Sighing, Yu Fei returned to the demon feeding room again, or the steward was there, seeing Yu Fei coming over and looking at it curiously, he moved his lips and wanted to say what he was hesitating about, but he still said: "The above ordered me to seal my mouth, I don't know the result." ”

Yu Fei nodded and entered the demon feeding room, the little person is like this, the first thing that comes to mind is how to save his life, in fact, even if he doesn't say it, Yu Fei will not kill his mouth, he is not this kind of person, and what if it is passed out?

Yu Fei looked around at the demon feeding room, there was nothing special here, it was a large confined space, which was full of demonic energy, purple and black, but also pure, at a glance, there was no end in sight.

According to the hint, Yu Fei came to the area assigned to him, and everyone who came in had a fixed area, and they couldn't move around at will, otherwise it would be such a big place, it would be easy to affect others, especially some of the monsters that were raised, and if they ran around, it was easy for people who were doing business to suck the demonic energy or be demonized.

Yu Fei found a place within his range and sat down, adjusted his breathing, and began to use the Demon Transformation Skill to refine the Demon Qi into his body.

At the beginning, Yu Fei felt discomfort, and there was a trace of pain, with the continuous refining of demonic energy, this discomfort and irritability became more and more obvious, and the pain became more and more intense, which made Yu Fei frown.

According to the "Demon Transformation Secret Scroll", this is the demonic energy rejecting this body full of spiritual power, it doesn't like the environment of this body, but it is domineering, since it doesn't like it, the demonic energy will not choose to quit, but choose to transform, demonize this body, and turn it into an environment it likes, so it will conflict with the spiritual power in the body, because it will feel discomfort and pain when refining.

There is no way to avoid this at the beginning, you can only endure it, let the demon qi circulate in the meridians of the whole body, and finally reach the dantian, where the demon qi and the aura will start to fight, the aura feels that the dantian is its own territory, and the demon qi is absolutely not allowed to invade, so when the demon qi reaches here, it will be the most painful time for the body, but as long as it is carried over, the aura and the demon qi find that they can't help each other, and they will begin to compromise, and then they can use the exercises to coordinate the two, so that the aura and the demon qi can coexist in harmony, and even transform and supplement each other.

However, some gods and demons are not perfect, and the aura and demonic energy in the body are not perfectly integrated, so there are many monks who cultivate gods and demons in the later stage, and they can only vent and roar to vent their pain, which also causes misunderstanding in the outside world, thinking that monks who cultivate gods and demons are easy to go crazy, and are irritable and murderous.

At this time, Yu Fei's back began to ooze cold sweat, which is the result of hard resistance to pain, the demonic energy has gone through the meridians all over the body, and the aura in the body has also discovered this old enemy, and is trying to expel it, both sides seem to be fighting, and the place of battle is the meridians of the whole body, so even if Yu Fei is quite experienced in hard resistance to pain, his back is sweating.

It stands to reason that after a normal monk is infected by demonic energy, he will immediately have a violent conflict with the spiritual energy in his body, causing intense pain, so in the eyes of outsiders, people infected by demonic energy will grab their heads and roar, and roll on the ground, as if they have fallen into an evil spirit, but in fact, it is the spiritual energy that expels the demonic energy, and if the spiritual energy successfully expells the demonic energy, then he will return to normal, which is what we call the restoration of clarity.

If the aura in the person's body is very weak, such as an ordinary person, or the spiritual power is not weak, but the demonic energy that is absorbed is very strong, then the demonic energy will expel the aura to occupy the body, which is what we call demonization.

Yu Fei felt like he had experienced a few days and nights, the demonic energy had finally arrived in the dantian, and he was about to start the ultimate showdown with the aura, and he couldn't help but swallow a mouthful of saliva, hoping that everything would go according to plan, as the "Demon Transformation Secret Scroll" said, don't make a mess, I don't have a master, and now the academy doesn't care, if there are three long and two short, it will really be explained here.

However, it backfired, and the demonic qi was attracted by the dark energy the moment it entered the dantian, and it was swallowed in an instant.

Yu Fei's whole person was stunned, what was the situation? I didn't let you devour it, what else did I turn if you devoured it? How can I accumulate experience, I rely on it, it's not under control!

Yu Fei scolded the street in his heart, the demonic energy entered the dantian and immediately lost control, and was directly absorbed by the dark energy ball, it was like a black hole, greedily devouring the demonic energy, and Yu Fei also found that during this period, the dark energy became more.

Seeing that the demonic energy was constantly inhaled and transformed into dark energy, Yu Fei wanted to cut off the demonic attack several times and no longer absorb the demonic energy, but he held back, he wanted to see what would happen, this is an extremely bold idea, but it is human nature, who doesn't expect a miracle to happen?

Since the formation of the dark energy sphere, there has never been a movement, this is the first time there has been a move, although it is very strange why he didn't devour all the aura in the dantian, but chose the demon qi that he just entered, maybe it is because he has reached some kind of harmonious symbiosis with the aura, just like after the double cultivation of gods and demons, the demonic aura transforms each other but does not harass each other.

Then this is a double cultivation of spirit and darkness, but I don't see what the use of this darkness is~

Oh no, it's still useful, don't worry about yourself being demonized in the future... I don't know if that's a benefit.

On the other hand, the current dark energy is far less than the spiritual power, if you want to double cultivate the spirit and dark, the two energies need to be as equal as possible, so that they will coexist harmoniously, otherwise one strong and one weak is not called symbiosis, at most it is called dependence, and it cannot be regarded as double cultivation.

