At this moment, the two of them could already be sure that even if Yun Yu was not a member of the Assassin Alliance, he must have killed the assassin, because the terrifying attack aura they sensed at the beginning was the attack method that only the assassin of the Assassin Alliance could have.

Because the old man surnamed Feng once existed in a secret place, he saw with his own eyes that an assassin of the Assassin Alliance had killed a peak monk of the Spirit Realm.

The aura of that gray arrow sword, even though he was miles away from the place of battle, he still felt a strong threat approaching.

That terrifying feeling, he naturally remembered it deeply, and that feeling, although it was far less intense than when Yun Yu sacrificed the Qingmang Arrow Sword, but the breath feeling was the same.

Watching the two old men go away, Yun Yu turned around and looked at the dark hole in the distance, and his expression suddenly showed solemnity.

He wants to find out what is true, but he will not blindly move forward unprepared.

He didn't know what existed in the depths of the depths, but he knew that since there was no record of the depths of this place in the scriptures, it was enough to show that very few monks had penetrated into the depths before, which was enough to show that there was a dangerous realm in the depths of this place.

Knowing that there might be danger, Yun Yu still didn't give up thinking about going deeper.

The essence in his eyes flickered, and his expression showed a resolute color, and he launched several treasures to prepare completely, and his body moved, and he ...... towards the depths of the cold cave.

This time they entered the bottom of the Yin Wind Stream, and in addition to collecting ten Yin Wind Flower Spirit Grasses, the three of them also found a lot of other Yin Attribute Energy Hidden Spiritual Grasses that were difficult to see.

Those spirit grasses, among them, are nearly 100,000 years old spirit creatures.

For this level of spiritual grass, Yun Yu did not greed for ink alone, but directly divided it equally with the two old men, that is, it could not be separated, and Yun Yu did not collect it alone, but exchanged it for the same value to the two.

It is true that the two old men offended him in the first place, but this time they ventured into this dangerous place to help each other, which can be regarded as atonement. Since it is a treasure found by the three of them, it makes sense to divide it evenly.

That is, Yun Yu's selfless behavior made the two old men very grateful, and the negative emotions in their hearts were somewhat resolved.

For Yun Yu, of course, it is impossible to cultivate two old men into loyal subordinates or something.

But he didn't mind taking advantage of the two, so he gave the two some sweetness and gave them hope. With these, the two old men knew that they were being used, so they could only actively cooperate.

The reason why Yun Yu wanted to venture deep into this place was that in addition to being interested in the place where the bursts of shouts came out and wanting to see what the place where the Yin Wind Energy was born, there was also one main thing, that is, to find the Soul Yuan Dan.

Because of this naturally occurring topography, it is possible to give birth to the possibility of such a rarity. Since he had time, he naturally didn't mind looking for it in this place where no one went deep.

Unhurriedly, Yun Yu began to slowly search in the pitch-black hole path of this yin wind energy.

In such a situation, the mere darkness and howling winds around him were enough to make a mentally unstable person break down.

Of course, if you practice in such an environment all year round, it will have many benefits for the monk's mental strength and body.

But the premise is that the monk must be able to withstand the terrifying environment here, and after walking through the cave paths, even Yun Yu can't help but feel a little dizzy.

There are no rules for these passages, they are all zigzags, if Yun Yu entered this place when he was in the Solid Spirit Realm, he would inevitably be lost in this place with his mental realm at that time.

But after cultivating to the realm, his memory ability also surged, and in this labyrinth-like underground passage, Yun Yu did not have a sense of disorientation at all, nor did he misidentify a path.

Staying in this underground labyrinthine passage is more than ten days. The place where he was at this time, judging by Yun Yu, might have entered tens of thousands of zhang deep underground.

The yin wind roared wildly, and the sharp blade carried in it was even more powerful.

In the face of the intense cold that could almost freeze the soul, as well as the sharp wind blade attack that could open mountains and split stones, Yun Yu no longer had the calmness he had before at this time.

Just relying on the natural protection of the aura of fire energy was no longer enough to resist the sharp and cold wind blade in the yin wind.

The terrifying and cold aura of the Frozen Divine Soul had to allow him to run the fire energy to the surface of his body.

With the defensive wall of the Cloud Sky Cover inspired by Yun Yu, those powerful wind blades that could kill ordinary spiritual cultivators were finally free of the slightest threat.

With the dual protection of the Cloud Sky Cover Body Cultivation Method to form a defense and a fire energy protector, the danger that appears around is naturally greatly reduced.

As we went deeper, the sound of the call in the yin wind became clearer and became deafening.

Based on Yun Yu's inference, it should be the sound of a strong wind blowing rapidly from a small place to the passage of the road.

This is even more certain of what Yun Yu had previously predicted, the place where the Yin Wind was born should be a Yin Wind Cave Land.

