In the stone room of the Xuanyu Cave Mansion, Liu Yu sat on the white jade futon, his eyes were closed, he held a strange magic seal in both hands, and a pitch-black oval jade filled with faint gray smoke floated in the air above his head.

An hour later, the pitch-black oval jade floating in the air had faded into a gray-brown gray dark stone, and with a crack of "touch", the stone was broken into several pieces and scattered on the stone bed, Liu Yu frowned and slowly opened his eyes, looking very unwilling.

After a few breaths, I saw Liu Yu's hands quickly transform, and a thick black smoke poured out from Liu Yu's nose, floating in the air and gathering into a cloud of pitch-black qi, which was actually an extremely rich "yin qi".

Liu Yu got off the stone bed, quickly came to the side of the talisman table and sat down, took out the "Qingfeng talisman pen", spread a four-grade "Huai Pi talisman paper", dipped it in the pre-prepared talisman liquid, and began to draw the four-grade spirit talisman "Yin Wind Thorn".

With the completion of the last painting, a complete spell composed of forty-five basic runes, five "Qi Blade" high-level runes and six "Yin Eclipse" core runes has jumped on the Huaipi rune paper, and only the last step is missing, "Soul Infusion".

Liu Yu put down the "Qingfeng Rune Pen", held the seal in his left hand and pointed to the "Huai Pi Fu Paper" spread on the desktop, and his right hand became a claw, ingesting the pitch-black qi cloud that was imprisoned by mana and floating in the air, only to see that the qi cloud separated wisps of black smoke, which continued to pour into the "Huai Pi Fu Paper" like a stream.

When the last wisp of "Yin Qi" was injected into the Huai Skin Talisman that had shrunk to the size of a palm, Liu Yu couldn't help but show a satisfied smile, this "Yin Wind Thorn" talisman was completed.

This "Yin Wind Thorn" is a special four-grade spirit rune recorded in the animal skin talisman book obtained by Liu Yu from Shifeng Cave Mansion, which is extremely difficult to draw, and Liu Yu's current rune rate is less than three percent, and it is not easy for this one to be successful.

This "Yin Wind Thorn" is not only difficult to draw, the runes and runes are cumbersome, but the last step of the spirit injection is not the commonly used five elements of aura, but the cold "first yin erosion qi", which is very special.

This talisman is very powerful, with the effect of breaking the law, for spell defense, such as air shield, air cover has a strong restraint power, for armor defense, such as all kinds of magic weapon shield, magic clothes, and a certain corrosive effect, very vicious.

Liu Yu put the drawn "Yin Wind Thorn" talisman into the storage bag, got up and came to the stone bed to clean up the rubble scattered on it, the pitch-black oval jade was a high-grade "Yin Stone", which was a special ore containing a large amount of "Yin Qi" like the currency "Spirit Stone" circulating in the Xiuzhen Realm.

This kind of "Yin Stone" is produced in a place where Yin Qi is strong, it is very rare, and the price is not cheap, the price of a high-grade "Yin Stone" has reached six hundred low-grade spirit stones, which is more expensive than a five-element intermediate spirit stone, in addition to being used for evil cultivation to cultivate and improve, it also has a lot of use in the righteous path cultivation realm.

For example, when refining weapons, you can put in "Yin Stone" to increase the power of earth fire, or it can be directly used as a kind of refining spiritual material to increase the characteristics and power of magic weapons, such as "breaking the law", "corrosion", etc., in addition, some special poison pills and spiritual liquids are often filled with Yin Stone powder to act as auxiliary spiritual materials.

Even some physical cultivators will use the cold "primal yin erosion qi" in the yin stone to corrode their own meridians and flesh, and use special cultivation methods of self-harm to improve the strength of the body and enhance their self-healing ability.

Therefore, it is not uncommon to say that "Yin Stone" is not uncommon in the cultivation world, and it is not forbidden to circulate, but it is very difficult to mine "Yin Stone", the origin is special, and the output has always been scarce.

