Time passed little by little, and it took a lot of effort for Hongtu to finally reopen this mine by Hongtu. Although Hong Tu's side is still dark, Hong Tu can already hear the sound of the shovel digging ore next to him, which proves that not far from where Hong Tu is, there are other demons collecting obsidian.

There are many caves in the Whirlwind Mountain, and the mines extend in all directions, with many connected mine branches. It's been hundreds of years, and half of the obsidian veins on Whirlwind Mountain have not yet been excavated. This obsidian vein was also one of the main sources of income for the lord of Babata. Hong Tu used his divine sense to look around him, and found that there were still a lot of obsidian ores in the rock layer next to him, but most of these obsidian were obsidian of inferior grade, so these obsidian were not collected by the demons sent here by Babata.

These obsidian are rare refining materials for demons, and in the demon world, one obsidian can be exchanged for a lot of magic stones, and magic stones are the resources needed for demon cultivation, and they are also the official currency traded in the demon world. Hong Tu killed Fili and the demons under him, and the magic stones obtained were also thousands, but Hong Tu knew that these thousands of magic stones did not have a lot of purchasing power in the demon world, which means that Hong Tu did not have much currency in the demon world in his hands.

And this obsidian vein in front of him is a huge wealth in the eyes of ordinary demons, and Hong Tu will be indispensable to walk in the demon world in the future, so Hong Tu is ready to dig up some of the ore in this obsidian vein and take it away. When Hong Tu leaves Whirlwind Mountain and enters the city, Hong Tu can exchange obsidian for enough magic stones. With the magic stone Hongtu, you can buy many rare materials in the demon world, and you can also buy many materials that Hongtu needs.

In the cave, Hong Tu immediately unfolded his divine consciousness, sweeping through the layers of rocks, Hong Tu found that his divine consciousness swept through this layer of rocks and encountered a lot of resistance, Hong Tu's divine consciousness fully expanded and could only penetrate the range of thousands of meters inside the rock layer, probably because the obsidian associated rocks can greatly block the divine consciousness of the immortal cultivators, so Hong Tu's divine consciousness can only explore a few kilometers in this piece of rock.

However, Hongtu's divine sense was able to detect thousands of meters deep in the rock layer, which was enough for Hongtu to find a large amount of obsidian, and in a mine not far to Hongtu's right, it found a high-quality obsidian. But when Hong Tu's divine sense swept over that piece of obsidian, he found that there were already dozens of demons digging in which cave, after all, not only Hong Tu, an immortal cultivator, could use his divine sense to investigate the situation inside the rock layer, but the demons here obviously also had their own means to find out which rock layer had a large number of high-quality obsidian.

The obsidian veins hundreds of meters away, since there are already other demons digging, Hong Tu plans to avoid these demons who dig ores, after all, Hong Tu has just entered the demon world from the earth, and in the eyes of this obsidian digging demon, Hong Tu is obviously a fresh face. Although Hong Tu's fresh face will not attract the attention of other demons, Hong Tu, who is in the demon world, should keep a low profile.

Hong Tu, who had transformed into a demon, used his divine sense to carefully investigate the spot again, and there were no high-quality obsidian veins within a radius of a kilometer. Hong Tu's figure flashed, appearing on the other side of the mine, according to the memory of the demon captain Fili, this whirlwind mountain is very large, covering a radius of hundreds of thousands of miles, and the mine cave on the whirlwind mountain has a range of tens of thousands of miles, so it takes a lot of time for Hong Tu to use his divine sense to explore the entire ore vein on the whirlwind mountain, but if Hong Tu wants to find a high-quality obsidian vein on the whirlwind mountain, it should not take much time, after all, the obsidian veins on the whirlwind mountain have only been mined for a few hundred years, and there are still many high-quality obsidian on the whirlwind mountain that have not been mined。

Hong Tu in this mine, his figure flickered and flickered, walking in the mine at a very fast speed, and when he encountered the demons mining in the mine, Hong Tu would not stop to greet them. There are thousands of demons mining in this mine, so these demons will not feel strange when they encounter demons who they don't know, Hongtu just kept looking for unmined high-grade obsidian veins, and finally after ten minutes, Hongtu found a high-grade ore vein that no other demons had mined.

