The third step of alchemy can be called refining, and the alchemist needs to use his spiritual power to observe the movement in the Dan furnace at all times, and refine the essence of the three medicinal materials at the appropriate temperature.

When the essence of all the medicinal materials has been extracted, it is time to enter the fourth step of alchemy, fusion.

The first three steps can be completed by ordinary monks, but this fourth step requires the spiritual power of an alchemist.

Not everyone can do alchemy, and many people who want to practice alchemy have gone through the first three steps, and they can't get past the fourth step.

Fusion, as the name suggests, is to fuse the extracted essence of different medicinal materials together, so as to achieve the medicinal properties that the pill should have.

If something goes wrong in this step of fusion, the alchemy will not be able to continue.

Yan Xiao had heard Yinyan mention it before, and her mental power seemed to be good, so her success rate was a few points higher.

Yan smiled and concentrated, and used his spiritual power to promote the three essences in the Dan furnace.

She tried her best to wrap her spiritual power in a circle, wrapping the three essences, and slowly tightening it inward. Attempts are made to achieve the goal of integration.

"Bang-"

Although the sound was not loud, it signaled that Yan Xiao's first alchemy ended in failure.

This failure has long been expected by Yan Xiao.

She didn't expect to succeed the first time.

Those who can succeed at one time are very few geniuses, and most of the successes are the success of summing up lessons from failures again and again, and finally boiling out.

Yan Xiao was not discouraged, she recovered her slightly damaged mental power, and began to carefully recall the feeling of the moment when she failed.

Those herbal essences don't seem to be docile.

Under her strong wrapping and pushing, those essences seemed to have a stronger sense of resistance.

Yan Xiaofu reviewed the experience of his predecessors in the Danjutsu again, and after thinking for a long time, he took out the second medicinal herb and started the second alchemy attempt.

The second, third, and fourth times all failed in the integration process.

Yan Xiao didn't need to remember this time, he seemed to feel something. I saw that she quickly took out the fifth medicinal herb with her hands and feet and began to make the fifth attempt.

In the first three steps, Yan Xiao was already familiar with it, and she practiced smoothly to the fourth step.

If the hard ones don't work, then the soft ones will come.

This is a new conclusion that Yan Xiao has come to after four attempts.

She reached into her spiritual power, but no longer forcibly encircled the essence of the herbs, but dragged them little by little.

She pulled a trace of the first herb essence, slowly mixed in the second herb essence, and then blended in little by little.

Slowly, the first essence was mixed with the second essence.

The collision of medicinal properties caused the two essences of the original light green to turn into a cyan crystal.

Yan Xiao was overjoyed in her heart, but unexpectedly, her mental power fluctuated because of this, "Bang-", she failed again.

Yan Xiao was a little remorseful, but she had already found the technique of fusion, and she wanted to continue immediately, but she remembered the reason for Fang Cai's failure, so she had to sit down obediently and recuperate her mental power.

The sixth time, Yan Xiao didn't dare to be careless. She carefully dragged the essence of the herbs, blending them little by little, and finally, the three essences of the herbs were fused together.

But that's not the final step.

The last two steps, Cheng Dan and Kai Furnace, are also very important, and they must not be sloppy at all.

Even though Yan Xiao had been very careful to control the heat, he still failed many times when Cheng Dan and the furnace was opened.

Finally, on her sixteenth attempt, she had refined a furnace of intact Qi Gathering Pills.

Ten Qi Gathering Pills can be produced in one furnace, although it is not a rare elixir, but Yan Xiao looked at the ten white Flower Qi Gathering Pills in the black Dan furnace, and his heart was still extremely excited.

It is said in the Book of Dan that ordinary monks who practice alchemy for the first time and succeed in the twenty furnaces belong to the normal category.

Yan Xiao thought to herself: It seems that he is not without talent.

After Yan Xiao succeeded, he was not in a hurry to continue practicing, but recorded Fang Cai's success experience in a blank jade tube, and then took out the next medicinal herb without delay.

With the first success, the rest is much smoother.

After refining day and night for nearly a month, Yan Xiao finally finished refining all the two hundred Qi Gathering Pill medicinal materials and fifty Kangning Pill medicinal materials he had bought before.

Excluding the previous sixteen shares, her Cheng Dan rate can reach about 50% to 60%. According to the records in the Dan book, this kind of Dan success rate can be regarded as an upper middle level.

With so many Qi Gathering Pills, Yan Xiao may no longer need to buy pills during the entire Qi Refining Period, and there may be a lot left to sell spirit stones.

Yan Xiao finally knew why those alchemy masters had never lacked spirit stones.

It's a great way to make money.

Yan Xiao thought about it, taking half of the Qi Gathering Pill to sell should be able to earn back the spirit stones she had previously purchased medicinal materials and the Dan Furnace.

She simply entrusted the fifty bottles of Qi Gathering Pill to Nie Fei and asked him to take them to the market to sell.

And he stayed at home and closed up.

Three years may be a long time for mortals, but for monks, it is just a matter of an eye.

In the past three years, Yan Xiao has been in semi-retreat. Since Su Jian Zhenren and Tongchen Zhenren both went into retreat, this huge Guan Qingfeng, except for some miscellaneous disciples, there are only Yan Xiao and Qingyuan Daojun.

Yan Xiao will go to the Qingyuan Daojun place every month to ask for peace, and occasionally take care of some things that have been seen in the two real people's cave mansions.

Over time, the entire Guan Qingfeng people became familiar with Yan Xiao.

On this day, after Yan Xiao ran the Xuanyin Purifying Yang Formula for a long week, he opened his eyes and suddenly smiled.

Just now, she had risen to the tenth level of Qi refining.

After she cultivates to the perfection of Qi refining, she will be able to impact the foundation.

If the tenth level of Qi refining is cultivated to perfection, it will take two or three years if it is fast, and it is not impossible to cultivate it in five or eight years if it is slow.

What's more, Yan Xiao, a physique that is easy to go mad, can't be greedy in terms of cultivation speed.

Now that she is only eighteen years old, she has the realm of ten layers of qi refining, and logically speaking, the possibility of going mad is too great. After all, an eighteen-year-old girl is not yet in an immature state of mind, let alone a person with a time bomb physique.

But fortunately, she has lived for eighteen years in her last life, and she is thirty-six years old in the two lives combined. This state of mind is not as immature as an ordinary eighteen-year-old girl, and the danger of naturally going mad is much smaller.

However, Yan Xiao was still worried about this problem, and she decided to slow down her cultivation speed a little more, and by the way, improve her state of mind.

The best way to solve this problem is to go down the mountain and practice.