In the cave mansion of Elder Xu of the Alchemy Hall, Xiao Yu was comprehending the Xuan Condensation Technique at this time, Xiao Yu's qualifications Elder Xu was naturally very clear, and knew that it would not be long before this little apprentice would understand this set of methods thoroughly, so he closed his eyes and recuperated on the side.

Sure enough, three days later, Xiao Yu opened his eyes, and Elder Xu asked with a smile, "But you have all comprehended, is there anything else that is not transparent?"

Xiao Yu hurriedly shook his head and said, "This set of methods is not difficult to comprehend, the disciple has already understood it thoroughly, will the disciple practice this set of rules next?" Elder Xu said: "I'm not busy! Next, I want to tell you about the secret technique of the Dan Dao that alchemists dream of, and I won't be able to teach this secret technique, but all the alchemists know the existence of this secret technique." ”

Xiao Yu had already pricked up his ears at this time, he knew that what the master said next must be unusual, at this time Elder Xu continued: "The apprentice must be a little anxious, but you first take a look at this top-grade Gathering Spirit Pill, look carefully and look at it with your heart, and see what you can see!"

Xiao Yu took the pill and observed it carefully, but after looking at it for a long time, he didn't find anything different, so he said to the master: "This is an ordinary top-grade pill, I don't know what the master wants the apprentice to see!"

Elder Xu didn't explain too much, but just said to Xiao Yu: "Keep looking, look with your heart, you can't see it with your eyes!"

Xiao Yu observed it carefully, but he thought of the phrase 'look with his heart' that his master said, and he noticed that his heart was not to use his divine sense, so Xiao Yu activated his divine sense to observe the elixir.

Now Xiao Yu finally found that he could indeed see more realistically with his divine sense, and the pill was no longer what it looked like on the surface.

It turned out that there were countless small holes in the elixir, and most of these small holes were empty, and only some of the small holes seemed to have something in them.

Xiao Yu carefully observed those things that existed in the small hole, only to find that those were actually spiritual power crystals formed by the condensation of spiritual energy.

Xiao Yu then understood the true purpose of the master to let him look at this elixir with his heart, it turned out that what the master let him see was not the elixir, but the spiritual holes in the elixir, and these spiritual holes were the places where the spiritual energy was stored in the elixir.

But obviously, a large part of these spiritual holes are empty, only some of the spiritual holes have spiritual power crystals, and the top-grade pills are still like this, so the lower-grade pills are not the pity that there are fewer spiritual energy crystals in the spirit holes, it seems that this is the fundamental reason for the huge difference in the quality of the pills!

Xiao Yu took out another low-grade pill and studied it, unfolded his divine sense and entered the pill, and found that not only were most of the spirit holes empty, but also some of the spirit holes were full of impurities.

Xiao Yu patiently checked this lower-grade pill again, and found that the situation was not only like this, but there were far fewer spiritual holes in the lower-grade pill than in the top-grade pill.

Now that he finally understood that Weishenme could refine the middle grade pill at most with the lower grade materials, but there was no way to refine the top grade pill no matter what, Xiao Yu felt that his heart suddenly brightened at this time.

At this time, Elder Xu also noticed Xiao Yu's expression, and saw that he finally stretched out his frowning brows, so he said with a smile: "Apprentice, but you can see it, now you know why the teacher asked you to look at this pill with your heart!"

Now you should also understand that the Xuanning recipe taught to you by the master can only be used to refine the middle grade pill, at most, it is to use the middle grade pill to refine the top grade pill, but it is impossible to use the top grade pill to refine the top grade pill anyway.

That's because when the materials of different years are refined into pills, the number of spirit holes constructed by the elixir essence in the elixir is different, no matter how superb your alchemy technique is, and no matter how high your Xuan Condensation Technique realm is, the year of the essence in the elixir is not enough, and you can't construct enough spirit holes.

Therefore, if you want to refine the best elixir, you still need at least high-grade materials to achieve it, but if you can refine the best elixir, then even if there is only one, you will become the best existence among the first-grade alchemists, even if it is a second-grade or even a third-grade alchemist, they dare not underestimate you, because a third-grade alchemist may not be able to refine the best first-grade elixir. ”

Elder Xu has been extremely obsessed with the way of alchemy all his life, so when he saw that Xiao Yu was such a disciple, he naturally did not hide his selfishness, and continued: "To use the top-grade pill materials to refine the top-grade pill, is to find a way to fill all the spiritual holes in the top-grade pill with spiritual power crystals, so that the top-grade pill naturally contains the aura that only the top-grade pill has, but there are two difficulties that are extremely difficult to do, do you know what these two difficulties are?"

Xiao Yu thought for a while and said: "One of the difficulties is that the aura contained in each pill is not exactly the same, and the ordinary aura in the surrounding air has no way to fuse with the aura in the pill, so forcibly pouring the surrounding aura into the pill is not only not beneficial, but also may destroy the medicinal properties of the original pill, then the gain outweighs the loss."

