Seeing that Xiao Yi's face kept changing, Wu Peng knew that Xiao Yi must have noticed something unusual. He felt itchy in his heart and asked carefully, "Sect Leader, is there anything wrong?"

Xiao Yi did not answer Wu Peng's question. Instead, he slightly turned around and looked at the high sky behind him. He slightly cupped his hands and said in a clear voice, "Did Dr. Liu arrive?"

Wu Peng was startled and looked around in confusion, but he didn't see anyone at all. He didn't know who Xiao Yi was speaking to.

However, a moment later, Wu Peng was surprised to hear a loud and clear laughter coming from the distance. "Haha, good ears, good eyes, Mr. Xiao."

The voice turned out to be Dr. Liu, the one who competed with Xiao Yi three days ago for the treatment.

As soon as Wu Peng's thoughts turned here, he discovered that on the distant horizon, a beam of green light flashed and suddenly appeared in front of him. Upon closer inspection, he saw that it was actually a broadsword that was two feet wide and ten feet long. The beams of green light on it were shining brightly. It was truly an incredible sight to behold.

On top of this broadsword, there was a person proudly standing on his own. It was the tall and honest Liu Zhen!

"Ah? Flying on a sword? Dr. Liu is also a cultivator?" Wu Peng didn't expect that the mysterious doctor that day was also a practitioner. Moreover, he could fly on a sword, which made him so surprised. Then, his face was filled with boundless envy and admiration from the bottom of his heart.

Liu Zhen was still smiling. He stepped down from the shining flying sword. Then he waved his sleeve and put away the flying sword. He nodded to Wu Peng and came to Xiao Yi's side. He cupped his hands and bowed. He said, "Mr. Xiao, how are you?"

Xiao Yi raised his hand, picked up Liu Zhen, and said with a smile, "Dr. Liu, your cultivation is far above mine. Aren't you doing me a bad favour by doing such a big salute?"

"Hey?" Liu Zhen waved his hand with a smile. "A man of virtue doesn't care about his cultivation. To tell you the truth, I have been paying attention to Mr. Xiao for a long time. Since Mr. Xiao's debut, all people in the country have not only gotten rid of Boxika but also gotten rid of the plague of Aphra. Recently, you even saved thousands of patients crazy with drugs with the Eight Worlds Guiding Skill. All cultivators like us admire your boundless merits. I'm convinced! Although I have slightly higher cultivation, I just rely on the time of cultivation. How can I compare with the speed of Mr. Xiao's cultivation progress every day!"

Since Liu Zhen said so, Xiao Yi knew that Liu Zhen knew him well. Liu Zhen's straightforward words made Xiao Yi feel that he was sincere and honest. Moreover, he was modest and low-key and did not show his high cultivation. Xiao Yi could not help but have a better impression of this person. He smiled and asked, "Dr. Liu, you're too modest. I don't know what kind of sect you are from?"

"I'm from Lao Mountain's sect!" Liu Zhen bluntly replied.

"The Lao Mountain's sect? I don't know if fellow Taoist Huang Zhong is in Doctor Liu's sect?" Xiao Yi naturally remembered Huang Zhong in the Special Operations Group. He was also a member of the Lao Mountain's sect.

"Well, to be honest, Mr. Xiao, Huang Zhong is my junior brother, and the head of the Special Operations Group in Eastern Hua Country!" It was not until this moment that Liu Zhen finally revealed his identity.

"Oh, it's you, Mr. Liu! Please forgive me!" Xiao Yi didn't expect Liu Zhen to have such a status. The Special Operations Group was the most mysterious official organization in Hua Country. It was also unfathomable.

Liu Zhen continued, "Mr. Xiao, I like to travel around. I only recently moved to the vicinity of this Spirit Spring Village. I thought that this place should be a treasured place with feng shui, but I did not know that I had discovered the strangeness of this Spirit Spring Village. I think Mr. Xiao must have noticed something."

"That's right. I didn't expect someone to set up a Chillywind Skull Formation in Spirit Spring Village. It absorbed the Death Qi of the surrounding hundreds of miles and suppressed a great amount of Spiritual Energy. It's truly extremely vicious." Xiao Yi nodded.

Liu Zhen listened to Xiao Yi's words, thought for a moment, and said, "Mr. Xiao, if I say that this kind of Chillywind Skull Formation is not the first one in the country, do you think it is strange, Mr Xiao?"

"What? This kind of Chillywind Skull Formation has actually appeared before?" It was now Xiao Yi's turn to be completely shocked.

"Yes." Liu Zhen nodded. "This is the reason why I invited Mr. Xiao here to Qingshui County. Since last year, the Special Operations Group has received reports from all over the country, and we have discovered at least three Chillywind Skull Formations. Each place is set up in a secret place. Some of them live in such a desolate place where people live, some of them are simply set up in a desolate place without any smoke. The Death Qi collected by the evil cultivators has not been trained by them. I really can't see through the intentions of the formation, so I invited you here."

"Is that so?" This news, for Xiao Yi, was no less than a clap of thunder on the ground. This Chillywind Skull Formation was an evil secret technique. How could it be common? Moreover, Liu Zhen said that there were no evil cultivators practising evil techniques with the Death Qi. So what was the use of the Chillywind Skull Formation to gather the boundless Death Qi?

