In the ring space, more than 20 days have passed, and in these more than 20 days, Long Xingyu has found all the classic collections of the six sacred mountains, and he has really found what he wants in the collections of the Chaos Divine Mountain.

"Yuan Shen Heart Fire", to be precise, this is a magic cultivation technique, and it is also a fire attribute cultivation technique, and it can cultivate a trace of heart fire in the body, and the heart fire turns nine times, and the power is endless. Although the word "Yuan Shen" is mentioned in the name of the exercise, this kind of technique does not need to be practiced until the Yuan Shen is cultivated, as long as the spiritual power can reach the materialization, then you can try to cultivate. However, this set of exercises is more troublesome to cultivate, because it is divided into many stages, and it is through the condensation of the materialized spiritual power or the power of the primordial spirit, and then constantly compressed, after different stages, after nine hundred and eighty-one days, the spiritual power is condensed to the extreme, and finally in the heart of the middle dantian with the heart of the heart to condense a trace of heart fire seed, and then continue to consume the heart and the energy in the body to supply it as nourishment, of course, the higher the level of energy provided, the less the heart and spirit are consumed, and the greater the power of the heart fire. After reaching the heart fire, it can be used to attack the opponent's primordial spirit and mind, and it can also effectively prevent the opponent's primordial spirit or mind attack, and the end is extremely powerful. It's just that the cultivation of this set of spells is too dangerous, and if you don't pay attention to it, you may be devoured by the heart fire, and when you cultivate, you need to constantly consume the power of the mind, so it is even more difficult to improve your strength. However, there are also benefits, when the Yuan Shen Heart Fire reaches the third turn, it can help improve the power of the Yuan Shen and the Heart God, and it can also incinerate the impurities in the Yuan Shen, making the Yuan Shen more refined. Moreover, after reaching the third turn, it can also effectively prevent the invasion of heart demons, and it also has great benefits for the improvement of state of mind cultivation. In general, this set of exercises is difficult to cultivate at the beginning, but as long as it is after the five turns, it will be of great benefit. If cultivators get this kind of mental method, they will be crazy to think about it, after all, preventing the invasion of inner demons also indicates that when they cross the mental tribulation in the heavenly tribulation, they can effectively prevent the intrusion of the inner demons and cause them to go mad, which will greatly increase the success rate of the tribulation, and this kind of exercise can be called against the sky. And this heart fire can also help the alchemy refiner, after reaching the fifth turn, in the process of alchemy refining, it can also continue to make up for the loss of the power of the mind, which also makes the refining process can greatly improve the success rate, and after this heart fire is promoted, after reaching the ninth turn, it can continue to evolve, as for what kind of level it can reach, it is not mentioned in the jade slip that records this skill, but it will not be bad.

With such a strong skill, Long Xingyu felt that it was simply tailor-made for himself, and he did not lack time. Spiritual power, he was already able to materialize at this time, and he had also reached the minimum requirements and could cultivate. After all, all it takes is a spark to generate a spark of heartfire. The energy used in the supply, one's own dantian energy is completely competent, and the grade is not low, maybe it can make up for the consumption of mental power.

Thinking of this, Long Xingyu decided to cultivate this set of skills first, taking advantage of the space of this ring, Long Xingyu planned to directly cultivate this Yuan Shen Heart Fire, and try to reach the realm of a turn in a short period of time, so that he could rely on his own strength to refine the weapon.

Finding a suitable practice for cultivation, Long Xingyu suddenly came to a secluded place, and after making sure that no one was bothering him, he sat down cross-legged.

The spiritual power had a good understanding of the information in the jade slip, and after making sure that it was correct, Long Xingyu began to refine the heart fire. The refining of this heart fire, first of all, is to improve one's own spiritual power to the extreme, and then compress it in the heart position, which has some difficulties, if you are not careful, maybe the heart will be squeezed and broken, and even if the gods come, it will be difficult to save it. And if you want to compress the spiritual power, it is also a test of the cultivator's will, in the process of compressing the spiritual power, it is bound to make people's minds extremely tired, and as long as there is a trace of relaxation, then the compressed spiritual power will cause a rebound, if this happens, the heart burst is light, and it is more likely that the mental power will be greatly hit, so that the mind will be affected to a certain extent.

It is undeniable that if Long Xingyu can successfully refine a trace of heart fire, as long as he continues to supply energy and continue to evolve and improve, this heart fire will inevitably bring great benefits to his cultivation at that time, but on the other hand, when refining heart fire, it is an extremely dangerous process, and if he is not careful, it will inevitably be destruction. Moreover, in the process of refining the heart fire, it cannot be interrupted, otherwise it will also cause irreparable damage, so in this refining process, Long Xingyu can only go all out, and he only has one chance. If you don't succeed, you will be destroyed. This is the so-called coexistence of crisis and opportunity. And Long Xingyu is also very clear about this truth, but wealth is in danger, Long Xingyu is not a short-sighted person, behind this huge danger, the value is very great, which is also worth paying some price, so he decided to take a risk. If you blindly want to improve steadily, then if you lose a self-motivated heart, you will never succeed one day, but can only exist at the lowest level, becoming a pawn in the hands of others. Long Xingyu is not a person who is willing to be cannon fodder at the bottom.

After consulting the cultivation method again, Long Xingyu calmed down, adjusted his breath, and prepared to start refining this "Yuan Shen Heart Fire".

