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The thirteenth layer of Qi refining, which is the so-called half-step foundation building realm, is really a threshold for all Qi refiners.

It is said that it is the threshold, mainly because the thirteenth layer of qi refining basically transforms the physical body to the limit of spiritual transformation, that is, it is necessary to basically spiritualize the whole body from the inside to the outside.

It can also be said that the accumulation of quantity has reached the extreme, that is, if there is a qualitative change in one step behind Zuihou, you can make a breakthrough in foundation building.

But it is not easy to grasp this degree, while accumulating the innate spiritual power in the body, and not allowing yourself to suddenly start building a foundation when you are completely unprepared.

In fact, the original thirteenth layer of qi refining had a more troublesome problem for qi refiners, that is, to exclude the previous spiritual evil things from the body.

Because when they reached the thirteenth layer of qi refining, the qi refiner had basically spiritualized their physical bodies, so that their physical bodies would not flow out of their spiritual power.

At this time, these spiritual evil things condensed on the surface of the body have instead become an obstacle for the Qi Refiner to transform into the flesh.

However, when an ordinary Qi Refiner was refining Qi at the tenth level, it was easy for him to absorb the spiritual evil thing into the surface of his body, and after several years, or even decades, these spiritual evil things were almost completely fused with the physical body.

Therefore, when it comes to the thirteenth layer of qi refining, it is necessary to peel them out carefully. But it is also an extremely delicate and painful thing.

Of course, this process is actually a subtle control process of the body. Through this operation, the Qi Refiner will be able to exert more subtle control over his physical body.

But different spirits. They also have different attributes, and it was not easy to condense them into the body at the beginning, but now it is even more difficult to remove them.

Fortunately, this was not a big problem for Zhu Lingwu, it was not a stroke of effort, and the rest of the soil could automatically break away from the surface of his body and turn into a lump of colloidal body like clay.

But even so, it took Zhu Lingwu almost five years. It can be regarded as crossing the threshold and truly stepping into the thirteenth layer of qi refining.

Next, for all Qi Refiners, the most critical step, that is, to break away from the mortal body and enter the foundation of the Immortal Gate, also appeared in front of Zhu Lingwu's eyes.

For this, Zhu Lingwu really has an intuitive feeling.

Qi refining has reached the realm of the thirteenth layer of qi refining, and the spiritualization degree of Zhu Lingwu's whole body has indeed reached an extremely high level, and it can be said that Zhu Lingwu can start a breakthrough in foundation building at any time.

For Zhu Lingwu. Building the foundation, it is like a quaint bronze portal that falls from the endless sky and is engraved with an ethereal fairyland.

With his hand, he could already touch this portal that blocked the path of immortals and mortals. Feel free to push this portal at any time.

It's just that this quaint bronze portal not only makes people look forward to it, but it also makes people faintly feel a hidden terrorist threat.

It was as if ten thousand catties of gunpowder were buried in the portal. When you push the door, it explodes. Blow up your bones and scatter your soul.

Indeed it is. Since Zhu Lingwu broke through the thirteenth layer of qi refining, he felt the critical point of qualitative change leading to the foundation building, but he still didn't dare to touch this critical point easily.

He even hesitated, apprehensive, and hesitated about building the foundation!

Refining qi to build a foundation, this represents a rebirth, a step from mortal to immortal, it is also a step to step out of the cliff, one step away, maybe you fail to enter the immortal gate, but will fall off the cliff and fall yourself to pieces.

For qi refiners, the original process of refining qi was just to nourish the body little by little with innate spiritual power like water and sand, which was naturally not dangerous.

But when the foundation is built, it is necessary to explode the accumulation of quantitative changes in an instant, and in order to turn the mortal nature of the physical body into an acquired spirit body, it is necessary to completely destroy the physical body and recast it again.

The danger in it is self-evident, this is completely different from the previous refining of the body by Zhu Lingwu taking the Six Yang Replenishing Heaven Treasure Pill.

Relatively speaking, Zhu Lingwu's previous experience was only like the tide crashing on the shore, and when it really came to build the foundation, it would be as dangerous as using spiritual power as a nuclear raw material and directly causing a nuclear reaction in the body.

Speaking of several realm ascensions on the road of cultivating immortals, they actually have to face a test of life and death.

Whether it is refining qi to building a foundation, building a foundation to knotting Dan, or breaking the Dan into a baby, or even Zuihou's calamity and ascension, it is all dancing on the tip of the knife, a step of immortal path, and a step of ghost path.

It can be said that the deeper the cultivation, the greater the life and death test to face when breaking through the realm, and the higher the realm, the deeper the understanding of the cruelty of the immortal path.

This can be regarded as the price necessary for the monk to break through the mandate of heaven and seek a free and immortal immortal position.

Otherwise, you can only become a mortal in the rolling red dust, at the mercy of fate in the darkness of the Heavenly Dao, the reincarnation of the world bears the suffering of life, until the heaven and earth collapse, shijie dies.

In this respect, the higher the level of a monk, the more ruthless he seems, but in fact it is normal.

Imagine that in the face of realm breakthroughs like suicide again and again, in order to become an immortal, even your own life can be risked, how much affection can you have for outsiders?

In addition, in the long life of the monks, at least ninety percent of the time was spent in retreat, and there were a few who could still retain the emotions of ordinary people when they arrived in Zuihou.

If you are withdrawn for a long time, you are afraid that you will forget your feelings, and if you are ruthless for a long time, you will be really ruthless.

So when he arrived at this state close to building the foundation, Zhu Lingwu's heart was also full of miscellaneous thoughts, as if there were countless voices croaking, the immortal road was long, is this really the path you want to choose?

There are three thousand avenues, so why bother to take this cliff alone.

This kind of mood can't be expressed to outsiders, and all kinds of thoughts flashed through Zhu Lingwu's mind, and even Zhu Lingwu couldn't calm down and cultivate.

In fact, this is also the mental test that countless Qi Refiners will face when they come to this point, otherwise there will not be so many Qi Refiners in this world who cannot build a foundation.

After all, in the face of the test of life and death, not everyone can make up their minds and move forward regardless of everything.

But Zhu Lingwu is not an ordinary person after all, his former lich identity has made him die once, he is naturally not afraid of death, he knows all this, in fact, it is also a state of mind disorder.

No matter how sensible he is, it will pop up in his mind before he makes the decision to take a step towards Zuihou.

But as soon as he really started that step, all distractions would be left behind.

It's just that now, Zhu Lingwu really hasn't been sure about building a foundation, so he has to be patient, bear the fluctuations of this state of mind, and continue to accumulate the innate spiritual power in his body, instead of recklessly starting to build a foundation.

Although he now has a Tsukidan in his hand, Zhu Lingwu doesn't want to do something he is not sure of, and he doesn't need to let himself take risks.

Of course, not every Qi Refiner who fails to build a foundation will definitely die, but after a failure, if you want to challenge again, the shadow left in your heart will become a permanent obstacle when you build a foundation next time.

Zhu Lingwu is still waiting for an opportunity, an opportunity to increase his chances of building a foundation...... (To be continued......)