Han Feng had a contemplative look on his face, and he gently tapped this pill prescription, not knowing what he was thinking.

"Senior, I only have this Dan Fang, you can take it easy, don't let it self-destruct. Seeing his contemplative appearance, Lin Xiaoyue couldn't help but worry, and hurriedly reminded.

"Don't worry, I won't mess around, I'll point out the problems with it first, you go and buy me seven auxiliary materials, otherwise you won't be able to refine successfully." Han Feng smiled slightly and said comfortingly.

When Lin Xiaoyue heard his explanation, her eyes couldn't help but light up, obviously she also knew the way of alchemy, but she didn't think about it to reach Han Feng's level, otherwise she wouldn't have failed to see through this pill formula.

"You go back, prepare the spiritual materials and come to me again, I will refine the Tianyuan Pill for you." Han Feng said lightly.

Lin Xiaoyue nodded, saluted respectfully, and turned to leave.

Han Feng stopped for a while, and quickly left the restaurant, returned to Jianshan City, and continued to study the Danfang.

He pondered it carefully, and found that the material of Lin Xiaoyue's Danfang was really exactly the same as Xie Gui's, but it was made of unknown materials, and it looked like a yellowed piece of paper, but he pulled it hard, and there was no sign of cracking, you can imagine their toughness.

He cautiously injected mana into Xie Gui's Danfang, but there was no reaction, and the infusion of soul power was the same result, even if it was to inject the power of blood qi, it would not help.

Han Feng stopped, suddenly had an idea, took out the Broken Sky Sword, and injected the three powers into its body, merging into one, allowing these energies to blend together, turning into a milky white light, slowly pouring into the yellowed Dan Fang, it actually had an effect, it absorbed these white lights like hunger and thirst, and then let it emit a hazy yellow light, and the pieces of paper slowly derived as if flesh was wriggling, this scene was similar to when the broken sword was reborn.

Han Feng was stunned, he couldn't understand why this was the case, and hurriedly stared at the part of it that was extended, and found that the content on it was similar to the direction he had deduced before, but it was more subtle, and the original problems were also solved here, the method was extremely mysterious, and it was done with only three completely different auxiliary materials, and the medicinal effect had also reached the level of twelve grades.

This is similar to the parchment scroll, and I wonder if there is any connection between the two?

Han Feng's eyes flickered, and he suddenly took out the parchment scroll from the storage ring, and after careful comparison, he didn't find any similarities between them.

In addition, once that Danfang was not supported by the white light transformed by the Heaven Breaking Sword, it would stop evolving, and even the original content would disappear without a trace, as if everything was only temporary and would not be preserved for a long time.

Han Feng had no choice but to continue to pour the three powers in his body into the Heaven Breaking Sword, condensing layers of white light into the pill, causing it to resurface the follow-up content, but it stopped at the level of the twelve-rank and encountered great obstacles, unable to go further.

Han Feng's brows furrowed, and he suddenly exerted force, and the Heaven Breaking Sword released an even more majestic white light, completely submerging this Dan Fang, faintly there were flames, and the crimson light shot out in all directions, reflecting in all directions.

He gradually felt strained, and the three powers in his body were rapidly depleted, as if he was fighting against the mysterious power within the Danfang, trying his best to unravel its mysteries.

"Sneer......"

Not long after, a strange sound spread, and the Dan Fang finally expanded in all directions again, the content was extremely rich, reaching the level of the Spirit Pill, and the refining method was wonderful, which made Han Feng also admire it.

He now guessed that this pill recipe was most likely made by an alchemy celestial master, otherwise there would not have been such a miraculous performance.

In the field of alchemy, as long as a monk can refine mortal-level pills, they are all called alchemists, but the grades are different. After reaching the level of refining elixir, he rose to the level of alchemy master. And the monk who can refine the Heavenly Pill is the Alchemy Heavenly Master. As for the Dao Pill, it was an elixir that only the Enlightenment Dao Realm and even a saint had the ability to refine.

Han Feng once saw the introduction of Dao Dan in a classic, saying that it can help monks to achieve enlightenment, of course, the threshold for taking this kind of pill is extremely high, at least it has to be a person in the late stage of Tianyi Realm, it is best to take it by a big person in the Enlightenment Realm, the effect will be better. Even saints have a great demand for Daodan.

Han Feng shook his head, put aside these distracting thoughts, and devoted himself to studying the expanded content of this Dan Fang, these are all mysteries that can be encountered and cannot be found, if they are fully mastered, it will also be of great benefit to his Dan Dao cultivation.

Half an hour later, more than half of the three powers in his body were consumed, and he also successfully memorized the elixir of this Dan recipe silently, knowing it well, as long as he studied it repeatedly in the future, he could start refining it when he had the right spiritual materials.

Even when it reached the spirit pill level, the name was still Tianyuan Dan, but the medicinal effect was completely different.

What's more, what's even more peculiar is that this pill can change different auxiliary materials at will, and even some of the main materials can be replaced, and through various optimized combinations, a more powerful pill can be derived, and there seems to be no limit.

Han Feng was becoming more and more curious about this, he really couldn't understand the operation mechanism of this Dan Fang, but he also knew that his realm was limited, and no matter how he explored, it would be difficult to decipher the mysteries, so it was better not to think about the deep reasons for this for the time being, and first get out the Tian Yuan Dan that could be refined at the moment.

He thought for a while, and suddenly remembered that there seemed to be those three auxiliary materials among his trophies, and the main materials were all there, which were in the air-conditioning storage bag that Xie Gui and Lin Xiaoyue gave him.

He immediately took it out, went to the practice room, combined it with those main materials, took out the Dan furnace, put it in turn in turn, and refined it according to the Fu Dan Lotus Method.

This is only a ten-grade level elixir, for him, naturally there is no difficulty, just a stick of incense, he successfully refined a pill of Tianyuan Pill.

He didn't want to attract attention, so naturally he wouldn't bring this pill to the five-flower level, otherwise he would trigger a thunder tribulation, and everyone would know about his existence.

In this way, he will definitely be targeted by the Feather Immortal Sect, and at that time, it will be unpredictable, and it is very likely that there will be big trouble, even if he will not be killed, he will be captured by the other party and become their alchemy slave.

Even if the Feather Immortal Sect treated him with courtesy, he didn't want to be limited by others, and after a long time, it was difficult to guarantee that many secrets on his body would not be discovered.

Therefore, he only raised the level of this pill to the level of four flowers, and the medicinal effect also reached an astonishing level, almost comparable to the eleventh grade pill.