It wasn't over yet. When the humming sound coming from the hole and the roar like that of an ancient bull combined together, Bai Yunfei couldn't hold back the blood in his mouth any longer and it spurted out directly.

His face turned a little pale.

It wasn't just him. The same happened to the thirty or so people who came in at the same time. Those people's physical fitness was far inferior to his. In just one move, except for him, almost all of them fell to the ground, bleeding from all seven orifices.

Bai Yunfei calmed himself down and suppressed his restlessness.

The sound lasted less than a breath before disappearing completely.

The mental power spread out quickly, with a hint of fear in it.

Of the thirty or so people, more than ten died and the rest were seriously injured.

It was not an external injury, but an internal injury. The heart and lungs were all severely damaged.

It was simply too horrifying. Just because of this sound, more than ten people died.

I felt a sense of terror and was somewhat afraid to move forward.

This is just the outer periphery. If you really get inside, how terrifying it would be? Just thinking about it makes me shiver all over.

This was the first time Bai Yunfei encountered such a terrifying thing.

Although there is no danger at all on the surface, it is several times more terrifying than having ferocious beasts everywhere.

Recalling the moment when I was injured, I found that I heard the sound first, and then my body was impacted.

I have an idea in mind, but I still need to test it out.

Pass these people and continue moving inside, but keep a constant speed and try not to make any noise.

The holes in the wall stretched out everywhere.

After walking for nearly ten miles, they found a gap. Bai Yunfei followed the gap and felt like he reached the second level.

This time, there were densely packed holes on the stone walls on both sides, and holes one foot in size could be seen everywhere.

However, not far away, Bai Yunfei saw a warrior.

This person is a woman, but she is not young, looking to be in her thirties or forties.

But she has a graceful and exquisite figure, and is indeed a beauty.

The woman seemed to be crawling, moving forward step by step.

Seeing this, Bai Yunfei was speechless. He sped up a little and got closer to the woman.

The woman sensed someone coming, stopped, and turned to look over.

Bai Yunfei's eyes lit up. Although this girl was a little older, she had a beautiful face and a charming look between her eyebrows.

The woman looked at Bai Yunfei, frowned, and raised her index finger to her lips.

Bai Yunfei nodded, ignored her, and walked straight past her.

When the woman saw Bai Yunfei moving so fast, there was anxiety in her eyes, but she didn't say anything and looked terrified.

After Bai Yun flew over the woman, he used his mental power to clearly scan her expression and there was a look of doubt in her eyes.

Although his speed was much faster than the woman's at this moment, it was just the normal walking speed of a warrior, taking three feet per step and trying to keep the noise as low as possible.

However, when he was dozens of feet away from the woman, the hole next to him suddenly erupted like a volcano, and countless screams came out of it.

The roar coming from the one-foot-wide hole was even more shocking.

Bai Yunfei's face turned pale, because the sound this time was several times louder than the previous one.

When a crisis comes, if it is not handled properly, it is very likely to cause extremely serious harm.

The moment he heard the sound, the internal force in his dantian rapidly erupted, and a spirituality was drawn out from it, spreading throughout his body.

Suddenly, Bai Yunfei's body seemed translucent, flickering, somewhat like a candle flame in the middle of the night, swaying in the wind, becoming somewhat unreal.

The invisible sound wave was like a steel knife, slashing at his body.

But at this moment, because of the transformation between reality and illusion, that wave of strange attacks completely missed.

It actually penetrated his body and shot straight through.

Bai Yunfei only held on for one breath before he stopped using his spiritual body technique.

This is the result that Bai Yunfei has achieved in practicing spiritual body techniques in recent times.

Of course, it is still a long way from being a real spirit, but even so, it is still possible to avoid some fatal injuries.

This is the spiritual body technique. For the time being, Bai Yunfei only saw the power of this martial art.

There is no wrong version in the 1619 book forum!

It's simply a cheating ability. If it can be fully mastered in the future, it will have some special effects. Bai Yunfei has great expectations for it.

The sound then disappeared, and Bai Yunfei returned to normal and continued to move forward.

The woman behind him had been prepared and was still far away, so she was not greatly affected. However, she also had blood at the corner of her mouth at this moment, and stared at Bai Yunfei who was going away with a look of shock.

Bai Yunfei felt a little proud in his heart. It seemed that practicing this spiritual body technique really brought unexpected surprises! He began to increase his speed a little and continued to move forward along the curved stone wall.

Along the way, they met three warriors again, all of whom wanted to go deeper.

Seeing Bai Yunfei's casual attitude, these people were extremely angry.

In this Echo Valley, everyone is actually a whole. If one party causes a sonic boom at will, then almost everyone will bear the consequences together. This is the most terrifying thing.

After passing the three people, Bai Yunfei finally reached the second gap.

This might be the so-called third level! After thinking about this, Bai Yunfei felt proud.

The first time you enter it, you can reach the third level, which is absolutely not something that ordinary people can reach.

But when he looked at it again after twisting his body, he was extremely shocked.

The passage is five meters wide, with numerous holes and large cave entrances on the stone walls on both sides.

The key point is that the bluestone under your feet is actually covered with densely packed holes, and bursts of eerie air emanate from them.

Bai Yunfei looked forward and saw a young man in white feathered clothes walking slowly forward.

The speed is much higher than that of the woman.

Bai Yunfei stepped forward and chased after the man.

Perhaps because the noise was too loud, the man turned around to look, but his face was pale. Before he could signal, Bai Yunfei had already strode forward.

The two were about thirty feet apart.

When Bai Yunfei saw the man's expression and thought about the woman's look, he immediately realized that he must have been a little reckless.

But just after I thought of this, changes occurred again.

There was a loud rumbling sound under my feet and on the walls on both sides, like a bolt from the blue.

Bai Yunfei's face also changed, and he quickly used the spiritual body technique to make his body between reality and illusion.