"What the hell is this, so corrosive. The strength of my flesh is not easy to damage even an ordinary blade, and this black mist only corrodes and carbonizes all the skin in an instant. ”

Sun Li had palpitations, and nodded gratefully at Zhan Taixuanji to express his gratitude. With his knowledge, he had never heard of such a strange black fog, and if there was more of this black fog, I am afraid that the two of them would not even have a place to stay.

"No wonder there aren't any animals here, this black mist seems to be very corrosive to flesh and blood, and those plants are completely unaffected. Sun Li said.

"Indeed, it seems that the weirdness here has a lot to do with the black fog, but I don't know where this black fog came from?"

The two couldn't figure it out, Sun Li had already explored the surrounding area many times, and they didn't find anything strange. The black fog came strangely, and without any warning.

The two of them had carved a small groove in the stone wall, barely enough for them to stop. The stone wall was also extremely hard, and it took a lot of effort for the two of them to barely chisel such a groove.

"If this black fog doesn't dissipate, we're afraid we'll be trapped here. Xuanji said with a frown. Fortunately, next to her was Sun Li, who was still a child in her eyes. If it were a big man, Zhan Tai Xuanji would have been unable to stand such close contact.

"Probably not, there was no black fog when we fell, it is very likely that this black fog appeared every once in a while, but I don't know how long it will take. ”

The two of them stayed on the cliff for three days, but fortunately they had prepared Bigu Dan and drinking water before, otherwise they would have been hungry for the past three days.

"Look, the black fog is disappearing!" Sun Li said as he woke up Xuanji on the side. The two of them didn't go down as soon as possible, so as not to make another rebound of the black fog, and it would be worth the loss.

"Huh, you see that the black fog seems to be gathering in the direction of that pool?" said Zhan Taixuanji suspiciously. The two of them stood in a high position, so they could see the direction in which the black fog had dissipated, which was the small waterhole where the two of them had taken water before.

Sun Li touched his chin with his right hand and fell into deep thought. Sun Li didn't care about the waterhole before, but he felt that the waterhole was very deep. Now that I think about it, that waterhole is a little weird.

There is no vegetation around the waterhole, and there are no living creatures here, so there should be a lot of plants around the normal waterhole. The black fog is not harmful to the plants, so there should be no possibility of the plants next to the waterhole being destroyed, so why is there no grass growing at all?

"Elder Zhan Tai, don't you think that waterhole is very weird?" Sun Li told Xuanji his thoughts, Zhan Tai Xuanji was stunned, feeling that what Sun Li said was very reasonable.

"Sun Li, your idea is very reasonable, but we don't know the strange situation of the waterhole now, and it is impossible to enter it easily. In case the black fog is hidden under the pool, it is very likely that there will be no return. ”

"What the elder said is that I think so, let's also explore all the places I marked before according to the previous idea, and then always pay attention to the movement of the black fog to see if we can find out the law of the black fog. If we still don't find a way out after all these points have been checked, then we can only take a risk. ”

Zhan Taixuanji nodded, what Sun Li said was the best way at present. The two returned to the surface and began to probe their surroundings.

Two months have passed under such a boring exploration, and Sun Li and the two have already investigated all the points. Not surprisingly, no way out was found, but the two of them figured out the law of the black fog.

"The black fog appears every seven days, and each time it lasts for three days. This black fog appears too regularly, and I feel that it is likely to be either operated by humans or supported by a similar formation. Sun Li said.

"You're right, when I go to the waterhole today, I will look into the depths of the waterhole. The pool was so deep that my mind couldn't reach the bottom. However, I noticed some strange carved stones next to the waterhole, and there were many patterns on those carved stones that I had never seen before, very similar to formations. ”

Zhan Tai Xuanji relayed the discovery to Sun Li one by one, and Sun Li put forward a bold guess based on the law of the appearance of the black fog before.

"Miss Xuanji, have you heard of the Black Stone Spirit Vein?" After two months of relying on each other, the relationship between the two became a little closer, and Sun Li no longer called Zhan Tai Xuanji as an elder.

"I've only heard of spiritual veins, but this is the first time I've heard of this black stone spiritual vein. Is there anything to say about this black stone spirit vein, and what does it have to do with that waterhole that is not successful?"

Now Zhan Tai Xuanji is used to asking Sun Li if she doesn't understand, she found that Sun Li knows very well both in practice and in all kinds of strange things in the world, and she will ask Sun Li if she doesn't understand anything now.

"The Blackstone Spirit Vein is a way of saying it, but it's actually similar to the Spirit Vein. Spirit stones are also abundant in the spirit veins, but there is a black spot in the center of these spirit stones. The spirit stone with black spots is called the black spirit stone, and there is a corrosive aura in the spirit stone, if it is absorbed too much, it will cause the aura in the body to be corrosive, and all the meridians and internal organs of the person will be corroded. ”

Zhan Taixuanji's eyes widened, it was the first time she had heard that the aura in the spirit stone could corrode people's spiritual veins and organs, and she looked at Sun Li incredulously.