Closing his eyes, Long Xingyu adjusted his essence and energy to the best state, and the energy in the dantian slowly began to operate. Long Xingyu's left hand was on top and his right hand was on the bottom, holding a ball in front of his chest, and Long Xingyu began the process of refining his heart fire according to the cultivation method recorded in the jade slip.

The dark gray energy in the dantian in the body was collected by Long Xingyu in large quantities, and then it ran through the tendons and veins, gathering on the palms of both hands, and then a stream of dark gray energy erupted out, colliding between Long Xingyu's palms, and then the two energies fused with each other, forming the shape of innate Taiji and constantly fused, and a strange and profound energy breath also centered on Long Xingyu, radiating out towards the surroundings. And all the life forms that were touched by this breath also began to quickly wither, and then turned into nothingness. If Long Xingyu opened his eyes to all this, he would inevitably be surprised, at this time, he just released a trace of the breath in the dantian energy, which actually caused such a terrifying situation, so if the dantian qi in his body was completely released, what would happen. However, at this time, he had already concentrated his spiritual power to a high degree, and he did not react to these changes in the outside world at all.

After the energy fused, a dark gray air mass appeared in front of Long Xingyu, but at this time, this air mass was constantly rotating, and at the same time, it was constantly absorbing the energy of the surrounding heaven and earth to grow.

What Long Xingyu did at this time was to refine a hotbed for cultivating the heart fire, after all, after truly refining the heart fire for a while, he needed to transplant it into this hotbed immediately, otherwise it might be extinguished, and Long Xingyu's efforts would be wasted, so he needed to make good preparations at this time.

Nine days later, the energy in Long Xingyu's palms has been completely fused together, becoming a dark gray air mass, during this time, Long Xingyu has been continuously outputting dantian energy, but his dantian energy does not seem to have lost too much, which has to surprise Long Xingyu, but at the same time, it also gives him a little more confidence in successfully refining the heart fire.

A faint gray light shone brightly, and Long Xingyu released a trace of spiritual power at this time, directly integrating into this air mass, and then he cut off his connection with this trace of spiritual power. He snorted, but Long Xingyu didn't care too much, and continued to refine the air mass in his hand.

As time passed, another nine days passed, and a faint milky white light suddenly appeared in the dark gray air mass, and at this moment, Long Xingyu suddenly spit out a mouthful of blood. This effort was also directly integrated into the air mass with a hint of milky white light. However, when this heart's blood was spit out, Long Xingyu's state was a little sluggish, and the whole person seemed to become a little overwhelmed all of a sudden, and the original strong aura was also sharply reduced by three percent. But even so, Long Xingyu at this time had no intention of stopping, and was still trying to control the air mass in his hand and transmit energy to it.

The refining of the Yuan Shen Heart Fire recorded in this jade slip itself was created for the masters of the Distraction Period who had already cultivated the Yuan Shen, but the person who created this exercise in the first place simplified it a lot, and it also made the requirements for refining the Heart Fire much more relaxed. And fortunately, the heaven and earth here are full of spiritual energy, and Long Xingyu's dantian energy can also assimilate the surrounding energy, which has reduced his consumption a lot.

When the air mass in Long Xingyu's hand went through nine days of refining, it finally turned completely milky white, and there was a faint trace of blood flowing in it, and then Long Xingyu's palms changed, and the original up and down momentum suddenly became erect in front of his chest, and at the same time, the air mass also began to compress the process. At this time, Long Xingyu also seemed to be a little unsupportable, his expression was sluggish, and his breath was slightly unstable, but even so, he still insisted.

After another nine days, Long Xingyu finally compressed the air mass to the size of a ping-pong ball, and then Long Xingyu opened his mouth and swallowed the air mass in one bite, and suddenly, Long Xingyu's whole body was shocked, and an extremely unstable aura emanated from his body, and suddenly with his body as the origin, it exploded to the surroundings, and everything within a radius of 100 miles disappeared.

However, as this air mass entered his body, Long Xingyu's original sluggish state also recovered all of a sudden, and even the impact caused by the loss of a mouthful of blood before, it seemed to have made up for it. After Long Xingyu's aura erupted, the aura in the surrounding heaven and earth instantly surged into his body, and the surging aura of heaven and earth directly turned into a huge white light cocoon, enveloping Long Xingyu's whole person, and the power consumed by Long Xingyu before also recovered quickly. Nine days had passed in this stage, and when the white light cocoon disappeared, Long Xingyu also reappeared in this world. However, at this moment, Long Xingyu's aura has improved a lot compared to before, it turns out that inadvertently, he has completely broken through the barrier and reached the innate eightfold level in one fell swoop. But even so, his mental consumption is still very huge, but at this moment, Long Xingyu can't control much, half of the work is done, and the remaining half can be successful, but at this moment, the more he can't let his guard down.

Long Xingyu didn't dare to be sloppy in the slightest, because the more he got to this time, the more likely it was to go wrong, he didn't want to give up his efforts because of an oversight, and Long Xingyu, as a scientist, did not allow himself to make such a mistake. After refining that medium, Long Xingyu began the most difficult part of the road, which was to condense and compress his spiritual power.

The spiritual power converged to the position of Long Xingyu's chest, and then began to materialize, and then gathered into a slightly silver light cluster in the middle dantian, Long Xingyu knew that this was the aggregate of his spiritual power, and he didn't dare to slack off at the moment, and his mind moved, and his spiritual power began to continue to compress and condense the process.