After nearly a year of full cultivation, Yun Yu's Illusion True Body Technique could be regarded as having entered the first stage of stability.

And under his perceptual research for nearly a year, the pure yin energy that was infused into his body made him have some strange palpitations.

But this kind of inexplicable palpitation induction, Yun Yu only knew a little bit that it would be beneficial to his cultivation acceleration in the future, but it was very ethereal, and he didn't know the details.

Although a large amount of Yin Qi energy was absorbed, so that the Illusion Demon True Body Technique was stable in the first stage of the exercise, there was still a lot of difference in converting all its energy into Yin attribute energy and upgrading its own ghost spirit transformation technique to a small level.

The exercises are naturally different from the exercises, the Illusion True Body Technique is mainly aimed at the secret arts and the strength and development potential of the body, while the Ghost Transformation Technique also has such an effect, but its main response is cultivation.

Yun Yu originally thought that the Yin Qi energy here was so pure, and the amount was frantically infused into the body in the past year, which should enable his cultivation to be promoted to the middle level, but it was still insufficient.

Therefore, Yun Yu seemed a little disappointed, but when he thought about it, he was worried that there would be a period of weakness after sacrificing the true body of the illusion, but at this time, there was no such concern.

Concentrating on the place where the original yin energy gushed in the distance, Yun Yu's eyes flickered with a void aura. After a moment, his hand was raised, and the mantra was recited in his mouth, and the yin energy around his body turned into a liquid substance that suddenly rose.

Under the guidance of the magic trick in Yun Yu's hand, all the surrounding energy was quickly condensed together, and suddenly a ball of condensed ball energy about the size of a skull appeared in front of him.

The majestic energy contained in this group of yin energy condensed into a group would have gasped if it had been seen and sensed by a powerful monk at this time.

"Go!" A thought came out, and the round ball that condensed the surrounding yin energy in his hand suddenly shot towards the land of the Yin Spring that was so dense that it could not be detected by the senses hundreds of zhang away.

"Huh...... Boom!" A huge roar of energy collision sounded, dazzling red light and gray-black mist shone up, and an extremely strong wind suddenly swept around.

Looking at the core of the Yin Spring that had been attacked by the energy in front of him, the majestic Yin Qi energy that Yun Yu was looking forward to did not gush out again.

Standing on the spot for a moment, the blue light in Yun Yu's eyes retreated, and together, he removed the formation and the shield of the Xuan Tortoise Shell around him, and in a flash, he quickly flew away in one direction.

The attack he launched just now was not much different from the attack that the old man had launched to break the Yin Spring using secret techniques.

With such a powerful attack, it was not able to disperse the dense and liquid mist, and with Yun Yu's knowledge, he naturally knew that the reason why the old man was able to easily attack it was because he was familiar with the natural prohibition of this Yin Spring Land, and he had found a certain degree of tricks.

It was precisely because of this realization that the old man would lead himself here, wanting to use that majestic Yin Qi energy to infuse his body or urge it to explode to destroy himself.

Since it was impossible to bombard an incision again and spew out Yin Qi energy, Yun Yu would not stay. Together, they went directly in the direction of the flow of yin qi.

This place at the core of the Yin Spring is known as the place where the Yin Soul Spirit was born in the Demon Soul Secret Domain, but Yun Yu has been here for nearly a year, and has received Yin Qi energy infusion at the core, but he has never seen the existence of a spirit, which is really a bit suspicious.

But this puzzle is not what Yun Yu wants to know the most at this time.

In this core place of Yin Spring, his most urgent thing is naturally to take his cultivation to a higher level, and the ultimate goal is to find a way out of the lost land or to leave.

Although the yin energy in this place is still very thick, it is a little thicker than the Jedi and forbidden places where the yin energy is more abundant in the original cultivation world, and it has a great effect on Yun Yu's internal skills.

Although he had experienced the purest Yin Qi energy infusion for nearly a year, Yun Yu had his own feeling that in such a situation, as long as there was one more majestic Yin Qi energy infusion, he might be promoted to a small level of cultivation.

But the goal could not be achieved, in this regard, Yun Yu was not too disappointed, it was already a great opportunity to be able to refine such a majestic Yin Qi energy here without any distractions, so that his Illusion True Body Technique could be completely stabilized and pass through the period of weakness.

The reason why Yun Yu flew away in the direction of the flow of yin qi in this place was not to rush to leave this place, but to explore the secrets of this place and see if there were any new discoveries.

There was more thick yin fog in the sky at the core of this place, but the direction of the flow of yin energy inside was still quickly distinguished.

Yun Yu found out the direction of the flow, and could naturally judge where the yin qi was gushing, and its bodies flew away in one direction without stopping.

The more he flew forward, the more Yun Yu felt that the Yin attribute energy aura around his body became thicker and thicker, and the feeling of longing in his body became more and more obvious.

At this time, Yun Yu knew that in this area, not only the Yin Spring that the old man led him over was the Yin Spring rumored by the Demon Souls, but there was also another Yin Spring Eye.

