Mysterious mirror hanging high

On this basis, the [Bitter Crossing Sutra] has several major advantages over ordinary body-refining techniques:

First, ordinary body-building exercises can only be practiced after adulthood, when the human body is basically fully grown. For those who want to live forever, the window period for protecting the way is too long.

The Ku Du Sutra can be practiced from infancy, and children will have a certain ability to protect the path.

Secondly, ordinary body-refining techniques often require specific secret medicines and resources. For example, blood-based body-refining techniques require the blood and flesh of monsters, metal and stone-based body-refining techniques require precious minerals, and plant-based body-refining techniques also require precious spiritual wood...

Even if you want to practice a technique that simply uses spiritual energy to temper your body, you still have to find a spiritual vein with rich spiritual energy before you can practice it!

Therefore, in order to solve this problem, Wanshou Daojun specially changed the Bitter Crossing Sutra into a miscellaneous body-refining technique. No matter what object is used, the Bitter Crossing Sutra can absorb some of the essence from it to forge a precious body...

Even if you just grab a random stone from the ground, as long as you can afford the time, you can squeeze out some physical cultivation!

Third, because it is a mixed-type practice, the Ku Du body cultivated by the Ku Du Sutra is relatively less vulnerable to targeting.

For example, a body tempered by spiritual energy will be greatly suppressed in a place without any spiritual energy; a body fueled by human blood and energy will lose its power greatly when its blood and energy are exhausted; a body tempered by true fire will be restrained by water-based spells; a body made of metal and stone will be naturally defeated by magnetic spells... However, these weaknesses are negligible in the body of Ku Du, which is equivalent to having a "safety net" in any extreme environment.

Of course, this body-building technique is not without flaws.

First of all, because it is a mixed skill, the Ku Du body is very balanced in terms of strength, toughness, recovery ability, speed, etc. To put it bluntly, there is nothing outstanding about it.

Although the entire set of exercises was revised after Wanshou Daojun attained enlightenment, these problems have been improved, but they are still not comparable to those legendary body-refining exercises that have shocked the world and are famous throughout the ages.

Secondly, the body-refining method of the Ku Du Sutra is very different from ordinary body-refining exercises, which means that if you want to switch to other methods in the future, you will not be able to switch and can only go down this path.

Even because the Ku Du treasure body's ability to adapt and maintain a bottom line is too strong, even the path of discarding all the body refining skills and starting over to practice other methods is blocked, because it cannot be completely discarded!

However, Wanshou Daojun later realized this. As his own method of achieving enlightenment, the Ku Du Sutra was naturally the most suitable for him, but it might not be completely suitable for later generations. Therefore, he paid great attention to "leaving blank space" in the subsequent revisions of the Ku Du Sutra, making the Ku Du Sutra an open framework.

Although it is impossible to completely change the practice, one can fill in some of his own characteristics in this open framework according to his own characteristics. There is a lot of room for modification of the practice. If one is a person with extraordinary talent, it may be possible to change it into a [Sutra of Bitterness] that is suitable only for him.

The last and most fatal point is that the speed of practicing the Ku Du Sutra is surprisingly slow compared to normal body-building exercises!

And since most of the natural treasures can help in the practice of the Bitter Crossing Sutra, the limitation is that the efficiency of absorption and conversion is far lower than other corresponding body-refining exercises. The same body-refining medicine, when used to practice the Bitter Crossing Sutra, can only provide about half of its original efficacy.

The above advantages and disadvantages are not enough to make the Bitter Crossing Sutra the first choice of body-building method for immortality cultivators. The most important thing is the core magical power that is born after entering this method -

[Bitter Crossing of Xuan Guang]!

After entering the Ku Du Sutra, the Ku Du treasure body will automatically generate the innate magical power Ku Du Xuan Guang, which is also the only magical power in the entire method.

In fact, the original version of the Ku Du Sutra has many magical powers, but in order to change this practice into an open framework, Wanshou Daojun directly deleted or integrated the rest of the magical powers into the Ku Du Xuan Guang, leaving only this core magical power to facilitate modification by later longevity monks.

This mysterious light has several functions, including body protection, attack, earth escape, and breath control. Normally, the mysterious light can be attached to the body surface to form a protective film, which can effectively weaken the attack.

