This hole carved out of the rock wall is very small, about twenty centimeters wide, whether it is the previous divine sense investigation or observation with the naked eye, there is no existence of any mechanism or formation, Duan Zifeng can't help but secretly wonder, it stands to reason that since the outer hole is tightly protected by a formation, there should also be a corresponding protective formation inside!

There was only a small roll of animal skin and a thin book in the cave, in order to be on the safe side, Duan Zifeng picked it out with an alloy knife, and there was no accident, first opened the animal skin to take a look, Duan Zifeng immediately understood.

The animal skin is a message left by the original owner of this cave, to the effect that this is to solve the strong enemy faced by the family, the other party is too powerful, life and death are uncertain, may not go back, if there is really an accident, someone found this cave, please take care of the descendants of his family, and he is willing to teach what he has learned all his life, that is, the thin book, signed Nan Ruotian, the time is 20,000 years ago!

20,000 years! Duan Zifeng was shocked! This cave was actually left by a monk 20,000 years ago, and the protective formation outside the cave was still so terrifying after 20,000 years, and the monks of the Ning Yuan Realm who violently broke the formation in ten seconds were wiped out!

He hasn't been able to come back for 20,000 years, and it seems that this monk named Nan Ruotian must have not escaped that catastrophe! After such a long time, I don't know if there are any descendants in his clan that will continue, and if so, he may really have to pay off today's karma in the future! Duan Zifeng sighed secretly, and then opened the book.

After a quick glance through a few pages, Duan Zifeng found that this is a book about the experience of the formation, the formation is an important knowledge used by monks to resist the enemy and defeat the enemy, according to the use, it can be divided into four categories: defense array, killing array, phantom array, and auxiliary array, the first three needless to say, the auxiliary array is slightly more complicated, mainly playing a variety of auxiliary roles, such as the spirit gathering array, which can gather the aura of heaven and earth to assist in cultivation, the heavenly vision array, which is used to greatly enhance the scope of divine consciousness coverage, and refining Dao weapons, Formations are required for pills and talismans, so formations can be said to be one of the most important disciplines in the cultivation realm.

However, the book is mainly some of Nan Ruotian's experience, but there is no explanation of the basic knowledge of the formation, Duan Zifeng didn't understand half a point after reading it for a while, and after a quick flip, he quickly turned to the last few pages, and Duan Zifeng, who was about to put the book away, suddenly looked at it carefully.

The last few pages are actually recorded in the formation arranged by this cave, the formation is called the Sanhe Tian Supplement Formation, this formation is the unique formation that Nan Ruotian is proud of, the so-called Sanhe refers to the combination of three different functional formations, anti-formation, Phantom Array and Spirit Gathering Array, Duan Zifeng doesn't know the formation, and he doesn't know how difficult it is to combine different formations, but from Nan Ruotian's narration, he can vaguely feel Nan Ruotian's pride, the power of the Sanhe Heaven Supplement Array is not how powerful the defensive strength is, the special thing about this array is that it skillfully combines the Spirit Gathering Array, and the aura gathered by the Spirit Gathering Array can continuously provide energy to the large array, although it cannot fully meet the needs of the formation, but it undoubtedly greatly reduces the consumption of Yuan Shi.

Duan Zifeng suddenly realized, no wonder this outside formation can stand for 20,000 years without destruction, and in the end, it has the energy to destroy more than a dozen Ning Yuan Realm masters, it turns out that this is the reason!

However, since Nan Ruotian was ready to leave the experience of the formation to future generations, why did he want to open such a formation that could protect tens of thousands of years? Isn't this a bit contradictory? Duan Zifeng thought about it for a while, and roughly guessed the reason why Nan Ruotian arranged it like this, he should have arranged it like this just in case, the wealth in this cave and his experience in the formation, it is impossible to consider outsiders first, and at that time, he should have told his clansmen about this place, but he couldn't be sure whether the people he notified could survive, so he left this behind, if the clansmen could survive, they would naturally know the way to enter the formation, but if the clansmen who knew about it were also not spared, then leaving such a faint fire was better than nothing!

Duan Zifeng has learned the scheming of people in this world many times, and he has no doubt that Nan Ruotian will think so carefully, whether it is right or not, it is already a fact that he has discovered this place by himself.

The book not only explains in detail how to arrange the Sanhe Heaven Supplement Array, but also teaches the method of how to enter, but this array has now exploded, and it is useless to look at it now, so Duan Zifeng turned another page.

This last page made Duan Zifeng's heart happy, it turned out that in addition to the Sanhe Heaven Supplement Formation outside the cave, there was actually a preparatory formation, which could not be called a preparatory formation, the time of this formation was still before the Sanhe Heaven Supplement Array, called the Liangyi Seven Star Array, Nan Ruotian had always been the Liangyi Seven Star Array to exercise the duty of guardianship before the Sanhe Heaven Supplement Formation, and later after the Sanhe Heaven Supplement Formation was arranged, this set of formations was not dismantled.