And this also involves another problem, that is, the spiritual power storage problem of the dantian, the size of the dantian is limited, the storage of spiritual energy during the qi training period is aura, the aura continues to increase, and the cultivation is constantly improving, after reaching the limit value, the aura begins to compress the liquid, and after all the liquid, the cultivation is promoted from the qi refining period to the foundation building period, and the density of the liquefied spiritual energy increases and the volume decreases, so the dantian has space to continue to store spiritual power.

And when the liquefied spiritual power continues to increase, it will reach a critical point, and if you want to further improve, you can only condense into a pill, that is, a knot.

In addition to this method, there is also a side door, which can also appropriately increase the spiritual power reserve of the dantian, that is, to expand the dantian, in fact, this is not a secret, and the children of the big races and big forces will try their best to expand the dantian, so that their spiritual power is more than that of the monks of the same level, and the victory rate is higher.

However, this method is limited by the physical body, and it can be improved very little, basically one-tenth is the limit, and if it continues to expand, the dantian will be damaged, as if a balloon has been blown up. Of course, there are always individual freaks in the universe who can break through the one-tenth limit.

And Yu Fei is obviously not, but he has also reached the limit of what can be expanded during the foundation building period, that is, one-tenth, of course, this is not Yu Fei's ability, but thanks to the help of the giant supernova Aaron, with the help of the existence of this famous universe, it is naturally not a big problem to expand to one-tenth of the limit.

Now Yu Fei is facing the problem of the limit of the dantian, it is already about to reach the limit value, the dantian can no longer reserve more spiritual power, the initial plan is to introduce demonic energy, and after the two have passed the initial stage peacefully, then the spiritual power will be converted into magic power through the magic power, familiar with this set of processes, and finally try to transform the dark energy, so that it will not reach the limit value of the dantian.

But now that the demonic energy is pouring in, it will be swallowed by the dark energy, and it can't even be stopped, so this plan will naturally die abruptly, and it will end before it has even begun.

But if it's really just the end, it's a big deal to think of other ways, but now the dark energy is increasing, and the spiritual power is not decreasing, the dantian can't hold on, if the dark ability continues to increase, the dantian may be broken; if it stops, the dark ability can't be equal to the spiritual power, and it won't be able to cultivate the spirit and darkness.

Things have reached a dead end~

The arrow has to be sent on the string, the dantian is no way to expand, there is no powerful protector, there is no corresponding pill, try it yourself is to joke with your life, the only thing you can do is to compress the spiritual power as much as possible, but you can't go to the Dan, the best place to get the Dan is not here, but the Danyuan secret realm full of spiritual power.

And the demonization function in the "Demon Transformation Secret Volume" converts spiritual power into magic power, so you must also try to convert spiritual power into dark energy, it stands to reason that dark energy can also devour spiritual power, it should be simpler, and this is the only way out at present, because Yu Fei found that the transformation of dark energy and demonic energy is not equal, not only the quality is not equal, but the volume is not equal.

If it is 4 cubic meters of demonic energy with a mass of 4, after being swallowed by dark energy, there is probably only 1 cubic meter left, and the demonic qi with a mass of 2 is lost during this period, and the density of dark energy is greater, so the volume is smaller, so that the same volume of dark energy is more than the same volume of demonic energy and spiritual energy.

Therefore, when I first encountered the Void Clan, it was not a pity that the dark energy of the people was sprayed, because the energy of the reservoir in the people's bodies was almost twice that of the New Universe Cultivator.

And Yu Fei also understands a truth, it is not that the larger the volume, the greater the mass, for example, neutron stars are tens of thousands of times smaller than ordinary stars, but the mass is several times that of stars, because neutron stars are denser.

His own dark energy ball is obviously very similar, the same volume can store more energy, if you can convert part of the spiritual power in the dantian into dark energy, then you will free up more space, you can absorb more spiritual energy into the body, and your spiritual power value will also exceed that of other monks, it will last longer during battle, and the spell will be cast more freely.

Yu Fei sighed secretly, and he was going to play with his life again~

But the dantian has reached a critical point, and the dark energy is much worse than the spiritual power, and it is impossible to cultivate the spirit and darkness at all, and there is no other way than to try bravely.

Thinking of this, Yu Fei abandoned distracting thoughts and began to operate the Demon Transformation Skill, but instead of absorbing the Demon Qi into the body from the outside world, he tried to mobilize the spiritual power and dark energy in the dantian together, and rotated around the meridians according to the meridian route mentioned by the Demon Transformation Skill, guiding the dark energy and spiritual power to blend and transform each other.

The spiritual power is very simple, and the mind is mobilized as soon as it moves, but the dark energy is like an arrogant person, and it is not moving if it is driven by Yu Fei.

Forcing Yu Fei to be anxious, if you don't move, Lao Tzu may die, and I will knock you to death before I die!

Use the magic transformation skill to drive the dark energy over and over again, in the end, you are also a kind of energy, and you can also devour and transform spiritual power, I really don't believe it, the exercises can't be urged!

An hour has passed in the blink of an eye, Yu Fei has tried to drive dark energy more than a thousand times, but there is still no response, Yu Fei has to wonder, whether it works or not, even if it is fast ice, it has been warmed by me, aren't you moved?

However, Yu Fei is not a person who gives up easily, if he can't do it a thousand times, then ten thousand times!

Determined to calm down again, Yu Fei tried to drive the dark energy over and over again.

A day passed in a blink of an eye, Yu Fei finally smiled, and after nearly 30,000 drives, finally... It's your own.

The man who was abandoned by the god of luck failed again as expected...