortunately, Yunrong can walk through the soil layer at will, and when he encounters the rock layer, although the speed of the passage is much slower, he can still barely do it. In this way, Yunrong's search speed is much faster.

According to the distribution map of the underground mines given by the ancient city, it took Yun Rong nearly half an hour to find the location of the first discovery of the demon beast. Fang Zhuo had been separating a wisp of divine consciousness to connect with Yun Rong. According to Fang Zhuo's request, Yun Rong took a turn around this area, and soon found the entrance to an old mine not far away.

The darkness did not have the slightest obstacle for Yun Rong, and under Fang Zhuo's command, she carefully used the cover of the rock to slowly walk towards the depths of the old mine.

Collapse and blockage can be seen everywhere in the old mine, and if this is really searched by manpower, it will be ironclad and laborious, and I am afraid that it will not be effective. Demon beasts like rats, which have an extremely keen sense of hearing and smell, are timid by nature, and once there is movement, they are long gone.

Yun Rong had been walking underground for a long time, and the huge and complex old mine cave made both her and Fang Zhuo a little dizzy. It seems that before the Bitter Sword Sect excavated this mineral deposit, the Golden Rune Gate had been excavated for a longer time.

Participating in Yun Rong's exploration with his divine sense for a long time made Fang Zhuo feel a little struggling. He simply withdrew his divine sense and let Yun Rong slowly look for clues by himself.

Although he had withdrawn this part of his divine sense, Fang Zhuo still hadn't devoted himself to cultivation. He slowly spread out the wisp of consciousness and slowly swept around.

It was a settlement for miners, with several rows of houses built. There is no shortage of trees and stones in the mountains, so these houses are crudely built, but they are very strong.

Gu Chengshan and the others lived in a few houses alone, and there was a warehouse in front of them that was specially used to store the refined copper.

Not far away, a row of houses made entirely of boulders sounded the sound of clanging hammers.

Fang Zhuo's divine sense probed in, and he couldn't help but be stunned for a moment. It's actually a smelting and forging workshop.

Dozens of workers work here. They smelt the excavated ore, then purify it, and separate the different copper materials from it. Six striking cases are arranged at the back of the blackest, and they hammer and purify the copper repeatedly, and finally form pieces of finished copper.

Forging and smelting were the most basic and important refining foundations that Fang Zhuo obtained from the artifact chapter. However, Fang Zhuo never had the opportunity to try the practice himself. Now that I see someone operating, I naturally have to take a good look. Although there is no refining utensils involved here, half of the process is already there.

While he was cultivating, he was learning other people's forging skills, and before he knew it, it was midnight. At this time, there was a fluctuation in the divine consciousness, and the information from Yun Rong.

There is a discovery!

Fang Zhuo looked with the help of Yun Rong's vision, and saw that there was a hole on the wall of a cave in the old mine.

The entrance to the cave was so large that it was almost the size of a man-dug mine. However, there were two points that caught Fang Zhuo's attention, the first was that this hole was very round. Its height is lower than that of artificially excavated mines, but its width is not narrow, almost a round hole. Secondly, the walls of this cave are very smooth, and it seems that something is often used in and out.

"Go in and take a look, be careful. Fang Zhuo looked at this cave entrance, and he had a feeling of uneasiness in his heart. Such a big hole, if it is really a rat hole, then how big will the demon rat be inside?

Yun Rong dived his body into the stone layer and slowly dived deep into the cave.

Fang Zhuo put away the exercises and increased the output of his divine consciousness to Yun Rong's side. With the help of Yun Rong's existence, he slowly spread his divine consciousness around Yun Rong. Soon, Fang Zhuo made a discovery.

Just a dozen zhang in front of Yun Rong, branches began to appear at the entrance of this cave. And in one of the branches, two huge demon rats were running through at a fast pace.

Due to the fact that it was underground, the extension of the divine consciousness was greatly hindered, and Fang Zhuo's divine consciousness could only probe a distance of twenty or thirty zhang, coupled with the divine consciousness issued by Fang Zhuo with the help of Yun Rong's soul body, it was even more limited, and he could only detect the situation more than ten zhang away. Therefore, in the end, the situation here still needs to be explored by Yun Rong little by little.

Yun Rong has to hide his tracks, so it is impossible to travel quickly. She slowly discerned the direction of the branches, making her way deeper into the caverns.

These rat tunnels extend in all directions underground, and their scale is far above the artificially excavated mines. Fang Zhuo found that the places where these rat paths passed were actually the places where the ore veins extended, and all kinds of copper ore could be seen everywhere on the walls of the rat paths. Fang Zhuo wondered if these demon beasts also liked to devour certain copper ores.

If that's the case, I'm afraid it's even more tricky. No matter what kind of monster beast, as long as it has the ability to devour metal, it is usually not easy to deal with.

Moving on, there were more and more demon rats walking through the rat path. Fang Zhuo repeatedly told Yun Rong to be careful not to be discovered by them.

Fang Zhuo's divine sense had never stopped perceiving his surroundings, so that once there was an abnormality, he would be the first to detect it and inform Yun Rong to flee. At this time, in his perception, two huge demon rats suddenly stopped not far in front of Yun Rong.

"Don't move. Fang Zhuo immediately asked Yun Rong to stop.

The two demon rats chattered to each other, not knowing what Lu Dao was talking about. Fang Zhuo quietly observed their posture and size, judging their combat effectiveness. In some of the records that Fang Zhuo had read, it was not small that the rat demon could be three feet long. But the body length of the two demon rats in front of him, not counting the tails, had already reached a zhang! Fang Zhuo was taken aback, at this time, the two giant rats suddenly screamed and suddenly rushed towards the cave wall on one side!