This second difficulty is that there is no way to send the aura with the same attributes as the pill into the spirit hole of the pill, if the aura in the gas state enters the spirit hole, after the pill is baked, the aura will soon dissipate, if the solid state of the aura is sent into the spirit hole, I am afraid that the original structure of the pill will not be able to withstand it at all, and then the pill is likely to collapse, so this point is even more difficult to do than the first point!"

After listening to Xiao Yu's words, Elder Xu nodded and said, "Yes, these two points are where the difficulty lies! In ancient times, before the ancient alchemy was lost, in fact, there was still one step to do before the alchemy was baked, and this step was even more important than all the previous things, maybe you would have seen it in some ancient books, that is, the art of injecting spirits."

The ancient alchemist performed the spirit injection method after becoming a pill, and injected all the aura in the Dan furnace into the elixir, so that the quality of the elixir would rise a notch out of thin air, but now the spirit injection method has long been lost, and the current alchemist did not complete all the steps of alchemy when he made the alchemy, and the refined pills were only half-finished, just because of the lack of the spirit injection method!"

Elder Xu sighed, and then said, "Now many people in the alchemy world are studying the art of infusion on their own, and there are already a few geniuses who have studied the simple art of injecting spirits, although it is not like the complete infusion method that those alchemists in ancient times had, but it still helps to improve the quality of the elixir.

Now those alchemists have all advanced to the realm of the Great Grandmaster, and they are only one step away from the alchemy master, all of them are the top existences in this world, and the master has been studying the Spirit Injection Method for many years, but he has not found the way.

After all, the cultivation for the teacher is limited, and the contact with the law is also very rare, but for the teacher to find a new way, these years have also been gained, for the teacher to teach you all today, I hope you can continue to study, one day can really improve this method, the teacher of the Dan Dao to carry forward, the blue out of the blue is better than the blue, on the basis of the teacher to go further!"

Xiao Yu didn't dare to sit there and listen now, now it was the master who really taught him his life's learning, so Xiao Yu hurriedly knelt down, this time Elder Xu didn't let Xiao Yu get up.

Instead, he continued: "The first difficulty when injecting the spirit is that the master decided to make up for it with the aura of the pill itself, so after becoming a pill, he used the Xuan Condensation Technique to condense all the Dan Qi in the Dan furnace into a liquid aura, so that the aura that can be fused with the pill will also be available, which I believe you can also think of."

The solution to the second difficulty is to rely on the formation, when the spiritual liquid is injected into the spiritual hole of the elixir, and then a spirit sealing array is cast on each elixir, the aura in the elixir will not escape, but the elixir is always to be taken, so the material of the sealing array must use the material of the elixir itself.

Applying the elixir material without aura to the outer layer of the elixir as the material of the spirit sealing array is like beeswax on the elixir, so that although the high-grade elixir is not as good as the top-grade elixir, it will not be far behind!

Xiao Yu hurriedly said: "Master, you are really a genius of the heavens, this method is very wonderful, it is wonderful to be able to think of using the power of the formation to prevent the leakage of spiritual energy!"

Although Xiao Yu said this, although he was a little suspicious of sycophancy, Elder Xu still had a proud smile on his face when he heard it, he did have proud capital, how many alchemists in the world were studying the art of infusion without any achievements, and he was able to research this kind of effective alternative method in just two hundred years, which was really worthy of the name of genius.

Xiao Yu actually really admired Master's ability, just now he had deduced the method that Master said countless times in his heart, and found that it was not only feasible, but also very effective.

Once he has practiced the Xuan Condensation Technique to the fullest, at that time, with his superhuman soul realm, even if the aura crystal is broken, it is not difficult to fill it into the spirit hole, and the outside of the elixir is added to prevent the spiritual energy from leaking out, and the best elixir is not hopeless to be refined!

After Elder Xu finished speaking, he personally demonstrated it, and sure enough, the aura contained in the top-grade pill after the infusion of the spirit was indeed much more than that of the ordinary top-grade pill, Xiao Yu had not taken the top-grade pill, but the effect of taking the top-grade pill refined by the master was indeed obvious.

He will no longer feel that the top-grade elixir has no effect on him, and his cultivation has risen obviously, and now Xiao Yu has finally found a way to solve the slow improvement of his cultivation in front of him, but the premise is that he must first learn all the skills of his master.

It's one thing to understand it, it's another thing to operate it yourself, Xiao Yu deeply understands this, there are a total of two tasks that need to be completed now, one is the Xuan Ning Jue, which is not difficult to practice, and the second is to be proficient in the spirit sealing formation, after all, he has a bit of a foundation in the way of the formation, and it will not be too difficult to think about it, and now the rest is practice.