If Li Changqing really followed the clues given by Nadutong, even if Kaifeng City was turned upside down, he would not be able to find any trace of Huang Yulang!

However, Skynet is magnificent and sparse, and there are always various inextricable links in the world.

There is a famous theory of 'six degrees of division', through six people, we can know people all over the world.

To give a very simple example, an ordinary old man in a mountain village has seen the biggest person in his life is the village secretary, but the village secretary knows the township secretary, the township secretary knows the county secretary, the county secretary knows the city secretary, the city secretary knows the provincial secretary, and the provincial secretary knows the national general secretary.

Through the village secretary, the township secretary, the county secretary, the city secretary, and the provincial secretary, after turning the five relationship buttons, an ordinary old man in a mountain village can be connected with the general secretary of the country.

Li Changqing happened to meet the proprietress with a little dead air at the train station, and he wanted to eradicate some evil spirits, but the innkeeper was associated with Huang Yulang.

After the two came to Yingtian Academy, they met Huang Yulang in the academy's cafeteria.

Back then, Huang Yulang attacked Qin Yuanlong, causing the Yin Yang Venerable Qin Yuanlong to disappear, and later did several major things that people and gods were angry about, which not only made Huang Yulang famous in the Yin and Yang Feng Shui, but also had a high reputation in the entire Fangshi Inhuman World.

Who would have thought that such a person would hide in Yingtian Academy as a cook?

Li Changqing was afraid of arousing Huang Yulang's vigilance, so he didn't use his divine sense to probe the situation in the academy, so he didn't know what the two of them said to Huang Yulang in the academy.

But it didn't take long for Huang Yulang to get into the car of the two people and return to Kaifeng City from the highway.

After Li Changqing and the others left, they personally entered Yingtian Academy to investigate.

Most of the academies are in the mountains and forests, but Yingtian Academy is in the middle of the city, Yan Shu, Fan Zhongyan and others have joined Yingtian Academy, and among the four major academies in China, it is also the only academy that has been upgraded to Guozijian.

However, Yingtian Academy, which is remarkable in history, has long been destroyed in the war, and the current Yingtian Academy has only been built for more than ten years.

Li Changqing walked around the academy and found nothing, so he rode against the wind and returned to Kaifeng before Huang Yulang and the others.

Huang Yulang and the others returned to Kaifeng and did not enter the city, but waited in a villa in the suburbs for two days.

Li Changqing asked Nedutong to leave a whistle far away, and he himself was like an ordinary tourist in Kaifeng City during the day, wandering around the major scenic spots, and when Huang Yulang and others came out of the villa, Nadutong's whistle immediately notified Li Changqing, and Li Changqing followed it personally.

On the night of the third day, the villa in the suburbs finally moved a little.

Huang Yulang was extremely suspicious, and although he didn't find anyone spying on them, he still sent three cars out one after another, and he himself mixed in the middle car.

But if you don't enter Jindan, you can't imagine Jindan's ability.

In Li Changqing's eyes, this kind of trick was completely a trick, and he could see through Huang Yulang's car in the middle at a glance.

After Huang Yulang's car entered the city, he walked around the city aimlessly a few times, and finally stopped outside the ancient city wall of Kaifeng.

The last of the three or two cars went to the hotel behind the railway station, put Ning Caicheng in a sack, put it in the trunk and drove it outside the ancient city wall of Kaifeng.

Li Changqing hid five miles away, watching all this, he thought that Huang Yulang and the others would go to Longting Park, but they came to the ancient city wall of Kaifeng.

He had checked this place before, but found nothing special.

Huang Yulang took out a few array flags and handed them to the two apprentices, planting them in several different directions outside the ancient city.

The Earth Evil Gathering Yin Array!

This formation is used to induce the venting of the underground evil qi, gathered in one place, and is a formation that can be attacked and defended.

But in the current situation, Huang Yulang is obviously not used against the enemy, and there is no defense statement.

When he was in Longting Park, the fourth-level infection source could only attach to the old willow tree, and could not leave the old willow tree, indicating that the fourth-level infection source was somewhat restrained, and Huang Yulang's purpose of arranging the Gathering Yin Array was about to come out.

Li Changqing didn't stop Huang Yulang from setting up the formation, the reason why he gave Ning Caicheng a few runes with only a trace of aura was to find out the source of infection behind the control of Qianqian and other female ghosts.

After the Earth Gathering Yin Array was arranged, a large amount of black gas emerged from under the old city gate.

From underground, there was the sound of footsteps on the bluestone bricks, followed by the tooth-sore sound of the door opening.

The process was so difficult that it seemed that it took a lot of hard work to push open only one crack.

More and more black gas came out of the ground, and then there was a tiger roar that resounded through the heavens and the earth.

The sources of infection that erupt from the ground are all gifted with supernatural powers, and this supernatural powers are related to their heels.

The fourth-level infection source that Ren Fei pursued before was most likely from the battlefield general, so its talent was to summon cavalry.

And now the source of infection that controls Qianqian and others is an alien who can control the soul, and the whistling sound has a soul effect.

