Because the further down he went, the stronger Li Fei felt the aura, and even felt that the air was full of spiritual power!

In the process of moving forward quickly, Li Fei gradually calmed down his restless mood, and at the same time, he further felt the cruelty of the cultivation realm, without strong strength or the protection of the sect, female cultivators can be reduced to sex slaves, but what about male cultivators? I am afraid that they will either engage in some dangerous work and become super coolies, or they will only have to die.

After thinking of his possible situation, Li Fei felt an invisible pressure pressing heavily on his heart, and the idea of quickly improving his cultivation became even stronger! There was a sense of urgency to seize the day, and he felt that he must improve his strength as soon as possible, and only by having strong strength was the only way to protect himself and his friends!

After traveling more than 100 zhang quickly, Li Fei came to a small cave with a radius of only a few zhang, and found that the aura here was more dense than any place he had seen before, and he never even thought that the aura could be so thick!

Li Fei saw at a glance that under a stone wall with a crack, a spiritual spring that was only a foot square had also been formed! As for the spiritual spring, Li Fei had heard Yue'er mention it, and it was very rare.

The so-called spiritual spring can only be formed under certain conditions, in addition to requiring a particularly strong spiritual energy, a long time, a relatively closed space, and a series of special natural environment requirements.

Before, Yue'er just guessed that there was a small spiritual vein under this small valley, but she didn't expect that there was a spiritual spring.

Li Fei estimated that the "Four Evildoers" were probably not the first to discover this place, perhaps robbing others of their achievements.

However, the previous events have nothing to do with Li Fei. With such a rare treasure land, Li Fei decided to cultivate here for a while, anyway, there was no suitable place to stay, so he took this place as his home for the time being.

Half an hour later, Xue'er and the other six people also came to this small cave, and all the things on it had been dealt with.

"This place is really good, it has actually formed a small spiritual spring! Li Fei, it will be much easier for you to build a foundation here. Xue'er looked at it and said happily.

"yes! I'm happy with it too. What about them, they're all leaving?" Li Fei still casually asked about the whereabouts of the rescued female cultivators.

"All left. I told them that the 'Four Great Evildoers' had been destroyed by the Lingyun Sect, and from now on, this place will be owned by the Lingyun Sect. Cher said happily.

"There are a few people in the early stage of foundation building, and you haven't considered accepting them?" Li Fei asked a little curiously. After all, in the later stage of Sisicai's chemical weapons, Xue'er accepted them, and Li Fei thought that the strength of the other three early stage of foundation building was definitely stronger than Sisi, only in terms of strength, it made no sense not to accept it.

"The three of them have been maliciously mined for a long time, and they have already hurt their foundations, and their lives have stopped at the early stage of foundation building...... As for the others, I didn't find the more potential. Xue'er sighed softly and said quietly.

"I'm starting to prepare for building the foundation now, and I'm already clear about the process and difficulty of building the foundation, and the recent war has also collected a lot of Tsukidan, I hope I can get my wish, you don't have to worry about me, and act freely. Li Fei said with some excitement.

After everyone blessed Li Fei, they left the small cave. Before leaving, Sisi and Lingling were a little lost, because the two of them were also in the late stage of chemical weapons, and they were still some distance away from impacting the foundation.

To have the opportunity to impact the foundation near the spiritual spring, not everyone can achieve it, after all, the good place has long been robbed, for low-level cultivators, it is already very happy to be able to find a place with a strong aura to build the foundation, Li Fei also somewhat understands that this kind of condition is something that can be met but not sought, but it is just that Sisi and Lingling feel it deeply.

Next, Li Fei made a brief preparation, cleared out all the things that might be needed, put them in an independent bracelet, and then adjusted his mental state and began to cultivate.

Three days later, Li Fei felt that his body and spirit had reached the best state, and all the preliminary preparations were in place.

Seven days later, Li Fei felt that he could try to break through. In order to alleviate the influence of the fierce medicinal power of the Zhuji Dan and achieve a relatively smooth transition, Li Fei set up a spirit gathering array in the cave, and the pure and thick aura instantly increased several times, and the speed of cultivation was greatly accelerated......

On the tenth day after the retreat, Li Fei felt a little nervous, stopped practicing, found Xue'er and the others to communicate, and adjusted his mentality.

Finally, after chatting with everyone for a while, Li Fei also took a very comfortable bath in the hot spring, changed into a new sportswear, and walked into the small cave where the spiritual spring was located again.

It took Li Fei an hour to adjust his state to the best, and took out a brown pill, only the size of a soybean, which was Zhuji Dan.

In the two consecutive battles with the "Four Great Evildoers", Li Fei's harvest was very rich, and many things had not had time to check and confirm their use one by one, but the most urgently needed Zhuji Dan was all found, and a total of ten grains were harvested, which was already a very luxurious luxury for ordinary cultivators in the late stage of chemical weapons.

In ordinary casual cultivation, it takes a lot of chance to get one, and ordinary sect disciples usually get one at a critical moment or after making a lot of contributions, which fully shows that Zhuji Dan is very precious to cultivators in the chemical martial arts stage.

Zhuji Dan, as the name suggests, can improve the success rate of foundation building, in general, ten chemical martial arts late stage cultivators impact Zhuji, without using Zhuji Dan, it is very good to have two successes, and using Zhuji Dan can increase by 30%, so that five people can enter the foundation building period.

After taking a deep breath, Li Fei took a pill of Zhuji Dan, and then used all his strength to start refining the medicinal power!

Tsukidan melted in his mouth, turning into an extremely surging spiritual power, and at the same time, it was also mixed with an extremely strong destructive force, like a wild horse that had escaped from the reins, rampage!