This mysterious light can be used to injure the enemy, which is the only long-range attack method of the Ku Du treasure body. Its power is mediocre, similar to the power of ordinary spells of the same level. The advantage is that it can be released instantly, and it is very effective against earth and stone defensive spells.

It can also be used as a light of escape, but its flying speed in the air is not fast. Instead, it can turn into earth and rocks when it encounters them. It is a first-class earth escape method in all the heavens and worlds.

Ku Du Xuan Guang can even effectively restrain his aura and isolate his spiritual consciousness. As long as the gap in the realm between the two parties is not too great, it will be difficult to be detected.

Seeing this, Jing Yu suddenly realized that he finally understood the intention of Wanshou Daojun to pass down this "useless" martial art!

Once one has mastered the Ku Du Sutra, the immortal cultivator can immediately rely on the Ku Du Xuan Guang to go deep underground, and then use the Ku Du Xuan Guang to cover himself and suppress his breath. Relying on the characteristic that all things can be used to refine the body, he can survive in the cave until the end of time!

As the realm of body refining increases, the Ku Du Xuan Guang becomes more and more mysterious, and the rock layers it can penetrate become deeper and deeper, making it more difficult for high-level cultivators to discover it. Once the Ku Du treasure body is cultivated to the strength of the Nascent Soul and the God Transformation, where in the world can't he go?

However, this method is really time-consuming... No wonder this Wanshou Daojun stayed in the lower world for tens of millions of years. I'm afraid he didn't have many dealings with the cultivators in that world when he ascended!

This Wanshou Daojun should be the founder of the reclusive lineage in the Changsheng Palace... He is indeed a recluse enough.

Although Jing Yu felt that this technique was very much to his liking, he did not intend to hide underground for tens of millions of years like Wanshou Daojun.

He clearly remembered that when Xuan Qingzi introduced the Xianzhou Realm, he had said that this realm had once experienced a catastrophe that swept across the entire realm, causing the extinction of hundreds of millions of lives and leading to the direct interruption of the immortal civilization in the entire realm... How could he know that it wouldn't happen again in the future?

Although he didn't know what this catastrophe was, he was afraid that a catastrophe that could directly end the immortal civilization could not be avoided by hiding underground.

However, the general principle of safe practice remains unchanged, but you can intervene in the world appropriately while ensuring your own safety.

"Huh? What is this?"

Jing Yu discovered that right after the [Bitter Crossing Sutra], there was a body-building exercise called [Earth and Rock Body].

Jing Yu had seen this technique more than once during the five hundred years in the Hall of Longevity. Most of the time, it was displayed on the first floor of the technique pavilion in the market town or the Immortal City. It could be practiced to the level of great perfection of Qi training. It was usually sold for two or three spirit stones. It was a common item that most sects disdained to collect. After entering the door, the whole body would be covered with a layer of gray luster, which was very similar to the appearance of Ku Du Xuan Guang.

"Nine Life Daojun truly has good intentions!"

Jing Yu almost immediately understood why the Nine-Life Taoist had given him this technique as a gift.

This is so that if I accidentally expose my Ku Du body when I am weak, I will have an explanation!

This made Jing Yu even more curious. A person like Jiu Ming Dao Jun who was so thorough in his work, claimed that one had to enter the mortal world to obtain the martial arts. What kind of technique was that?

----

"It's time to breastfeed the Sixth Prince."

The sturdy palace maid called the wet nurse and fed the baby Jing Yu under her supervision.

"Gudu - Gudu -"

The royal family’s wet nurses always have enough milk, Jing Yu thought.

He silently practiced the [Kudu Sutra] to digest the essence of the milk and forge the Kudu body. Even with this extra consumption, he still burped after a while.

It was said in the Bitter Crossing Sutra that during infancy, breast milk is the supreme medicine for body refinement. Jing Yu ran through the Bitter Crossing Sutra and indeed felt that this still very fragile body had undergone some mysterious changes. It seemed that there had been significant changes compared to the previous moment, and he could clearly feel that the strength of his physical body had increased slightly.

So Jing Yu, who had already eaten and drunk enough, burst into tears again.

Only when he drank milk again did he close his eyes contentedly.

Looking at the wet nurse's pleading eyes, the palace maid steward was silent for a while before speaking:

"Please assign a wet nurse to the Sixth Prince!"