Su Chen flipped through the spirit essence book he bought from the night market.

In this spiritual essence book, there is a detailed description of the spiritual essence classification and grade division of immortal cultivators in the Qi refining period.

The spiritual marrow of the Qi refining period is the first small piece of spiritual bone marrow on the neck and spine of the immortal cultivator during the Qi refining period, which is used to transform the spiritual energy of heaven and earth into the vitality that the immortal cultivator's primordial spirit can absorb, and infuse it into the Mud Pill Palace.

The most common ones are the five elements of gold, wood, water, fire, and earth, as well as the slightly rarer ice, wind, and thunder. The essence may be a monophyletic attribute or a multiphyletic attribute.

There are even rarer rare spiritual essences, but it is rare to see one among the thousand immortal cultivators. It's not that the rare spirit essence is powerful, but the effect is special and incredible.

Whether the spirit essence is strong or not mainly depends on its grade, which is roughly divided into upper, middle and lower grades.

If it is divided finely, then it is between one point and one hundred points.

From one to nine o'clock, it is not among the inferior products, and belongs to the spiritual essence of the crippled products. If you are lucky, you may be able to become a Qi Refining Stage cultivator, but in this life, you will only wander in the first and second layers of the Qi Refining Period, and you will not even be able to achieve the middle stage of Qi Refining.

From ten o'clock to twenty-nine o'clock, it is the essence of the lower grade. Poorly, the hope of this life is to survive among the monks in the middle stage of Qi refining.

From thirty to fifty-nine o'clock, they are all medium-grade spiritual essence. Whether you can survive or not depends on the opportunity of desperate and first-line immortal cultivation.

Sixty to seventy-nine o'clock is the top grade. Immortal cultivators with top-grade spiritual essence can cultivate faster, and under normal circumstances, they can cultivate to the late stage of qi refining. As for whether the foundation can be built, it depends on chance.

And more than eighty points is the best, which is very rare among immortal cultivators. In the entire Chaoge Immortal City, there may not be one among the generation of immortal cultivators, it is a normal thing.

The grade of the spiritual essence directly limits the efficiency of the immortal cultivator's transformation of the spiritual energy, so it is also called the spiritual essence bottleneck.

Immortal cultivators with the best spiritual essence, even if it is the Qi refining period, the five great immortal sects of Shenzhou will be directly included as official disciples.

This is only the first spiritual essence of an immortal cultivator in the Qi refining period.

After becoming a foundation building monk, the second spinal cord of the cervical vertebra will also break through and become the spiritual marrow... The higher the level of immortal cultivators, the more the spine becomes spiritual essence.

There is an ancient legend in the world of cultivating immortals, it is said that reaching the realm of flying immortals, the thirty-three vertebrae of a whole spine can be turned into spiritual essence together, which is incredibly powerful.

Lu Fuzi told Su Chen before that the spiritual essence is divided into upper, middle and lower grades, which is too general and rough. Maybe he saw that Su Chen's spiritual essence was of medium grade, so he didn't say much about it.

The identification of the potential of the spiritual essence requires special identification of spiritual skills to be identified.

If there is no method of identification, there is also a simple way to know whether the grade of your spiritual essence is good or bad. That is, depending on how many bowls of spiritual rice you can eat, whether the absorption efficiency is high, and you will immediately know the quality of the spiritual essence.

Qi refining period cultivators, starting with thirty points of spiritual essence, can digest one or two spiritual grains of a bowl of spiritual rice cooked in a day.

After that, every time you raise five points of spiritual essence, you can absorb the aura of one more bowl of spiritual rice. The pot-bellied man with three meals a day and seven bowls of spiritual rice, the spiritual essence qualification is above 60 points, and he is the top grade spiritual essence.

If you want to change the potential of the spiritual essence, the only way is to take the Purifying Pill.

It is a secret method researched by ancient immortal cultivators, refining the spiritual herbs of the deep mountains, washing the marrow and refining the bones, which has the effect of initiation and can change the bottleneck of the spiritual essence of the monks.

...

After reading the book of spiritual essence, Su Chen was very surprised, and generally understood the situation of spiritual essence.

