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"Boom-"

As soon as the earth's spiritual fire entered the Red Cloud Danding, it was like igniting thousands of tons of explosives, and the entire Danding burst into flames, like a wild beast roaring in the ancient wilderness.

"The Earth Soul Fire is really domineering, fortunately, this Red Cloud Danding is a low-grade treasure, otherwise the flame impact formed by the Earth Soul Fire alone is enough to make it blow to pieces. Chen Feng secretly said in his heart, but his eyes did not leave Hongyun Danding for a moment.

In just a few breaths, the Red Cloud Danding has been completely heated, and the entire Danding is like a miniature version of the sun, emitting a roaring heat, and all kinds of fire elements permeate the entire room, making the temperature in the entire room rise directly.

Shen Chen, who was comprehending, raised his eyebrows, although his eyes were closed, he could still vaguely feel the ecstasy in his demeanor. The flaming aura of the earth's soul fire made him, a person who had just peeked into the door, feel like a fish in water.

Chen Feng didn't have time to pay attention to his Dantong's progress, at this time, he was looking at the various medicinal materials suspended in mid-air with serious eyes.

"The Three Turns of the Great Returning Dan, although it is still a little reluctant to refine with my skills at this time, but with the Earth Soul Fire, I believe that there should be no accidents when I refine it. Chen Feng muttered to himself.

"Clumsy—"

With a soft snort and a squeeze of his mind, Chen Feng's thoughts became extremely clear. This is a habit he has always maintained in his 10,000-year alchemy. Only with a clear and incomparably clear spirit can there be no mistakes in every tiny process, which greatly improves the success rate of alchemy. Throughout the ages, there have been countless examples of how much difference has gone wrong.

Under Chen Feng's True Yuan control, the lid of the Red Cloud Danding suddenly opened, and a stream of red flames burst out, like a flame demon, dancing in the Danding with teeth and claws.

"Red Maple Spirit Grass, go-"

Chen Feng stretched out his fingers, and a red medicinal herb was faintly thrown into the Red Cloud Danding. In the blink of an eye, the body of the medicinal herb turned into a red juice. This is the essence of this herb.

The crimson juice was produced, and a faint fishy smell wafted out faintly, like a stinky fish that had been rotten for ten days and half a month.

However, Chen Feng's expression did not change at all, as if he had not smelled this smell at all, and his mind completely entered the medicinal materials in front of him.

"Broken Moon Grass, go-"

Under Chen Feng's control, a silver-white herb shot away, instantly turning into a medicinal juice in the earth's spiritual fire, fusing with the crimson medicinal juice.

A strange thing happened, as soon as the two medicinal juices fused, the original stinking smell disappeared, and instead a faint fragrance wafted out, making Chen Feng feel like he was strolling in a spring garden.

Chen Feng's eyes casually glanced at the windowsill, and then controlled one herb after another to fly into the Danding.

Outside the window, Master Lu and Master Zhu were looking at Chen Feng with full attention. Their eyes were already round, and they were full of deep surprise and admiration. They were attracted by the stench before, but then they were deeply attracted by Chen Feng's alchemy technique. Whether it was Chen Feng's method of purifying medicinal materials or the control of the heat, they were deeply impressed. Although Chen Feng glanced at them casually just now, letting them understand that Chen Feng already knew that they were peeking outside, but the obsession with alchemy made the two old men rather be a peeping villain than continue to peek.

Time passed minute by minute, and most of the pills floating in front of Chen Feng had disappeared, leaving only a black-purple herb.

"Xuanyin grass. When I first got you, I originally wanted to use you to refine a furnace of 'Xuanyin Pill' to help me break through the Ning Yuan. It's just that it wasn't used by chance. At this moment, as a medicine guide for refining the 'Three Turns Great Returning Pill', it can be regarded as your best destination. Chen Feng thought, with a wave of his hand, the black-purple Xuanyin grass fell into the Danding, and finally turned into a medicinal juice, which merged into the essence of the medicinal juice in the Danding.

With the addition of the Xuanyin herbal juice, the previous group of medicinal juice seemed to have sublimated, the color suddenly brightened, and a wave of energy fluctuation began to permeate the medicinal juice.

At this point, the purification and fusion of medicinal materials have been completed, Chen Feng waved his hand, and the lid of the Red Cloud Danding collapsed, and the earth soul fire burned even more violently.

Chen Feng sat cross-legged on the side, his eyes closed, as if he had entered a state of self-forgetfulness. However, every once in a while, he would punch in a True Yuan to make the flames in the Red Cloud Pill Ding a little more intense.

Master Lu and Master Zhu stared at Chen Feng without blinking, for fear of missing every movement. To say that Chen Feng originally gave them the feeling of respect, at this moment, this respect has been transformed into worship.

All of Chen Feng's movements were so smooth, as if they were an art, which made these two old men fascinated.

Chen Feng constantly controlled the heat of the Red Cloud Danding, and in the blink of an eye, more than an hour passed.

Suddenly, there was a "boom" in the Red Cloud Danding, and the sound was very loud. Master Lu and Master Zhu trembled in their hearts: "This huge noise, is it a failure?" However, seeing that Chen Feng was still unhurried, the two of them immediately relaxed.

The next moment, Chen Feng slammed his hand. This hand-to-hand duel between the two masters knew each other, and it was the hand-to-hand duel that Chen Feng had received when he received the Erjin Dan before. It seems that this alchemy did not fail.

With a "hum-" sound, the lid of the Red Cloud Danding suddenly opened, and seven black-brown pills shot out, and a medicinal fragrance spread. Just a slight smell, the two masters were shocked in their hearts. What kind of elixir is this, just a slight smell of it makes their cultivation feel like they are improving.

These seven pills were not as difficult to collect as the best Doge Ergin Pill, and under Chen Feng's decision, the seven pills obediently flew into his palm, dripping and turning.

"The Three Turns of the Great Pill is done! And thanks to the blessing of the earth's soul fire, the grades of these seven pills have all reached the level of the upper grade, and the medicinal power is also more refined!" Chen Feng let out a sigh of relief, his face a little pale. Don't look at him, it is easy to refine, but the true yuan consumed in it is extremely huge.

"I don't know, what level can I be promoted to by these seven 'Three Turns Great Returning Pill'. Chen Feng carefully packed the seven pills into a jade bottle. Then, he raised his head and saw that Shen Chen was still comprehending, so he walked out of the alchemy room slowly.

"Congratulations to Master Chen for practicing Qi Dan again. Master Lu and Master Zhu saluted together and said with respectful faces.

"Two masters, don't you know if there is a place for retreat here?" Chen Feng chuckled, and there was no shelf.