According to the "Budan Sutra", the firewood required for this alchemy is not ordinary firewood, but must be some wood nourished by spiritual energy, otherwise the medicinal properties of the refined pill will be greatly reduced.

Of course, Li Yuan had already prepared for this, and he had already cut down a few hundred-year-old trees next to Old Man Hong's spiritual field and split them into firewood.

Although these old trees are not spiritual trees, they have grown on the edge of the spiritual field for many years, and have become full of spirituality due to the influence of spiritual flowers and spiritual grasses, and they are very suitable for firewood.

After putting the firewood away, Li Yuan directly asked Dong Fatzi to ignite the furnace fire with a fire bomb technique, and then began to start alchemy according to the alchemy steps in the "Budan Sutra".

After waiting for the firewood to burn for a while, Li Yuan put the yellow grain grass, lotus seeds, and mountain deer into the furnace in turn, and gradually added some auxiliary materials, and then began to use mana to control the fire.

After about ten minutes, these spirit grasses gradually dissolved in the flames, melting into drops of emerald green spiritual liquid essence, and then flowing down the notch into the Ning Dange below.

At this point, the first step of the melt is completed, and the next step is to remove impurities and purify, and then bake the spiritual liquid over low heat, refine the impurities in it, and remove those useless things.

This step is difficult to say, simple and very simple, but the key lies in the observation of the spiritual fluid and the control of the fire, too strong fire will cause too much evaporation of the medicinal substance, and too small fire will lead to incomplete removal of impurities, so that the final refined elixir has too many impurities, and it will become a waste pill or a poisonous pill.

This step is highlighted in the "Budan Sutra", which is said to be an important link related to the quality of the pill, and for this reason, the author of the "Budan Sutra" also deliberately created a unique purification method - centrifugal method.

Maybe it's because of the first alchemy, and he is not very familiar with it, Li Yuan has repeatedly failed in the process of purification, either roasting the spiritual liquid dry, or having a problem with the technique, and throwing the spiritual liquid directly out when he uses mana to control the rotation of the spiritual liquid.

After failing five or six times in a row, Li Yuan gradually found the trick and successfully purified it once.

"Now it's Ning Dan. Looking at the thumb-sized, wriggling spiritual liquid in the furnace, Li Yuan's heart lifted slightly.

This Ning Dan can be said to be the most complicated and difficult step in alchemy, it takes a lot of energy and a long time to become a Dan, and as long as one is not careful, it will be wasted.

Of course, the time to become a pill depends on what kind of pill is refined, as the simplest Bigu Dan, the time required is naturally not too long, but some high-level pills are different, often what is required for seventy-seven forty-nine days, ninety-nine eighty-one days to become a pill, and even some legendary elixirs take dozens of hundreds of years.

Half an hour later, a loud bang came out, waking up the sleeping disciples nearby, and everyone ran out of the room one after another, wanting to see what kind of person was so bold that he dared to attack the Heavenly Master's Mansion at night.

But when they found out that such a big movement was actually caused by Li Yuan's alchemy furnace, they were surprised, and they all showed dissatisfied looks, and some even proposed to complain to the elders.

In order not to cause trouble for himself, Li Yuan had to temporarily give up alchemy, and began to meditate and practice after taking a small reward Qi Gathering Pill, after all, the cultivation of Jinding Divine Skill cannot be left behind.

The Golden Tripod Divine Skill is divided into five layers, after the first layer is practiced, you can reach the peak of Qi refining and begin to cultivate the second layer, and the second layer of refining achievement is the cultivation of the early stage of foundation building, the third layer, and the fourth layer correspond to the middle and late stages of foundation building respectively, and after cultivating to the fifth layer, that is, the last layer, it must be the peak of foundation building, and you can prepare for the Dan.

As for the later cultivation, it is necessary to change to other exercises, because the Jinding Divine Skill does not have a cultivation method for the Jindan period.

Li Yuan has only cultivated to the first level of the Golden Tripod Divine Skill now, and he is not yet complete, and he still needs to spend a lot of effort on cultivation.

In this way, Li Yuan alchemy during the day and cultivation at night, day after day, until a week later, he finally succeeded in refining the first furnace of Bigu Dan, and with the help of the Qi Gathering Pill, his cultivation also improved, reaching the fifth level of Qi refining, and his mana improved a lot.

Looking at the bottle of Bigu Dan in his hand, which was not quite in perfect shape, Li Yuan showed a look of relief.