"It turns out that the cultivators in the Qi refining period only have one spiritual essence! After building the foundation, they will also transform into a second spiritual essence.... If the thirty-three roots of an entire spine are turned into spiritual essence, how powerful it is! I am afraid that between swallowing and spitting, the spiritual energy like Taotao River can be turned into vitality in an instant. ”

Su Chen was amazed.

He sat cross-legged, meditated for a short moment to adjust his state, and then opened his mouth to swallow this golden and crystal clear marrow cleansing pill.

Not long after, the marrow cleansing pill melted into a golden liquid power in the abdomen, flowing in the body, and finally completely adsorbed on the first vertebral column of the cervical vertebrae, revealing the spiritual essence.

Only then did Su Chen see clearly.

This root is the spiritual essence of the Qi refining period cultivator, and it is also the only spiritual essence at present.

He is the single spirit of the wood line.

Within this spiritual marrow, under the surging medicinal power of the marrow cleansing pill, it began to remove the impurities in the spiritual marrow and improve its efficiency of absorbing and transforming spiritual energy.

The process of washing the marrow is quite uncomfortable.

Like ten thousand ants devouring bones, biting little by little to remove the impurities in the spiritual marrow, refining it a little purer.

Su Chen closed his eyes and meditated, his whole body was hot and hot, and suddenly he was cold and shivering, cold and hot.

An hour later, the medicinal power of this pill was completely exhausted.

Finally, the marrow washing is over.

Su Chen was already tired and almost deprived, sweating profusely, his clothes were soaked with mud, and a thin layer of dark black scum appeared on the surface of his skin.

That spiritual essence seemed to be a little less impurity, and it was a little cleaner.

Su Chen rested for another half an hour, relieved himself from the marrow, breathed a long sigh of relief, and came out of the bedroom.

Seeing that Su Chen was out of the customs and had just finished cultivating, Anu was covered in sweat and dirt, and hurriedly burned a large wooden basin of hot water.

Su Chen hurriedly boiled hot water and took a bath in a wooden basin, cleaned the dirt on his body, and changed into a clean and refreshing shirt.

Then, he began to eat dinner, a meal of Linggu rice.

Su Chen ate very slowly, chewing and swallowing slowly, to see how much his absorption of Linggu had improved after washing the marrow.

It took nearly an hour to finish this dinner and digest it slowly.

His heart was trembling, and he wanted to cry without tears.

Today, he just digested half a bowl of spiritual rice.

This means that he spent nine hundred and fifty spirit stones to buy back a marrow cleansing pill, and the improved spirit essence effect has increased by about two points.

Five points to add a bowl of spiritual rice.

He had to wash the spiritual essence at least two or three times before he could increase the amount of a bowl of spiritual rice.

Obviously, it is not as easy as Lu Fuzi said, and after washing the lower product a few times, it will become a medium grade, or even a top grade.

I accumulated two thousand spirit stones in half a year, and spent half of it to buy this myelin cleansing pill, which only increased by two points.

"Once you enter the marrow, it is as deep as the sea, and this pit is too deep, and it is bottomless!"

Su Chen couldn't hide his sadness.

No wonder the gray-clothed monk was a disciple of the Bi family, but didn't think about using it for himself, but just sold it.

The marrow washing pill is a good thing, but the effect of one marrow washing is not obvious. How many times does this have to be washed before a high-grade spiritual essence of more than sixty points can be washed out?

Su Chen tried to wash the marrow once, but he was a little disappointed, but he was very unwilling.

He tasted the marrow... The improvement effect on the spiritual essence is a little. It has been promoted from a bowl of Linggu to a bowl and a half of Linggu.

But it is impossible for him to give up washing the marrow.

If he didn't wash the marrow, his cultivation speed would be too slow. It would take him thirty or forty years to become a late-stage Qi refining cultivator, which was too slow.

If one myelin cleanser is not good, then two, three... Five... Ten pieces, you can always slowly go up.

Su Chen secretly gritted his teeth and made up his mind.

What he lacks most now is not the Spirit Valley, nor is he too short of Spirit Stones. This spiritual essence bottleneck has severely limited his absorption of spiritual energy, and he must break through this difficulty.

...

In the night market of Chaoge Immortal City, there are no more sellers selling myelin-washing pills.

Su Chen had to come to the largest Lingdan Pavilion in the city again.