"Mr. Xiao, if I remember correctly, this Chillywind Skull Formation's maximum effect is gathering the surrounding Death Qi. Was this formation created to cover the Qi of some treasures?" Liu Zhen asked with a frown.

Hearing this, Xiao Yi thought for a while. But he said decisively, "Dr. Liu, would you like to go to the underground spring with me? Let's find out the truth about the Chillywind Skull Formation. As the saying goes, how can one obtain a tiger without entering a tiger's nest? If we want to find out the origin of the Chillywind Skull Formation, we should first break it and see what's going on. What's more, the people in the Spirit Spring Village are suffering from the disturbance of Death Qi."

Liu Zhen was waiting for Xiao Yi's reply. Hearing this, he immediately punched his fist hard and said excitedly, "What a bold man! I knew that Mr. Xiao wouldn't let me down!"

Xiao Yi didn't say much. He led Wu Peng and Liu Zhen down the mountain peak and walked towards a pond not far from the foot of the mountain.

The pond's surface area wasn't large, but it could directly lead to the underground spring of Spirit Spring Village.

Xiao Yi ordered Wu Peng to stay by the side of the pond. Because Wu Peng's cultivation had not yet reached the Qi-refining Realm, he naturally couldn't hold his breath underwater for a long time.

Wu Peng naturally did not dare to disobey Xiao Yi's words. He hurriedly responded and stayed alert at the side of the pond.

As for Xiao Yi and Liu Zhen, they each raised their hands and cast a protective shield of True Energy on themselves. Then, they jumped into the pond.

With the protective shield of True Energy, the two of them dived into the water, as if they were walking on flat ground, towards the source of the spiritual spring.

After diving for about 300 metres, they arrived at the belly of the mountain where the underground spring was located. The belly of the mountain was not big, only about 100 square metres, which was gloomy.

A complete round of Chillywind Skull Formation floated on top of the spring. Wisps of Death Qi continuously seeped out from the mouths of the skeletons and slowly seeped downwards, bringing with it waves of chilly wind. The Death Qi within the formation was so dense that it was impossible for one's Divine Awareness to penetrate it. As such, they would not be able to observe the strangeness of the spirit spring beneath the formation.

"Mr. Xiao, although this Chillywind Skull Formation looks calm on the surface, once it is disturbed, it will be unusually vicious!" Liu Zhen reminded Xiao Yi after a moment of silence.

"That's right! So, before we break the formation, we have to do some other work!" After thinking for a while, Xiao Yi took out 36 Jade Talismans and used the pure Yang blood on the tip of his index finger to draw them.

"Go!" Xiao Yi wrapped the Jade Talismans with his Divine Awareness. The Jade Talismans went straight to their respective positions with a light shout and inserted themselves into the stone gaps around the spiritual spring. A burst of light flashed, and then it disappeared.

"Spirit Seal Formation?" With just one move, Liu Zhen was shocked.

"That's right. If we don't first set up this Spirit Seal Formation, if the Chillywind Skull Formatio gets disturbed, the entire mountain would collapse," Xiao Yi explained.

"Sure enough, Mr. Xiao is thoughtful," Liu Zhen's tone showed more respect for Xiao Yi. Although Liu Zhen's cultivation was much higher than Xiao Yi's, he was far less experienced than Xiao Yi, who had been cultivating for hundreds of years.

With just a wave of his hand, he set up an exquisite formation, which made Liu Zhen admire him.

"Do it, Dr. Liu!" Xiao Yi ignored Liu Zhen's surprise and shouted in a low voice. With a flick of his right wrist, he turned the Snake Bone Whip into the air.

Liu Zhen saw that Xiao Yi had already made his move, so he was not willing to show weakness and immediately released his weapon. It was a divine red fan. With a casual shake, the fan emitted clusters of raging fire, which looked very handsome.

As soon as the Chillywind Skull Formation was violated, waves of unusually dense Death Qi were spat out from the mouths of the 108 skeletons, as if they were solid. A cold and bone-piercing aura instantly spread throughout the entire mountain. A thick layer of ice instantly formed on the pitch-black rock.

Then, a gust of chilly wind burst out, and the dark ghosts with a ferocious look came out of every skeleton. For a time, the ghosts cried and screamed, bared their fangs, brandished their claws, and rushed to the snake bone whip and divine fan.

The whip was made by Xiao Yi from the whole snake bone without any modification. Although it retained the fierceness of the giant snake to the greatest extent, it couldn't resist the gnawing of many Death Qi and ghosts. In a moment, the snake bone whip was covered with black cracks and made a slight cracking sound. It would be destroyed in a single touch.

Xiao Yi felt a great pain in his heart. He hurriedly thought of something and summoned back the snake bone whip.

The 108 ghosts in the formation had gained a lot of advantages with one move, and their ferocity was even stronger. However, it was a good thing that although they were ferocious, their actions could only be restricted within the Chillywind Skull Formation.

However, even so, Xiao Yi was greatly shocked. He did not expect that a large number of ghost souls from the formation had actually appeared within this Chillywind Skull Formation. It was really unexpected.