Under Han Feng's inward look, he found that the medicinal power of the great medicine turned into a pale golden special spiritual power during the operation of the exercise, and it drilled into the back bone like an awl, which was extremely intense, as if it had derived a brilliant firelight, which made him feel painful.

He gritted his teeth, clenched his hands, and sweated profusely.

Han Feng's body began to glow brightly, and his fierce power burst out, and even the void was slightly distorted, which was terrifying.

This secret room immediately lit up, and the lines on the four walls flashed, forming the power of the formation, resisting the power that burst out of Han Feng's body.

When the two collided, there was a dull humming sound, and the void became more distorted, refracting the colorful light, and the splendor contained unspeakable danger.

Han Feng was completely unaware of everything that was happening in the outside world, and at this moment he was engrossed in running the exercises, using the power of the great medicine to open up some key acupuncture points.

Only by penetrating the qi can he break through to the realm of dragon descending, otherwise a body of incomparably hard bones will not be able to exert its true power.

With the infiltration of the power of the great medicine, Han Feng's backbone was shining, and the golden light was shining all over his body, becoming more and more brilliant, but it also invisibly turned into a resistance, resisting the invasion of the power of the great medicine, making him unable to connect for a long time.

This made him feel a sharp pain and unbearable suffering.

Han Feng did not give up and continued to work hard, but he was never able to break through and failed to reach that realm.

It didn't take long for the medicinal power of this Nine Rank Great Pill to be consumed and overflow in his body, not reaching the point of effectiveness, which could be regarded as a waste of a Great Medicine.

Moreover, it also made Han Feng suffer in vain and suffered.

Han Feng gasped and sweated, and it took a long time for him to recover.

He stood up, picked up the book again, and studied it carefully, silently reviewing the cultivation just now, looking for the problems in it.

Han Feng frowned, he did find a few problems, but in the final analysis, it was mainly caused by the lack of medicinal power of the Nine Rank Great Medicine, and he needed to swallow a more powerful Great Pill to be able to break through the bottleneck.

Thinking of this, he immediately took out a ten-grade medicine and swallowed it, and ran the third volume of the Spirit Alchemy Vajra Technique again.

A quarter of an hour later, he opened his eyes in disappointment, and this time he failed.

"Ten kinds of medicine can't work?" Han Feng wondered, silently breathing, resting his body.

He thought about it for a while, and decided to take a gamble, take out one of the three twelve-grade medicines, put it in his mouth, and swallowed it.

In an instant, the ferocious medicinal power filled his entire body, as if it was burning, and he hurriedly ran the third volume of the alchemy vajra technique, carefully combing the flow of medicinal power, and focusing on one point, the purpose was to break the barrier of the backbone, so that the power of his golden bones could be released, complete the final step of transformation, and form the shadow of the true dragon.

This is the origin of the name Dragon Realm!

To break through this realm is to subdue the true dragon in the body, so that it can be released and show its true power.

Of course, the premise is that the bones of the whole body have been tempered in place, exuding a majestic golden light, and it is possible to condense the shadow of the true dragon, otherwise it will be in vain.

Han Feng had already refined the bones of his whole body to this level, but he had never had the third volume of exercises, so he couldn't further improve.

Originally, he thought that as long as he had the third volume of exercises, he would break through this bottleneck by himself, but it would be a matter of course.

However, now he knew that things were not so simple, even with the third volume of exercises, and even enough elixir to nourish them, he couldn't succeed several times in a row.

This made him have to re-examine this exercise, which was by no means comparable to ordinary exercises.

He calmed down and analyzed carefully, pondered repeatedly, and finally understood a truth, what cannot be achieved with the power of big medicine alone, after all, even if it is big medicine, there must still be impurities left, and the purity cannot be 100%.

"Since this is the case, there is only alchemy!" Han Feng came to his senses, if he wanted to purify the medicinal power, he really had to refine the great medicine into an elixir, so that he could dissolve the impurities and nourish his body.

Han Feng looked left and right, looking carefully, naturally he didn't see any platform that could be used for alchemy.

In fact, even if there is an alchemy room, he will not do alchemy.

"Is it possible to start studying now?" Han Feng thought about it, he had classics on alchemy, and he had obtained a lot of ancient books from those opponents before, and there were many secret books of alchemy.

However, alchemy, like drawing talismans, is not only a Taoist method, but also a technical work, which cannot be achieved simply overnight, and requires long-term practice to be exercised.

Of course, Han Feng could also put away all the things here first, and wait until he got out of this secret realm before breaking through the Dragon Descending Realm. However, time waits for no one, he entered this secret realm this time, killed so many children of the family, and there is a bounty order from the Sanye Gate outside, he has no strength to be around, he is absolutely unable to parry, maybe as soon as he appears in the outside world, he will be chased by a storm!

"Well, let's go out and see the other two secret rooms first, maybe there will be a surprise!" Han Feng thought of this, turned around and left, passing through the arch behind him.

The light film of the arch fluctuated gently like a curtain of water, and Han Feng crossed out, returned to the medicine garden, turned to the left, and went to another arch.

He stepped over the light curtain and walked into it, which was also a secret room, much smaller, only five zhang wide.

There was also a table in the middle of this secret room, made of stone, like jade, and on it was also placed a pale cyan book, slightly shiny.

Han Feng was deeply curious, walked up quickly, picked up this danqing classic and flipped through it, and was attracted by it as soon as he opened it.

It turned out that this was an alchemy classic, but unlike the ancient alchemy books that Han Feng had read before, this book was very thin and thin, and it only had seven pages of content, but each page had dense words, as long as he looked at it, those words would emit a danqing light, and at the same time float up, like lightning into his eyebrows, forming a massive amount of information.

These contents are really word-for-word, and they have a deep understanding of alchemy, which makes a layman like Han Feng feel like he is suddenly opened.

At this moment, he couldn't help but feel a little more confident, maybe he could really quickly achieve alchemy.

The main reason for this is that the alchemy method of this ancient alchemy book is similar to the art of drawing talismans, and there are common places in the technique, which is called the Fu Dan Lotus Method!

Han Feng pondered it carefully and found that it was indeed the case, alchemy and talisman essentially use soul power to control the process, but the former is aimed at medicinal power, and the latter is aimed at talismans.

He was immersed in it, and in less than a day, he successfully wrote down the entire content of this Fu Dan Lotus Method, which was engraved in the sea of souls.