The reason why the old man led Yun Yu's past Yin Spring Eye was different in terms of Yin Qi energy characteristics and that there was no essence existed could only be one reason.

The Yin Spring of Red Mist, its Yin Qi energy is suitable for the old man's practice attributes, and that Yin Spring is the old man's secret retreat or only he can possess.

Sensing that he had judged the outline of this place, Yun Yu was also slightly happy in his heart. Therefore, he also accelerated the speed of the light, and came towards the place where there was a subconscious in his body that was interested in the energy of the Yin Spring Land.

At the same time, Yun Yu was constantly thinking in his heart, and he also felt a little suspicious, the monks of the Demon Soul Secret Domain could be said to be terrified of the terrifying Yin Qi energy infused body in the core of the Yin Spring in this place.

Regarding this point, Yun Yu was unexpected, the majestic yin energy automatically poured into the body, if the meridians in the body were unbearable, it would definitely be broken, and in serious cases, it would not be an exaggeration to burst the body and fall on the spot.

However, the Yin Qi energy in this place can be refined and transformed into Yin attribute energy, while the Demon Soul Cultivators are very displeased with the Yin attribute energy, which is a bit incomprehensible.

Could it be that the Demon Soul or Yin Soul is not a spirit or spirit of the same kind as the Ghost Soul, or is there something great secret or different heaven and earth rules in this Demon Soul Secret Domain?

Yun Yu was also thinking about it in his heart, but he couldn't figure it out. As long as you put it down first, when there is a certain extent, you will have the possibility of understanding.

Tens of thousands of miles later, the yin energy in the sky almost turned into an area where fine mistlets dropped, appearing more than a thousand miles in front of Yun Yu.

Sensing the thickness of the yin energy in front of him, Yun Yu's heart suddenly shook, such a majestic yin energy was thicker than the yin energy that was spewed out by the old man before.

And this yin energy is gray and black, and he knows that the place ahead is where the real yin fountain gushing out is rumored by the demon souls.

Stopping and hanging, Yun Yu's soul power probe was released with all his might, and he carefully scanned the place in the distance, and his expression couldn't help but be solemn.

In this existence that all demon souls feared, he naturally would not take it lightly. After staying in the local area for half an hour, Yun Yu slowly marched towards the front.

Yun Yu, who was flying away, suddenly felt a suffocating sensation approaching him, as if the majestic yin energy around his body was surging into his body, and it had already wrapped and sealed his figure.

Sensing such a feeling of wanting to imprison him on the spot, Yun Yu stopped moving forward again and hovered on the spot.

Here, there are still four or five hundred miles away from the real Yin Spring gushing place, and it is the extremely low howl in the air in the distance, although there are extremely large numbers, it is only faintly audible.

But at this time, he sensed the appearance of an extremely strong imprisoning rule force, so it can be judged that the existence of the rules in this place is far greater than that of the Yin Spring Land that the old man guided to.

With this kind of prediction, Yun Yu didn't dare to move forward anymore. But although he is cautious, he has reached the point where he can't help himself at this time.

Suspended in the air, the muscles on Yun Yu's face stiffened, indicating that he was suffering from some kind of unbearable torment at this time.

At this time, although there was still a big gap between the free yin energy around and the place where the yin qi gushed in front of him, it was also much thicker than the yin spring that the old man had attracted before.

Moreover, the yin energy here contains a variety of special substances, among which there is an extremely brutal energy breath, which makes the yin energy with a high degree of purity extremely difficult to refine.

Under the effect of this brutal energy contained in it, Yun Yu suddenly felt that at this time, not only did he have the confinement power around his body that was stranded on the spot, but also seemed to have the intention of converging all the energy yin qi on the spot and infusing it into his body.

Although it had not converged into an energy vortex and appeared around him, the Yin Qi energy that poured into his body at this time was several times more majestic than the previous time.

And as soon as the brutal special energy entered the body, after entering the body, there was a powerful and extremely tearing sensation on the meridian acupoints, and it seemed to be scurrying and impacting in the meridian acupoints.

If it weren't for Yun Yu's timely sense of the existence of a supreme rule force here, he would immediately stop on the spot and hang on the spot to run the exercises with all his might.

At this time, he may have been forcibly dragged to the core of the Yin Spring, and a large amount of Yin Qi energy is surging wildly, even if he is the body of a demon body, and a variety of exercises are practiced, it is difficult to say that he can dissolve this wave of multiple special energies entering the body.

By this time, Yun Yu had finally understood why the Demon Soul Cultivators of the Demon Soul Secret Domain were so afraid of the Yin Spring Land here, and the many violent special energies in it were really not something that ordinary monks could resist.

If he was replaced by a powerful cultivator, even if he reached the late stage of the powerful realm, standing at the place where he stopped at this time, he would not be able to guarantee a long stagnation.

After opening his eyes and scanning the surrounding area, Yun Yu showed a hesitant look on his face, and then looked at the place where the Yin Spring gushed in the distance.

After looking at it for a while, Yun Yu's face was solemn, and he waved his hand, arranged the shield and formation, and sat cross-legged on the stone ground.