In the entire spiritual world, there are some dangerous places, and at the same time, there will be great opportunities.

Yun Yu has confirmed this many times, and every time he enters a dangerous place that no one dares to enter, he can get some tangible benefits more or less.

If he hadn't had those personal experiences, he would still be struggling in the realm of the Solid Spirit Realm at this time.

It was precisely because he went deep into some dangerous places every time he explored, and under that kind of dangerous situation of nine deaths and one life, he was able to obtain the opportunity to defy the sky, and his cultivation and realm increased greatly.

At this time, the area of the main passage has reached a range of hundreds of zhang, and even those forks in the road are already wider than the main passage at the earliest time.

Yun Yu's face was gloomy, his eyes flickered, and he gritted his teeth secretly, but he still didn't stay, and continued to run towards the cave in front of him.

After marching for two hours again, Yun Yu suddenly stopped on the spot. At this time, Yun Yu's gaze became extremely cold.

The fire energy cover wall is even more difficult to be stimulated by him. His youthful face looks even more hideous at the moment.

The violent cold hurricane howled in front of him, and a huge roar that he had to completely block his auditory senses filled the tunnel.

Just listening to these howls was enough to make the minds of ordinary Spirit Realm cultivators roar, and they instantly felt faint.

The power of the yin wind in the cave has reached an extremely terrifying level at this moment, even if Yun Yu excites his own cloud sky cover wall with all his strength, he can't stop shaking his body.

And the Dao Ice Crystal Wind Blade contained in the Violent Yin Wind reached the attack strength of a late-stage spiritual realm cultivator.

The powerful wind blades that only the late-stage cultivators of the Spiritual Realm had countless Dao continued to slash, and even if it was a Mysterious Spirit Realm cultivator, his complexion would definitely change suddenly.

The icy aura that raged around Yun Yu's body was even more extremely cold, even if he was a fire attribute cultivator, under such a cold aura, it was difficult to say whether he could hold on for an hour.

In such a harsh environment, even if he is not killed by the cold and wind blades, he is bound to die in it because of the exhaustion of his spiritual power.

The place where it falls, even the soul thoughts in the brain domain, are bound to fall into it, and it is difficult to escape. When he arrived at such a place, Yun Yu couldn't help but feel a sense of distraction in his heart.

Although he felt that he was close to the place where the howl came from, the situation in front of him was also an extremely powerful threat to him.

If it weren't for the dual protection of the Secret Fire Energy Cover and the Cloud Sky Cover Wall, he was not sure if he could hold out for more than ten days in such a place just by relying on his spiritual power mangsha.

If he had come in his prime, he would have moved on and would not let go until he had reached his goal. But before his soul wounds healed, he really felt a great crisis coming.

Just when Yun Yu made up his mind and planned to return here, suddenly, a breath that shook his heart suddenly appeared.

Although this aura was not strong, it contained a strange energy that made his soul excited.

With just a slight feeling, he felt a powerful strange divine soul energy being instantly absorbed by his soul thoughts.

This strange aura appeared extremely quickly, and when Yun Yu's spirit was shocked, and his mind was about to carefully identify it, that aura disappeared without a trace.

If it weren't for Yun Yu's conviction that that strange aura had really appeared, he would definitely think that it was just an illusion just now.

Sensing the benefits of this strange aura to the Divine Soul Thoughts, he had just decided to go away, and he was immediately shaken again.

Although there are a few strange cherished spiritual objects in the spirit world that can nourish the soul of the divine soul, those cherished things can only nourish the divine soul, and it is absolutely difficult to be as visible as just now, and with just a faint breath, the divine soul in his body can have such a strong feeling.

It seems that that strange aura is a kind of divine soul origin. It seems that as long as it can be absorbed into the divine soul, it is enough for the divine soul to grow and break through the realm.

Such a treasure is in front of him, Yun Yu has never encountered it, nor has he consulted it from the classics. But this situation did appear in front of him just now.

Without the slightest pretense, that strange aura was indeed not hindered by any of his defensive powers, and directly invaded his sea of consciousness and merged into his divine soul and soul thoughts.

Standing on the spot, the resolute look in Yun Yu's eyes slowly revealed, the green tendons on his neck burst out, and an extremely terrifying fierce aura suddenly gushed out from Yun Yu's body.

With a single move, he walked again towards the depths of the dark cavern.

Although his steps are no longer rapid this time, every step he takes is extremely firm, as if there is a spirit above his body that can break through any obstacles and move forward bravely.

Swept by the terrifying icy wind, his body that had been shaking before was no longer shaking at this moment.

The sound of the call sign was very loud, and when it arrived here, it seemed that its voice had already contained sound wave energy, so that Yun Yu was running the soul liquid guard with all his strength, and he could no longer easily resist the huge call sound.

But the strong belief in his heart supported Yun Yu to bear it strongly, and he still walked forward firmly.