Noticing this scene, Liu Yu stopped taking action, with a slight smile on his face.

Combining theory with practice, his current Yuan Shen attainments placed in Tiannan will probably amaze many Nascent Soul old monsters.

Under the effects of various spiritual objects, not only did the Niwan Palace remain as stable as Mount Tai, the handsome young man also had the tendency of his soul to collapse, and he continued to be tempered by the gray air flow.

The fist-sized pale gold soul grew stronger under the nourishment of various spiritual objects, and then shrunk under the tempering of the gray air flow, repeating this process.

Extreme pain was constantly coming from the soul, and painful and even distorted screams were constantly heard in the room.

Just by hearing his voice, you can imagine the pain he is going through.

Fortunately, with Liu Yu's intervention, the handsome young man's life was not in danger.

One breath, two breaths, three breaths

Less than half an hour later, all the power of the black elixir was finally absorbed by the handsome young man.

At this time, the prototype of this son's soul was actually much stronger than it was at the beginning, and it was even more condensed than some foundation-building monks.

Such an effect is naturally due to various Yuanshen creatures.

The total value of the spiritual objects used just now is almost equivalent to two "gold-forming pills". They were taken by a mere Qi Refining monk, and the effect was immediate.

"This kind of soul strength has surpassed many monks in the early and middle stages of foundation building."

"Only the third level of Qi Refining, the range of spiritual consciousness is about one mile, which is already comparable to that of newly promoted foundation builders."

"The most important thing is that after this cleansing, his spiritual potential has been greatly improved."

"Every time you improve your realm in the future, the growth rate of your soul should be higher than that of ordinary monks."

"good."

Under Liu Yu's observation, any changes in the experimental subjects were undetectable.

Overall, the experiment was considered a success, and he was quite satisfied with the results.

As for the few resources, he didn't care about it. As long as he could refine the "Soul Cleansing Pill", everything would be worth it.

After all, using the Immortal Mansion to induce the birth of spiritual creatures costs far less than normal.

"Hiss~"

"senior."

After a long time, the handsome young man opened his eyes, but couldn't help but suck in the cold air, and managed to cheer up and speak.

At this time, he was sweating profusely, as if a basin of hot water had been poured over his head.

But if you can survive, you can obtain resources beyond your imagination.

In addition to the fear in this child's heart, uncontrollable joy arose, and the color of ecstasy was beyond words.

The voice of No. 398 sounded, surprising Liu Yu who was thinking.

"Don't worry, I'll stick to my word."

"For a junior like you, I won't break my promise and get fat."

Once he saw through the other person's thoughts, Liu Yu was in a good mood and said a few words.

"Thank you, Senior Qingyang!"

"Senior's great kindness and kindness will be unforgettable by juniors, and they will be sure to do so in the future."

Hearing this, the handsome young man was overjoyed. Regardless of the pain of his soul and body, he struggled to get up and was about to salute.

Liu Yu gently raised his hand and fired a burst of magic power to stop this boy's movement.

"No need to thank me, it's just a transaction of equal value. You deserve all this."

Liu Yu regained her composure and said calmly with no expression on her face.

What the handsome young man didn't know was that there were 397 monks before him who had devoted their lives to the truth in obscurity.

The risk of trying drugs is so high that you may almost die.

Being able to survive by chance, to a certain extent, is indeed a chance, and this is a fair deal.

Of course, Liu Yu was just a Qi Refining monk, so it would be easy for Liu Yu to regret it, but it was not necessary.

Even though he was so close, with his current methods, it was too easy to control a Qi Refining monk.

In the process of refining the elixir, the handsome young man had no idea what spiritual objects he had taken.

Apart from using his skills to refine the medicine, this man knew nothing about the whole process, so there was no need to kill anyone and silence him.

Under normal circumstances, Liu Yu is still willing to keep his promise.

Next, he went into detail, asking the handsome young man how he felt during the process, and observing the subsequent changes after taking the elixir.

It was not until half a quarter of an hour later that Liu Yu summoned Wen Caiyi and arranged for a maid to stay with the handsome young man and arrange for him to practice at Qingyang Peak.

As for the three "Foundation Building Pills", they were handed over to this son on the spot.

This arrangement has deep meaning, not only to cash in the rewards, but also to observe the side effects of taking the elixir.

Some side effects may not occur immediately, but may occur after a period of time.

"tread"

The footsteps gradually faded away, and the handsome young man followed a maid, whose figure quickly disappeared from sight.

From beginning to end, Liu Yu did not ask for the name of the experimental subject, but recorded it directly by number.

As the realm improves, the influence of the transformation of life essence, bloodline, tradition, etc. on the monks gradually weakens, and some concepts also change quietly.

"This experiment is barely a success."

"But just in case, the remaining two directions also need to be tested one by one."

In the laboratory, Liu Yu thought quietly.

This experiment is successful. As long as we continue in this direction, it is possible to obtain the real "soul-cleansing pill" prescription.

However, the follow-up still requires a lot of experiments, which require the cooperation of foundation-building monks.

But trying to impress a foundation-building monk is not an easy thing, and its influence is not comparable to that of a Qi-refining monk. If you are not careful, it may cause very bad effects.

To be on the safe side, Liu Yu will personally handle the entire process from beginning to end.

After counting his breath in meditation, he took out his alchemy notes and wrote down the entire process of the 398th experiment in his notes.

Then a message was sent to Wen Caiyi, asking the woman to bring someone in to continue the next experiment.

…

Improve your cultivation level and experiment with soul-purifying pills.

When you focus on two things, time passes extremely quickly, and a year flies by in an instant.

One year later, the practice room.

Liu Yu looked at the longan-sized and light-gray elixir between his two fingers, and there was some fluctuation in his eyes.

After hundreds of experiments and the dedication of hundreds of Qi Refining monks and more than twenty Foundation-building monks, the real elixir recipe was finally deduced.

At this time, the number on the alchemy notes suddenly came to "437".

"Continue to observe for a period of time and make sure that the surviving monks have no serious side effects. Then you can almost take this pill."

After hundreds of experiments, Liu Yu is still very rigorous even though he is confident.

Make sure there are no serious side effects before taking the elixir yourself.

After putting away the "Soul Cleansing Pill" and recording the experimental data, he stood up and walked outside.

Soon after, Liu Yu came to a cliff alone, took out the thick "Book of Herbal Pills", and burned it with flames from his fingertips.

"Zizi~"

Under the illumination of red fire, the alchemy book will soon turn into ashes.

The biggest regret of Baicao Zhenxiu, who wrote the alchemy book, was that he could not deduce the elixir recipe. He hoped that if the later generations could deduce the elixir recipe, they could burn a copy to inform him who was already dead.

The content of Baicao Alchemy Book is penetrating. Throughout his entire alchemy career, this book inspired Liu Yu the most.

Learning from previous knowledge is just a matter of effort, so of course he doesn't mind completing it.

The recipe for soul purifying elixir has been completely written on the last page of the elixir book.

"In this way, Baicao Zhenxiu, who has fallen, should have no regrets, right?!"

"This kind of monk who spends his life searching for the truth"

Liu Yu put his hands behind his back and silently watched the Baicao Alchemy Book turn into ashes, feeling a bit of respect in his heart.

In his opinion, Baicao Zhenxiu, who has spent his whole life studying the art of alchemy, may be greater than the Nine Dragon God Lord.

It has nothing to do with the realm of cultivation or honors and achievements.

"This Baicao Alchemy Book seems to have been given to me by my master during my apprenticeship."

After a long time, Liu Yu's eyes flashed with an inexplicable luster.
Chapter completed!