Li Fei ran the Tianchen Technique with all his might, and after several hours of hard work, Li Fei felt as if there was a fire burning more and more in the dantian, gathering powerful energy, and the whole body was also hot, and dense beads of sweat had appeared on his face!

From the experience of others, Li Fei knows that the critical moment may soon come. Sure enough, this feeling only lasted for a moment, and the fire in the dantian suddenly disappeared without a trace. Li Fei was even more nervous, further accelerating the operation of his mana, and making every effort to meet the upcoming strong impact.

Suddenly, like a silent thunderstorm, Li Fei felt a sharp pain suddenly coming from the dantian, like countless sharp knives stirring at the same time......

Although he was prepared, it came too violently, Li Fei's face suddenly became extremely pale, beads of sweat the size of soybeans kept falling like rain, and his whole body kept shaking because of the severe pain......

Then, the sharp pain at the dantian instantly erupted, turning into countless heat streams, spreading all over the body along the meridians, and that pain had penetrated deep into Li Fei's bone marrow!

Li Fei gritted his teeth and insisted, this kind of torture that surpassed any torture lasted for more than half an hour before it gradually subsided. At this time, Li Fei was already sweating profusely, and some light gray substances were mixed with sweat, sticky, and exuding a sour smell. At the same time, a wave of tiredness hits, making people drowsy......

Li Fei was a little disappointed, this time the impact on the foundation building failed! After carefully examining his body, Li Fei showed a hint of a smile, and this effort was not in vain.

The Zhuji Dan just now has achieved a certain effect, allowing Li Fei to preliminarily complete the washing of the marrow and easy tendons, the tendons and veins have widened a lot, the flow of mana is smoother, and the efficiency is higher, although it has not succeeded, but it has laid a more solid foundation for the impact in the future.

After cultivating and recovering for more than ten days, Li Fei repaired all the minor injuries left by the impact on the foundation, and at the same time absorbed all the remaining medicinal power.

In the process of absorbing the residual medicinal power, Li Fei made an unexpected discovery. Through the communication with Xue'er and the others, Li Fei knew that after an ordinary cultivator took the Zhuji Dan, it was impossible to completely absorb the medicinal power, and it would be good to be able to effectively use sixty or seventy percent, but his own absorption of the medicinal power had reached more than ninety percent!

After Li Fei adjusted his state again, he launched the next round of impact. Due to a painful experience, I felt a lot better this time, and the impurities in my body were discharged a lot.

However, what made Li Fei feel very depressed was that he failed again! Li Fei thought to himself: "Listening to Xue'er and the others, it is not very difficult to build a foundation! Failing continuously, it seems that his potential is really not very good!"

At that time, I heard Xue'er say that those female cultivators had average potential, so Li Fei wanted to ask what this potential was, but out of an uncertain concern and a question of face, he didn't raise it.

A few days later, Li Fei took the third pill of Tsukidan. This time, the pain lasted for a particularly long time, not only pain, but also tingling, all kinds of uncomfortable feelings kneaded together, making people feel that they could not hold on for a moment, and the taste of it was not experienced in person, and it could not be expressed in words at all......

Of course, the effort finally paid off, and the mana in Li Fei's dantian began to change, showing signs of gathering from the original relatively loose state, and with the passage of time, it slowly developed from quantitative change to qualitative change, and the mana began to transform into a true element!

The emergence of the true element brought about a series of chain reactions, starting with a little bit, and then skyrocketing at a rate of more than ten times!

Every time Li Fei carried out a cycle of Zhoutian, the True Yuan became a little stronger, and the transformation of the muscles and veins became faster, and of course, the pain and tingling became more intense! Li Fei felt that he might not be able to hold on and collapse at any time......

An hour later, all the mana in Li Fei's body had been converted into true yuan, due to the change in state, after the mana that was once filled in the dantian was turned into true yuan, it only filled a very small part of the dantian, and most of it was empty!

At this time, it reflects the important impact of choosing the advantages and disadvantages of the foundation building, if you want to build the foundation successfully, you must let the dantian be completely filled with the true element at the fastest speed, if you stop halfway, it will fail, and the existing true element will also disappear, if you want to impact again, the difficulty will increase exponentially!

And in order to completely fill the dantian with the true element, the only way to keep inhaling a large amount of spiritual energy and quickly transform it into the true element of mana, there can be no pause in the middle, and the transformation speed will fail if it is too slow, so the thickness of the spiritual power of the foundation building place is very important.

Of course, you can also continue to use Tsukidan, but this kind of pill specially used to break through the bottleneck is not infinitely edible, it is a three-point poison, and to a certain extent, it is also applicable to the cultivation world, and eating too much Tsukidan in a short period of time will also have serious consequences - poisoning and death!

And the important role of a foundation building place with abundant spiritual power is also reflected here, which can quickly and smoothly provide sufficient spiritual power, as long as there is enough time and no one disturbs, it is only a matter of time before the foundation is successful, of course, the premise is that it can successfully transform the true element.

After another ten days, Li Fei ended the retreat, which took more than a month. As a result, Li Fei was quite satisfied, and finally crossed the important threshold that blocked countless cultivators in the chemical martial arts stage, and reached the coveted foundation building period! On the road of cultivation, he took another important step!

After going through a lot of hardships, he finally became a member of the foundation building period, and Li Fei showed a happy smile...... At the same time, it also means that his growth space has improved by a big step, not to mention the ultimate goal of immortality, at least in the dangerous Xiuzhen world, there is more power to protect himself!

Li Fei was about to continue to consolidate his realm and study the Heavenly Dust Technique to find out what magical powers could be suitable for his cultivation, when Xue'er rushed in with a anxious face!