Ninja training chakra is created by combining both physical and mental energy. Practicing immortal art is a combination of physical energy, spiritual energy, and natural energy.

After Yichen failed twice, Onoki took Yichen to the secret room where the ninjutsu scroll was placed, and asked Yichen to read the S-class secret vault used to practice Chen's escape.

The purpose of this S-class vault has long been known, and it is about how to fuse the three chakras.

Now Yichen is practicing immortal arts, although it is not a fusion of three chakras, but it is also a fusion of three energies, Onoki doesn't know if this secret treasure will help Yichen, but it doesn't hurt to try.

In Yichen's plan for himself, there is the development of blood succession elimination, so he has been coveting this secret for a long time, and he has not exchanged it with Ohnogi before, first, he can't use it for the time being, and secondly, the S-level secret is not like ninjutsu, and it is not clearly priced, and it will only be taught when the earth shadow feels that you need it and you are qualified.

Yichen never expected that there would be such an unexpected joy in cultivating immortal arts.

If it weren't for the fact that this cultivation of immortal arts made Onoki feel that it had something to do with the cultivation of Dust Escape, God knows when he would have handed over this S-class secret treasure to himself. Or maybe it will never be given to yourself.

So Yichen cherished this opportunity and read it very carefully.

An hour later, Yichen made sure that the S-Class Vault had been fully memorized before closing the scroll.

Onoki cast another seal spell in Yichen's mind, and the two of them left the secret room.

Onoki has to go to the Tsuchikage's office to deal with the never-ending papers, and Yichen has to go back and think about how to integrate the natural energy.

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Yichen came to the training ground, watching the three disciples practice, while thinking about how to integrate natural energy.

After half a year of growth, Yichen's three disciples have made significant progress.

Starling Saki, a geek who practices ninjutsu, has now completely understood the two B-grade ninjutsu handed over to her by Yichen, but she is limited by the lack of chakra and cannot use it for the time being.

In addition to these two B-rank ninjutsu, Saki Kostarling is already planning an upgraded version of her Wind Tornado.

The little girl was very smart and knew that even if she developed a B-rank ninjutsu, she wouldn't be able to use it for the time being, so she came up with a transitional version of ninjutsu.

In addition to Feng Dun, which was the first attribute she cultivated, Xiao Starling Shaji has recently been developing the fire attribute again. It's just that the development of this second property is not yet complete.

And Nobuya Matsutani, after experiencing a change in mentality, seems to be much more stable. At Yichen's suggestion, he took the path of erudition. His three attributes go hand in hand, and now he has learned at least six C-rank ninjutsu for each attribute.

Instead of taking the path of developing ninjutsu like Kostard Saki, the fighting style chosen by Matsuya Shinya was to give full play to the advantages of his multiple attributes, and because there was a water attribute in the three attributes, he inherited the water pressure line water escape ninjutsu developed by Yichen.

The fastest progress is Zhuo Si, Yichen actually has the least help to Zhuo Si, Zhuo Si is the same as Chuanbei in Yichen's previous batch of disciples, they are all physical ninjas, and Yichen is not the same type, so Yichen can not give much help.

But perhaps it was stimulated by the carelessness of almost dying in the face of Konoha Darkness last time, Zhuo Si's cultivation became even harder, and because of the experience between life and death, his efforts were more rewarded.

Now Zhuo Si's physical foundation is already very good, and Zhuo Si, who has kept up with all indicators, is no longer the student who was serious about the subject before. And his speed expertise has also improved rapidly with the improvement of his physical fitness.

The only regret is that there has not been much progress in the teleportation technique. This gave Yichen a lot of headaches.

Today, the three little guys are training and cooperating, because after a while, the joint middle ninja exam held by Iwa Shinobi will begin.

There are a lot of ninja villages participating in the joint middle ninja exam held by Iwa Shinobi this time, in addition to Iwa Shinobi himself, there is also the big country of Sand Shinobi, and there are also several medium-sized countries such as Rain Ninja, River Ninja, Grass Ninja, and Taki Shinobi.

The momentum is already not small, and the only regret is that Yun Ren did not participate.

At Yichen's suggestion, this time Iwa Shinobi also promised to come up with a powerful attack B-rank ninjutsu as the prize for the first place. As long as the Iwa Ninja Village has it, you can choose any of the five attributes.

This can be said to be a big deal, you must know that the last time I made peace with Konoha, Iwa Ninja Village didn't get much ninjutsu. And those ninjutsu paid by Konoha are the most picky and picky, and they think they are the most useless.

The preciousness of ninjutsu can be seen from this.

As Yichen's disciples, of course, the three of them are not greedy for B-level ninjutsu, they don't want to lose Yichen's face as a teacher. Because they remember very clearly that Zhizihui was recognized by everyone under the spotlight.

At that time, some of the three people were in the audience to watch Chikomemi's performance.

In particular, Kostard Saki has always been working hard with the goal of Chikohui, and she also wants to become a qualified Zhongnin like Chikohui in the eyes of everyone. It adds another brilliant stroke to the halo of Yichen's famous teacher.