If you want to buy the Cleansing Pill again, you can only buy it in the large Spirit Pill Pavilion in Chaoge City.

The largest one in the city is the "Zhou's Dan Pavilion", which has complete goods and sufficient supply of spirit pills during the Qi refining period. Even if there are a few rare elixirs, there are no stocks, and there are channels to purchase them.

"This fellow Daoist, have you made up your mind and ordered a pill of myelin cleansing?"

A shopkeeper of the Zhou family said with a smile.

This is the family property of the Zhou family, and his shopkeeper is naturally also a member of the Zhou family.

Last night, Su Chen had come to his Spirit Pill Pavilion to see it, and he wanted to wash the marrow pill.

But there are too few people who buy the Pulp Cleansing Pill, and there is no stock in the pavilion for the time being, if you want to order, you need to wait for two or three months to buy it from the Five Great Immortal Sects.

Su Chen couldn't wait yesterday and didn't make an order, so he met the gray-clothed monk in the Chaoge Night Market, so he bought a pill directly from him.

"Shopkeeper, can it be cheaper?"

"It's really cheap, this marrow cleansing pill is purchased from the Immortal Sect, and the price of a thousand spirit stones is also set by the five great immortal sects. If we sell one in the Spirit Pill Pavilion, we will only earn the difference in the price of dozens of spirit stones. You pay a deposit of 200 spirit stones first, and I will help you order one back. ”

Zhou's shopkeeper shook his head.

Su Chen was a little difficult to decide.

He has a thousand spirit stones left in his hand, although he earns spirit stones faster, but he also works hard for most of the year, and he sells spirit valleys and elixirs every day.

I bought a pill to wash the myelin, and after a few months of hard work, it was in vain. Buy 10 capsules, and it will be dry in two years.

Inadvertently, Su Chen saw a counter in the corner of the hall displaying several old alchemy jade slips, as well as some elixir prescriptions.

Alchemy!

Su Chen couldn't help but be stunned.

He suddenly thought of something, he didn't necessarily have to buy a ready-made elixir, maybe he could also learn it by himself and practice an alchemy technique.

Whether it's refining the elixir for your own use, or refining the elixir and selling it, it's a good business. The profit of the spirit pill is much higher than that of the spirit valley and the spirit medicine.

"Shopkeeper, show me these alchemy books!"

"This little brother should be a new cultivator in Immortal City, this alchemy book is of little use to you. You don't have any elixir in your hand, you don't have an alchemy furnace, and you haven't learned alchemy from an alchemist... Novices buying this alchemy book are purely a waste of spirit stones. ”

Shopkeeper Zhou smiled and persuaded.

But he still took out the alchemy jade slip from the counter and showed it to Su Chen.

These alchemy jade slips are not precious in themselves.

What is really expensive is the expensive elixir materials that cost tens or hundreds of years to cultivate, as well as the valuable alchemy practical experience passed down from master to apprentice by alchemists. That's not just a casual immortal cultivator, buy a book of alchemy jade slips, and you can become an alchemist.

Su Chen held the alchemy jade slip in his hand, and his mind glanced at it, and some alchemy techniques were recorded in it.

Inside the counter, there are also a few alchemy prescriptions.

Su Chen pondered, and his mind moved.

Anyway, I can use the seeds to grow spiritual herbs by myself.

Alchemy yourself.

Take it yourself.

If you can't finish eating, you can still sell it, and you can earn a lot of spirit stones.

Why don't you learn alchemy on your own?

In this way, the cost of the elixir can be kept to a minimum, and it is estimated that at most two or three percent of the cost can be refined.

It's a great deal!

"I want this alchemy jade slip, as well as these three low-grade elixir formulas of 'Linglu Pill', 'Lingzhi Pill', and 'Qingfeng Jade Ludan'. Shopkeeper, do you have any recipe for washing the myelin pill?"

"This alchemy jade slip is five hundred pieces, and the three low-grade elixir formulas are two hundred spirit stones each. I don't have the formula for the myelin pill here. Very few alchemists would refine this difficult elixir.

However, I know that there is an alchemist in Chaoge Immortal City who has learned the recipe of the Pulp Cleansing Pill. If you want to buy it, I'll help you ask. See if he's willing to sell you the formula, the price is estimated to be a bit high. ”