"The world is so big that no one dares to say that they truly understand the world. Although I knew about the existence of the black spirit stone, I had never heard of the black spot in the black spirit stone that could drill out of the spirit stone and form the terrifying black mist before. ”

Sun Li is all speculating, but after two months of his research, he feels that only this explanation can explain the weird black fog here. Moreover, this black mist is extremely similar to the black dots in the black spirit stone, and I feel that my guess is almost inseparable.

"Now we need to figure out the reason for the formation of these black fogs, and the secrets under the pool. With the cultivation of the two of us, it is enough to stay in the water for half an hour, and Miss Xuanji, you estimate that you can grow longer, and at most a quarter of an hour. We must calculate the time to enter the water and try to maximize the time of holding our breath to check the situation below. ”

In the past two months, the two of them have not advanced an inch of cultivation, the aura here is thin, and most of the time they are looking for a way out, and they have no time to cultivate at all. And the martial artist also needs the support of aura to cultivate the flesh and blood, if the two of them can't find a way out, then after the food here is consumed by them, they can only starve to death here.

"We can only give it a go, and tomorrow we will go into the waterhole to find out. Zhan Tai Xuanji's eyes were firm, her Dao heart was strong, and even if her life was in danger, she would not shake her Dao heart.

"Well, it's better than being killed here. Sun Li smiled, he was a bold man, otherwise he would not have died inexplicably in the previous life, at that time, he was the only one in the entire sect who dared to disobey the sect master's order to enter the dangerous place alone to find the sect master.

The two rested for the night, and the next day at dawn they came to the waterhole. Looking at the endless pool, they looked at each other, and then jumped down.

After descending a distance of dozens of meters, the two of them did not find anything strange, but they could already feel the appearance of water pressure. The two continued downstream, and after a hundred meters, they finally saw the carved stones found by Xuanji.

Sun Li came to the carved stone to observe, revealing a look of surprise. He had seen the lines on it, and it was very similar to the lines on the bronze door in his previous life.

"How is it possible? The coercion of the bronze door is not something I can get close to, it is definitely a very ancient existence. And my rebirth is definitely related to the bronze door, so what kind of existence is that, and why is there a moment like this pattern?"

Seeing that Sun Li was a little in a daze, Zhan Tai Xuanji pushed him, Sun Li woke up from his contemplation, looked at Zhan Tai Xuanji with an inquiring look and shook his head.

Sun Li continued to observe and found that a total of sixty-four similar carved stones appeared below. The placement of these carved stones is very particular, and they are placed in the sixty-four hanging positions of the five elements and eight trigrams.

This is obviously a formation, and it is a formation that Sun Li has never seen before. It's just that this formation doesn't know if it requires the intervention of any external conditions to trigger, or if it's just a circular formation that takes a specific amount of time to activate.

Sun Li glanced at Zhan Tai Xuanji and motioned for her to continue. The carved stone is placed on a slope, and the middle position is deeper.

The two of them continued to swim to the depths of the pool, and the distance was nearly 100 meters, and finally reached the bottom of the pool.

The two stood at the bottom of the pool and looked around. It's like a funnel, but there's no exit at the bottom. Sun Li picked up the soil with his hands, and the half-meter-thick soil quickly opened for him. Then some hard rock is exposed.

Sun Li glanced at Zhan Taixuanji, and then made a chopping motion at the rocks. Zhan Taixuan understood and slashed at the rock with a sword. Several cracks appeared in the hard rock in an instant.

Zhan Tai Xuanji continued to slash, and the rock slowly shattered, and then a bright light appeared. When you look closely, it is actually a spiritual vein, which is the so-called spiritual stone mine.

The two of them were stunned, these spirit stones were actually top-grade spirit stones, even if they were large spirit veins, there would not be so many top-grade spirit stones. The two knocked down a few spirit stones, then looked at each other and swam back towards the pool.

"Sun Li, it seems that your guess is correct, there are really some black spots among these spirit stones. After the two of them went ashore, they picked up the spirit stones and observed them carefully, and found that there was a black spot in the center of these top-grade spirit stones.

"Before, I thought I might have guessed wrong, but now it seems that my guess is already eight or nine ten. There are definitely other secrets beneath the waterhole, and if we can unravel them, maybe we can really find our way out. ”

Sun Li touched his chin in contemplation. The carved stones with the same pattern as the bronze door, the placement of the sixty-four hexagrams, and these superb spirit stones and spiritual veins full of black spots, what is the relationship between them. Solving these questions may be able to find the crux of the problem, and it is possible to find a way out.