Liu Yu's acquisition of these high-grade "Yin Stones" was not to draw the "Yin Wind Thorn" talisman at first, but to cultivate the "Heavenly Master Mantra Dao Soul Heart Sutra", and to cultivate this Heart Sutra, it was necessary to use the "Yin Stone" to ingest the pure "Initial Yin Eclipse Qi" in it.

Through a special mental method, the original Yuan Qi of oneself, that is, the endless trace of "Chu Yang Yuan Qi" contained in the bodies of thousands of living beings, and the ingested "First Yin Eclipse Qi", the two are combined into one, and transformed into a special Dao Soul True Qi, and the Dao Soul True Qi is used to nurture the "Born Soul" in the Mud Palace Cave, so as to achieve the effect of strengthening the "Born Soul".

You must know that the "living soul" is the source of living souls, and the "living soul" is infinitely useful for its growth, and its many benefits are extremely important to cultivators. The most obvious thing is the growth of spiritual awareness, and the control of the cultivation of exercises, spell casting, drawing talismans, and so on is naturally enhanced.

And the most critical point is that the "living soul" grows, and the soul body is condensed and heavy, so it can resist stronger attacks, which has extremely significant benefits for the promotion of the subsequent tribulations.

It can be seen that the "living soul" is essential, the "living soul" lives in the mud palace cave, extremely fragile, and the cultivation of the five elements of spiritual energy between heaven and earth is ineffective for it, for many years, countless ancestors and wise men have exhausted all means to try to quickly expand their own "living soul", but few have succeeded.

Although the exercises to strengthen the soul in the cultivation world are rare, they are not nothing, and each one is the mastery of each sect, but like the "Heavenly Master Mantra and Dao Soul Heart Sutra", the mental method that can strengthen the soul during the foundation building period can be described as ingenious, and even unique.

Other rare exercises that strengthen the soul have extremely strict requirements for the cultivator's own cultivation, and most of them can only be cultivated when they reach the Jindan stage, or even the spirit infant stage, such as Haoran Gate's Tianpin Exercise "Haoran Shujing Zhuang Meng", which requires the cultivator to reach the middle stage of Jindan cultivation before he can cultivate.

"Hey!" Liu Yu sat at the stone table in the front hall of the cave, frowned, sighed deeply, and put down the teacup in his hand.

Although this "Heavenly Master's Mantra Dao Soul Heart Sutra" is ingenious and extremely mysterious, and can be cultivated during the foundation building period, there is still a lot of demand for the cultivator's own Dao talent. And Liu Yu is obviously not an outstanding person, and he has been practicing this exercise for nearly three years, but he has never been able to get started.

In the past three years, although Liu Yu has penetrated and is familiar with the flow of the veins of this exercise, and has also understood the essence of the true element transformation of this method, he just cannot combine the "early yang yuan qi" in his body with the "first yin erosion qi" ingested from the yin stone into one, and transform the "true qi of the dao soul".

"It is to improve one's own cultivation first, let go of this Heart Sutra, and then try again. It is better to slow down one's own cultivation first, and use the special secret technique recorded in the "Silver Secret Scroll" to transform the "Dao Soul True Qi" first. Liu Yu stared at the red jade teacup in his hand and fell into deep thought.

It is clearly stated in the "Silver Secret Scroll" that if you have practiced the "Heavenly Master Mantra and Dao Soul Heart Sutra" for three or five years, and have not yet started, you are not very talented. Fortunately, there is a special secret technique recorded in the secret scroll, which is used to assist those with dull talent to cultivate this Heart Sutra.

This special secret technique is called "Gangsha Taiji Transformation Yuan Technique", which requires taking a wisp of innate "Initial Yin Evil Qi" and a congenital "Beginning Yang Gang Qi", and using the mental method of "Heavenly Master's Mantra and Dao Soul Heart Sutra" to transform them into "Dao Soul True Qi".

This transformation process is relatively easy, the need for Dao talent is not high, as long as it is not too dull, it can be easily completed, if this method, still fail to transform the "Dao Soul True Qi", it is stupid, not only with this exercise, but also without the Great Dao, no longer need to do penance, you can go home early to enjoy the rest of the year, so as not to waste your life.