If he can succeed for the first time, there will definitely be a second time, that is to say, he has almost entered the door for alchemy.

After trying several times in a row, and when the success rate of the pill reached about 70 percent, Li Yuan gradually became comfortable and began to consider refining the more difficult Qi Refining Pill.

The refining of this Qi Refining Pill is different from that of Bigu Dan, it requires more than twice as many elixir materials, and it is basically impossible to buy in the mortal world, and the most important thing is that Li Yuan does not have the Dan of Qi Refining Pill.

However, in the case of having sufficient contributions from the sect, these are not a problem, the Dan Fang of the Qi Refining Pill can be exchanged for only a hundred contributions, and although those elixir materials are not cheap, they can be exchanged after all.

After a little hesitation, Li Yuan made up his mind, and took out nearly half of the contribution in exchange for the pill of the Qi Refining Pill and the required elixir, so far, the contribution of the rewarded master was only more than 300 points.

"Hey, I originally wanted to change to a spirit weapon flying sword, but now I ......" Li Yuan smiled helplessly, and then looked at the dozen bottles of Bigu Dan on the table, and suddenly had an idea.

Although this Bigu Pill is cheap, it has a large sales volume, and if these dozen or so bottles are sold, it will be enough to exchange for four or five copies of the materials for the Qi Refining Pill, and as long as these materials successfully refine a furnace of Qi Refining Pill, then he will not lose money.

Now that he had a plan, Li Yuan no longer hesitated, and while asking Dong Fatzi to find a buyer, he began to prepare for refining the Qi Refining Pill.

......

The ideal is plump, but the reality is always very skinny.

Ten days later, with a muffled sound of "bang", the Dan furnace exploded again.

Looking at the two people who ran out of the disciple's room emitting black smoke, the nearby disciples had long been accustomed to it, and they immediately guessed what was happening inside.

Li Yuan's plan failed, and in the past few days, he had indeed exchanged the spirit stones he had earned from selling Bigu Dan for five more materials for refining Qi Refining Pills, but he underestimated the success rate of Qi Refining Pills.

Unlike Bigu Dan, the refining process of this Qi Refining Pill is too complicated, and it is not easy to purify the eight kinds of elixirs, let alone fuse these spiritual liquids with different medicinal properties together, it is even more difficult than ascending to the sky, after all, it is not very difficult for cultivators with flying spirit weapons to ascend to the sky.

Due to the failure of the plan, Li Yuan returned to the original point again, but there was still something to gain, during this time, he not only had some basic understanding of alchemy, but also familiar with the refining process of the Qi Refining Pill, Li Yuan believed that if he was given another ten and eight parts of the materials, he would definitely be able to successfully refine a furnace of Qi Refining Pill.

"Why don't you go and take over the task of the master's sect?" I remember seeing someone on the task list who posted an alchemy commission, isn't this killing two birds with one stone for you?" Looking at Li Yuan, who was a little discouraged, Dong Fatzi suddenly reminded him.

Dong Fatzi's words were like a thunderbolt in a sunny day, a word woke up the person in the dream, and was reminded by him, Li Yuan finally woke up.

"The merchant's child really thinks differently than we do, and that makes you think of it. With that, Li Yuan took out his mobile phone, opened the Shimen system, and began to inquire about the Shimen's entrustment.

Sure enough, Li Yuan quickly found the alchemy commission that Dong Fatzi said in the task list.

According to the introduction of the task, Li Yuan also learned that what the client wanted to refine was a rare elixir called 'Ning Shen Xiang'.

This condensing incense is a kind of low-level elixir that is not very common, the effect is to ignite it when cultivating, it can calm the mind, make it more focused when cultivating, and it is not easy to be disturbed by external objects, and it is generally used when monks practice some kind of esoteric spell, or when they are enlightened and break through the realm, but because the use of condensing incense is not widespread, few people will refine it.

The commission for refining the incense also states that the materials are prepared by the client himself, and only the person who accepts the commission can guarantee a success rate of at least 50% before accepting the commission.

In addition to refining condensing incense, Li Yuan also saw seven or eight commissions for refining pills, but these commissions all indicated that a senior alchemist was required to be qualified to receive them, so Li Yuan had no choice but to choose the former.

After all, he needs a lot of materials to practice his hands.

......

After receiving the commission from the Deacon Hall, Li Yuan went to a building called 'Fusheng Xiaozhu' in the bamboo forest in the face of the disciple's landlord to meet the mysterious client.