Yichen knew what the three disciples thought, but he didn't have much hope for the three disciples. The strength of the three of them is already good, and it is not difficult to become a middle ninja, but it is not easy to stand out in this middle ninja exam. After all, it has only been more than a year since the three of them graduated, and although they have made great progress in more than a year, they are still a lot worse than the geniuses of the same period.

When Chiko-hui was indeed recognized under the gaze of everyone. But everyone recognized Chikohui, not because of how outstanding her strength was among the candidates that time. It's because she has reached the level of forbearance so quickly with her natural powers, which makes everyone see hope.

If the three of them were allowed to participate in round after round of competitions at that time, the probability that any of the three of them would be able to stand to the end was actually not high.

Therefore, Yichen's requirements for the three of them are actually not high, as long as they can pass the assessment.

Therefore, although the three of them have been practicing very hard recently, Yichen has not intervened too much, and Yichen has chosen to let it develop naturally.

The three disciples practiced and cooperated, and Yichen practiced on the side by himself, and after a while, Xia Yue also came to this training ground after school. Of course, Xia Yue didn't take the initiative to come, this girl is lazy when she can be lazy about cultivation, and she is not self-motivated at all.

Yichen glanced at Xia Yue, who was pouting, and the little girl had to obediently go to the side to practice physical skills.

Xia Yue's physical fitness is not outstanding, it should be said that it is very average, but there are some peculiar talents in terms of mental power, but this talent, Yichen doesn't know how to develop it, so Xia Yue's strength is at the bottom of the class.

At the beginning, Yichen thought about making changes, but then he gave up, and the little girl could do whatever she wanted, as long as she completed her regular training every day. Anyway, the little girl still has a lot of time to graduate.

Seeing that everyone was practicing seriously, Yichen closed his eyes and began to recall the contents of the S-class secret vault.

Most of the content in the S-class secret vault has little to do with this cultivation of immortal arts, but how to deal with the three energies, the S-class secret vault has a lot of experience.

Yichen carefully analyzed this aspect.

After the analysis, Yichen felt that maybe Ohnoki should try it first.

Onogi, who can escape from the dust, is very good at fusing the chakra of the three attributes, and after absorbing the natural energy, it is definitely easier to fuse than Yichen.

The Dust Retreat cultivation method introduced in the S-Class Vault is as usual a step-by-step process, and there are methods on how to control three chakras at the same time.

Most importantly, the S-Class Vault also takes into account the fact that ninjas have an inconsistent level of mastery of the three attributes of cultivating Dust Escape. So a solution was proposed, which was to focus on the most unfamiliar attribute. In this way, although the proficiency level of the three attributes is different, the ninja is able to form a good balance because of the different energy allocation.

This method is very important to Yichen, who has mastered his physical strength and mental strength far beyond the natural energy of an outsider after so many years of ninja life.

After getting this method, Yichen had the idea of eagerly wanting to give it a try.

But Yichen still held back. The cost of each practice is not low, and before practicing, you must think of all possible situations.

Every time he thought of this, Yichen was very envious of Naruto. Iwa Ninja Village needs to spend a lot of money to get a drop of energy oil, which can almost be said to be inexhaustible in Myoki Mountain.

Naruto was able to practice the Immortal Arts countless times a day, but Yichen had to be well prepared to practice once every few days. In terms of the number of times alone, Naruto practiced for a day, and Yichen didn't know how many years he would have to practice.

Fortunately, Yichen's preparation was sufficient, whether it was balance exercises or energy fusion, Yichen was ahead of Naruto. In addition, Yichen far surpasses Naruto's ninjutsu cultivation experience, as well as sufficient analysis and preparation before each practice.

Therefore, the effect of Yichen's cultivation every time is far superior to Naruto's.

For example, when Yichen began his third practice three days later, Yichen's thorough preparation came into play, and Yichen focused most of his mind on controlling the natural energy according to the method in the S-Class Vault.

Begin to separate a small part of the natural energy from the large army, and then wrap him with two of its own energies.

Then, Yichen ignored the natural energy that was still frantically pouring in from the outside world, and began to fuse the three according to a certain ratio.

The ratio of the three is simply one to one, and there is no problem with that. The hard part is how to control it precisely.

At this time, Yichen discovered Naruto's advantage, Naruto had a huge amount of chakra, and he didn't need to control it precisely. As long as you find any shortcomings, you can add which one to it. But Yichen can't do it, if he follows Naruto's method, Yichen's chakra is consumed, and he can't achieve balance.

After all, Yichen can try and make mistakes too few times.

That's why Yichen chose to choose a small part of the huge natural energy and find the exact ratio first.

Chakra's miraculous Yichen is known, and Yichen believes that as long as there is one success, Chakra himself will slowly form a memory after that.

It's just that in this way, except for the part of the natural energy intercepted by Yichen, the other natural energy is not sufficiently constrained. Yichen's remaining chakra was completely suppressed by instinct, so Yichen's petrification process was also much faster.

As a result, in less than two minutes this time, Yicang had to interrupt Yichen's practice.

Next, before the arrival of the Zhongnin exam, Yichen made three more attempts, although they all failed, Yichen still slowly found some doorways.

Although Yichen didn't know how much time it would take to fully practice the immortal arts, Yichen had a feeling that with just the small amount of natural energy he had mobilized, Yichen was about to complete the fusion.