Fortunately, there were only three masters and apprentices of Huang Yulang near the old city gate, as well as Ning Caicheng, who was unconscious.

Among several people, Ning Caicheng was an ordinary person, but he was in a coma, and he was the least affected by the sound of the tiger's roar.

Huang Yulang was able to seriously injure Qin Yuanlong, the first person in the Yin and Yang Feng Shui world at that time, in the case of a sneak attack more than forty years ago, and he was not weaker than Qin Yuanlong back then, I don't know what kind of secret method was used, and he treated it indifferently in the whistling sound, and it didn't seem to be affected at all.

The middle-aged man with glasses and the sturdy man with short hair covered his ears, like a drunk drunk who couldn't stand at all.

After Ren Fei rushed over in person, he was mainly responsible for the monitoring of the periphery, which was extremely far away from the old city gate, and he faintly heard the whistling sound, and he felt dizzy, and he couldn't help but look into the distance in confusion, "The fourth-level infection source encountered here is for the Divine Soul class, which is even more tricky than the last time, fortunately, Master Li is here!

The whistling continued for a few seconds and then immediately stopped.

The old gate seemed to go back to the scene of hundreds of years ago, and a tall and majestic figure emerged from behind the gate, the shape of a standing tiger, with its two paws pointed upward, as if holding something.

Li Changqing immediately figured out the process before and after, the figure in the black qi was the true body of the fourth-level infection source attached to the old willow tree in Longting Park, he was trapped in it and couldn't get out.

Huang Yulang's Earth Evil Gathering Yin Array could only temporarily get the fourth-level source of infection out of trouble.

In order to emerge from it, there must be a suitable human body.

And Huang Yulang's apprentices will refine corpse slaves, presumably Huang Yulang has obtained other secret methods in the past few decades, which is very likely to be related to corpse refining.

Refining corpses requires well-preserved special corpses, which are difficult to find in real life, but there may be many opportunities in the place where the black qi lurks.

Huang Yulang reached an agreement with the fourth-level infection source, Huang Yulang found a suitable living body for the fourth-level infection source, and the fourth-level infection source sent Huang Yulang a corpse suitable for refining.

Ning Caicheng's aura is full of talent, and after being extracted by Qianqian a few times, he recovered extremely quickly, which attracted the attention of Huang Yulang's great apprentice, and he was an excellent human body, which was very suitable for taking away the source of infection.

To deal with the fourth-level source of infection, Li Changqing mainly has two methods, Haoran Righteousness and Lei Fa.

Both have their own advantages, Haoran righteousness needs a process of guiding the accumulation, but after the accumulation of momentum is like a dam of water, and when the water level rises, open the floodgates and rush down, surging and unstoppable, at some times can be small and big, the law of thunder is a little faster, and the destructiveness is also extremely strong, but it is more a test of the control of the thunder law.

Before Li Changqing formed the Jindan, the Confucian Haoran righteousness was used more, and he had time to gather momentum in several battles.

But this time, as long as his Haoran righteousness leaked, the fourth-level infection source five or six miles away sensed it and fled back to the place where he was currently hiding, Li Changqing couldn't do anything about it.

So Li Changqing decided to attack with the thunder method.

Yin and Yang Tai Chi God Thunder.

This is the only thunder method that Li Changqing has mastered, he has condensed a divine seed, although he has not deliberately practiced it over the years, but Li Changqing has a deeper understanding of the way of yin and yang, and the power of the yin and yang Taiji divine thunder is naturally greater.

Outside the Old City Gate.

The fourth-level infection liked the human body that Huang Yulang found for him, and Huang Yulang was also very satisfied with the corpse brought to him by the fourth-level infection source.

At this time.

A gray lightning bolt struck down in the air without warning.

Since it was night, the gray was inconspicuous in the night.

The fourth-level infection source raised his eyes to the sky, and did not pay much attention to this weak lightning.

"Crackle!"

Lightning fell.

Just now, just a tiger roar shook the surrounding creatures unstable, and before he could exert any natural powers, he was wiped out under such an inconspicuous thunderbolt.

Under the divine thunder, the ashes are gone!

"This ...... What's going on...... , it doesn't seem like it's going to rain, how come it was a thunderclap and that thing disappeared?"

"Is it a thunderbolt that came out of thin air? It's too coincidental, it's impartial, and it doesn't look powerful, but it easily splits that thing!"

The middle-aged man with glasses, and the sturdy man with short hair, looked at each other and didn't react to what was going on, but they had been in contact with the fourth-level source of infection once or twice, and knew the horror of that thing.

"This is Lei Fa!", Huang Yulang has a lot of experience in the rivers and lakes, and immediately distinguished that this is not an ordinary heavenly thunder, but a Lei Dao master who uses the Lei Fa nearby.

Speaking of Lei Fa, the former Shenxiao Sect has long since disappeared, and only the Dragon Tiger Mountain Heavenly Master Mansion is famous for Lei Fa.

Although Li Changqing had used the thunder method on Luo Tian Dajiao, Dan's realm was low at that time, which attracted everyone's attention, but it did not spread on a large scale.