Hong Tu immediately urged his body and rushed towards the place where this high-grade ore vein was located, and Hong Tu stopped in an abandoned mine. The cave is not completely dark, and there is a slight green glow on the ore of the mountain, and the ore that emits this light is also an associated ore of obsidian ore. When Hongtu's divine sense swept over the layers of ore, he found that there was a large amount of high-grade obsidian in this vein.

In this cave, many large and small pits were originally dug out, but two or three meters away from this high-grade obsidian, there was no trace of ore mining. In other words, the mine cave in front of Hongtu only needs to dig two or three meters into it to find high-quality obsidian in this rock. The worst grade of obsidian in this rock layer is also medium-grade obsidian ore, and there are high-grade obsidian ores in the deeper ore layers, although there is no top-grade obsidian ore, but after these medium-grade and high-grade obsidian ores are sold to Hongtu, it is enough for Hongtu to exchange for hundreds of millions of low-grade magic stones, which is a great wealth for the demons living in the demon world.

From within his dantian, Hong Tu summoned a spirit weapon flying sword, and then Hong Tu directly used the spirit weapon flying sword to dig in this rock layer. Because the spirit weapon flying sword is much sharper in the demon realm than on the earth, so Hong Tu excavated these rocks very quickly, and it only took a few minutes for Hong Tu to dig out the obsidian ore in the rock layer two or three meters deep. This rock layer is either green or white, and when Hongtu sees a pitch-black ore appear in front of his eyes, he knows that the obsidian ore has finally been excavated by himself.

This obsidian is dark all over, and it still shines with black light from time to time, and there is a trace of black mist suspended next to the obsidian, and this trace of mist is the magic power required by the demon cultivation. The demons in the demon world use obsidian to refine their own weapons, because obsidian can store magic power, can increase the combat power of demons using weapons, and is a very practical ore for demons to make weapons. And the production of obsidian veins in the demon world is very rare, so the value of obsidian in the demon world will be very high.

Seeing the obsidian shining with black light in front of him, Hong Tu accelerated the speed of digging ore again, and took out the three spirit weapons he had refined before, and Hong Tu used his mana to urge the four spirit weapons to start digging the obsidian ore in the rock layer. Because the obsidian vein excavated by Hongtu was a waste mine abandoned by other demons, there were no other demons digging obsidian ore here near this obsidian vein excavated by Hongtu. Hong Tucai can use his mana with confidence, urging the spirit weapon flying sword to dig the obsidian ore in the rock layer, after all, such a large area of high-grade obsidian ore, the demon who excavates the obsidian ore in this whirlwind mountain, will also be tempted when he sees these obsidian ore, and their living materials are all needed obsidian ore, in exchange for the mine guards on the whirlwind mountain.

In the eyes of the mining demons on Whirlwind Mountain, a large amount of high-quality obsidian is equivalent to a large amount of living materials, and with a large number of high-quality obsidian ore, they can get more and better living conditions. Of course, these mining demons know that it is impossible for them to leave Whirlwind Mountain in this life, so they all live one day at a time, and they need to dig obsidian ore in the mine desperately for a meal and a bowl of water every day, in exchange for the enjoyment of being on Whirlwind Mountain.

Under the control of Hong Tu, the four spirit weapon flying swords were digging out the obsidian ore in the rock layer at a very fast speed, and the time was only about half an hour, and thousands of catties of obsidian ore were piled up around Hong Tu. Of these obsidian ores, the majority of them are of intermediate quality, and only about one-tenth are high-quality obsidian ores. The value of these thousands of catties of obsidian ore is equivalent to millions of magic stones.

Because the obsidian ore in the rock layer has not been completely excavated, these obsidian ore piles up around Hong Tu, which does not affect Hong Tu to continue to excavate the obsidian ore in the rock layer, so Hong Tu has not put these obsidian ore into his space ring now. Watching the obsidian ore in the rock layer being continuously excavated, Hong Tu felt very satisfied, because these obsidian ore ores are equivalent to a large number of magic stones in the demon world, as long as Hong Tu excavates the obsidian ore in this cave, the magic stones sold by these obsidian ore mines are enough for Hong Tu to use in the demon world for a long time.

Just when Hong Tu was engrossed in digging the obsidian mine, a sturdy demon in rags was walking in the direction where Hong Tu was, and the ragged demon entered this abandoned mine cave entirely because it wanted to rest for a few days, and it had already exchanged it for more than ten days to use living materials, so there was no need to continue digging obsidian ore in exchange for living materials in the past few days.