After a cultivator refines the "Dao Soul True Qi" with the "Gangsha Taiji Transformation Yuan Technique", he can carefully observe and scrutinize the origin of the true qi, draw inferences from one example, and then combine the two with the "Primal Yang Yuan Qi" and "Initial Yin Erosion Qi" to transform the Dao Soul True Qi, and then he can get twice the result with half the effort, practice diligently, and the exercises will soon be refined.

If you do this and have not been able to transform the "Dao Soul True Qi", you will still have the same sentence, you will have nothing to do with this exercise, you will not have a chance with the Great Dao, and you should go home early to enjoy yourself.

The "Initial Yin Evil Qi" and "Initial Yang Gang Qi" mentioned in the "Gangsha Taiji Transformation Yuan Technique" are two kinds of innate true qi, both of which are not ordinary, and although there are many sources, it is not easy to obtain them.

After Liu Yu inquired, the easiest way to obtain this "Chu Yang Gang Qi" was to buy a six-grade spiritual material "Gang Yuan Ginseng", this spiritual material is a high-grade ginseng, and its body contains "Chu Yang Gang Qi", which is extremely rare, and the Eastern Yuan Realm has become extinct, and it is only produced in the secret realm above the Xuan Pin.

"Gangyuan ginseng" is the main medicinal material of a variety of high-grade elixirs, the price is extremely expensive, Liu Yu asked Baixinglin, a qualified "Gangyuan ginseng" of the year, the price is 3,600 intermediate spirit stones, and the exchange for low-grade spirit stones is as high as 1.8 million pieces, which is staggering.

Liu Yu served as the "Fu Blood Deacon" in the Holy Rune Hall, plus the income of the Jade Rune Building, the total monthly income was about 35,000 low-level spirit stones, and after a year, he bought pills to maintain daily cultivation and practice the consumption of new high-level spirit runes, plus the rations of the "Jade Snake", there were not a few spirit stones left.

If he wanted to buy a "Gangyuan ginseng", Liu Yu could only suspend the purchase of "Golden Cherry Pill" and "Wuchen Pill" to cultivate and improve his cultivation, and save some on weekdays, it would take almost five years to make up this spirit stone.

This "Gangyuan ginseng" is too expensive, but it is too stupid to put the "Heavenly Master Mantra Dao Soul Heart Sutra" and not practice the anti-heaven exercise, which makes Liu Yu very entangled.

And even if you buy this "Gangyuan ginseng", it is difficult to obtain another innate true qi "Chu Yin Evil Qi", although the source of "Chu Yin Evil Qi", Liu Yu has inquired about some eyebrows, but Liu Yu is not sure whether the news he heard is true or false, and he needs to be more determined.

In addition, even if the news he heard was true, it would be extremely difficult to obtain this "First Yin Evil Qi", which made Liu Yu very headache. Liu Yu wondered if he should improve his cultivation first, and then try to cultivate the "Heavenly Master Mantra Dao Soul Heart Sutra" in a few years.

But Liu Yu felt that it was inappropriate, and it was clearly pointed out in the "Silver Secret Scroll" that cultivating this exercise requires good talent, and he has practiced for many years and has not yet gotten started, which is obviously a lack of talent.

"Senior brother, what are you thinking!" When Liu Yu was entangled and distressed and fell into contemplation, Tang Zhi returned to the cave mansion, and saw Liu Yu frowning, but he didn't notice that she had entered the cave mansion, thinking that she was thinking about something, so he asked.

"Oh, it's nothing! It's junior sister, today, why did you come back so early?" Liu Yu woke up when he heard this, and saw that it was Tang Zhi who came, and it was only a day before it was a day, and Tang Zhi should be an assistant teacher in the Chuyuan Hall at this moment on weekdays, why did he return at this time, Liu Yu couldn't help asking.

"Little sister, I asked the sect for some time off today. After Tang Zhi sat down, he said lightly.

"What's going on, can you use senior brother to help?" Liu Yu saw that Tang Zhi had a strange expression, and he didn't have his usual laughter, obviously something was wrong, so he asked.