What made Duan Zifeng happy was that the book not only explained in detail the mystery of the Liangyi Seven Star Array, but also pointed out the location of the main formation disk, as long as the main array disk was replenished with the required yuan stones, this formation could be restored immediately!

Duan Zifeng is not a greedy person, since there is no way to mine the Yuan Stone now, he will not force it, he was going to leave, but if there is a way to pocket it, he will naturally not refuse, and now this Liangyi Seven Star Array is a thing to send charcoal in the snow!

Coming to the passage leading to the outside, Duan Zifeng took a closer look, and sure enough, he found a mechanism to open the main array plate on a wall, stretched out his hand and pressed it the stone wall that looked unmistakable on the surface, there was a slight friction sound on the ground, and a circular stone slab with a diameter of more than five meters exposed the ground, Duan Zifeng took a lot of effort to remove the stone slab on the surface, revealing the main array disk hidden below.

This thing seems to be made of some kind of metal, it is covered with all kinds of line patterns, dazzling to see, around the disc, there are twenty-three small holes, the size is exactly the same as the Yuan Stone, Duan Zifeng took out the Yuan Stone from the Star Ring, stuffed them into these small holes one by one, and then pressed the switch to open the formation, only to see the main array plate slowly descending, and the pattern on the surface seemed to come to life, overflowing with light and staggered.

Duan Zifeng covered the stone slab again, got up and walked towards the outside of the cave, looking out of the cave from the hole, there was no abnormality, but when he walked outside the cave and looked inside, where was there any cave entrance?

Duan Zifeng was sincerely admired, and after checking it for a while, according to the method of entry described in the book, he pressed it in the seven parts of the cave wall in the corresponding order, and a hole that only allowed one person to pass through appeared, and after Duan Zifeng walked in, the hole immediately closed up.

In the next few days, Duan Zifeng sat at the entrance of the cave, absorbing the energy in his body with the star ring, while studying Nan Ruotian's formation experience, but he didn't have any formation knowledge, and he didn't understand many professional terms, let alone understand the meaning of the words, and finally simply put it away and turned to study the books he had bought in Qianfang City before.

When he came to Canglan Star, Duan Zifeng felt like a newborn baby, there were too many things to learn, and he was exposed to things such as talismans, Taoist weapons, pills, and formations, these things that monks had to understand, but he didn't know anything, and the "Ten Thousand Beasts Spectrum" Waiting for books is like a kindergarten book, and these are the only things he can read now, but for understanding the world, these books can be said to be the most suitable, these are far from enough, Duan Zifeng thought that after arriving in Qianfang City, he would buy some similar reading materials, and if he wanted to integrate, he must understand it first!

Four days later, the last trace of strange energy in Duan Zifeng's body was absorbed by the Star Ring, and the time was much faster than expected, mainly because the later it was, the faster the Star Ring absorbed, and the resistance of those strange energies became weaker and weaker.

Without the nuisance of strange energy, Duan Zifeng only felt relaxed, and immediately ran out to dig a big pit and buried all the dead monks, who couldn't bear to expose these people to the wilderness, and came to prevent people from discovering the abnormalities of this place.

After burying these people, Duan Zifeng looked around again, and found nothing abnormal, so he walked towards the outside of the valley with peace of mind, and came to Chichen Road after a short time, but, after leaving for five or six days, the two tamed beasts didn't know where to go, let go of their senses, there was no trace of them within twenty kilometers, it was estimated that they were harmed by the beasts in the mountains, and the group of gluttonous beasts was the most suspicious!

After thinking about it for a while, Duan Zifeng raised his hand, and a fiery red convertible sports car - Du Yang appeared in front of him, seeing this scientific and technological product on the earth, Duan Zifeng felt very cordial, opened the car door and sat down, after starting, the roar of the motor startled a group of birds on the side of the road!

Uh, the sound is really loud, but it doesn't matter, Duan Zifeng pressed it on the computer board, and the sound immediately became much smaller, this is the most advanced product, with two modes of fuel saving and racing, in the fuel saving mode, only two of the cylinders will be started, which is equivalent to an ordinary car, and the sound is naturally too small!

Anyway, if you want to use Duyang car to go to Zhenhai City to do business, take it out later and take it out early, it's all the same, as for why you have such a valuable yuan stone and go to Zhenhai City to do business, Duan Zifeng has his own ideas, if it is not necessary, he will not sell these yuan stones, because the yuan stone is too precious, and his understanding of this world is far from enough, rashly take out such a precious thing to sell, I am afraid that before he can exchange it for the Dao Dan, the trouble will come to the door!

Although it is a fuel-saving mode, the driving speed of Duyang car has easily reached 145 kilometers, more than twice as fast as the taming beast, spacious and smooth road, no other vehicles and pedestrians trouble, green trees on both sides, fresh air blowing in the face, Duan Zifeng only feels relaxed, this is really a good place to drive!