Lin Fei's gaze was as sharp as a saber. He stared intently at Liu Yibai.

This was not the first time Lin Fei had heard this term. Martial artists also needed to build their foundation, but it was different from Qi Condensation practitioners. Martial artists build the foundation of their martial arts.

This martial arts foundation was even more difficult than the immortal dao foundation! Even the Nine Profound Sect's founder, who once suppressed the world and was peerlessly brilliant, ultimately failed to build his foundation successfully. This showed how difficult foundation building was!

"Which martial artist in the world doesn't want to build their foundation? However, the difficulty of foundation building is as difficult as ascending to the heavens. Could it be that Elder Liu has a way to build the foundation?" Lin Fei spoke slowly, word by word.

Liu Yibai did not speak. He waved his hand.

"Clang clang."

The broken swords on the Sword Tomb all vibrated. Then they were buried underground.

"Elder Lin, this is where the predecessors of our Hidden Sword Sect buried their swords. Let's not disturb the swords of our predecessors. How about going to my cave dwelling to talk?"

Lin Fei nodded and said, "In that case, I will respectfully comply!"

Lin Fei had no problem becoming a martial arts Grand Master with his perfected saber intent and saber energy.

Even Lin Fei believed that he would not be inferior to the founder of the Nine Profound Sect in the future, but it was the foundation building that Lin Fei had no confidence. After all, even the Nine Profound Sect's founder failed to build his foundation successfully. He didn't know any information about foundation building. He was naturally very interested in Liu Yibai's invitation.

Liu Yibai glanced at the surrounding martial arts masters and spoke calmly, "I ask that today's matter not be spread by the elders present."

Liu Yibai was not afraid that others would know he couldn't handle Lin Fei. It was just that the current situation in Great Chang was unfavorable for martial artists. What he and Lin Fei were going to do was not a trivial matter. The news must not be leaked.

"Elder Liu, rest assured, we understand and will not spread the news!"

The surrounding martial arts masters also responded one after another. At the same time, their hearts gradually settled down. Foundation building was the pursuit of martial arts masters. Even if Lin Fei, the Number One Saber Under Heaven, was strong, so what?

Once Liu Yibai successfully built his foundation. Their Hidden Sword Sect would have been the only Martial Saint in Great Chang for the past three hundred years.

A Martial Saint is a saint in martial arts! Once they achieved the status of a Martial Saint, they would be much stronger than ordinary Foundation Establishment cultivators.

More importantly, martial Saints had a long lifespan. They could protect the Hidden Sword Sect for hundreds of years, allowing the Hidden Sword Sect to remain at its peak and flourish during this time.

Thus, talents would continue to emerge and there would be no fear of the sect's decline. The two hundred and fifty meters of saber energy that Lin Fei had unleashed earlier had shocked the martial arts masters, but they gradually calmed down now.

Their Hidden Sword Sect's Grand Elder Liu Yibai had already achieved sword intent perfection and True Qi perfection. He was now ready to start building his foundation.

Even if Lin Fei were really another founder of the Nine Profound Sect, if the Hidden Sword Sect gave birth to a Martial Saint, there would be no fear of being suppressed for an era.

Everyone left the Sword Tomb one after another. Lin Fei followed Liu Yibai, flying towards his cave dwelling. Soon, the two arrived at Liu Yibai's cave dwelling. This cave dwelling was located on Soaring Skies Peak, which was Liu Yibai's mountain.

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Entering the cave dwelling, Lin Fei saw that the surrounding arrangements were very simple. There was no unnecessary clutter. Everything was practical and minimalist to be able to cultivate.

In such a cave dwelling for thirty years, Lin Fei admitted to himself that he couldn't do it. How strong and determined must one's spirit and will be? It was no coincidence that Liu Yibai achieved sword intent perfection.

The two sat down cross-legged. Liu Yibai was the first to speak, asking, "Elder Lin, do you know the conditions for foundation building in martial arts?"

"Conditions?"

Lin Fei shook his head and said, "I'm not hiding anything from Elder Liu. Nine Profound Sect has never produced a Martial Saint who has built its foundation. Thus, I know nothing about foundation building in martial arts. Please enlighten me, Elder Liu!"

Liu Yibai nodded slightly and said with a smile, "The so-called foundation building, those Qi cultivators say it's like a carp leaping over the dragon's gate, it's the foundation for 'becoming immortal' or 'achieving dao.' It sounds profound and mysterious.

However, in the eyes of us martial artists, foundation building is actually very simple. It's a metamorphosis, allowing our bodies to transform anew. The human body has its limits. This is a natural restriction; we can't infinitely increase our Innate True Qi, nor can our physical bodies be infinitely strengthened.

What should we do when our bodies reach their true limits? That's when we build our foundation! Once the foundation is successfully built, it's equivalent to a different level of life, a sublimation of life.

That's why those Qi cultivators call those who have built their foundation 'True Person.' And we martial artists, after building our foundation, are called Martial Saints, transcending the mundane and becoming holy in martial arts!"

Lin Fei understood. Both Immortal Dao Qi cultivators and martial artists could build their foundation. Although the foundation-building methods were different, in fact, both were the sublimation of life. Otherwise, it would not be possible for one's lifespan to increase significantly upon building their foundation.

It was equivalent to a different level of life. Only in this way could they break free from the original constraints of the human body and continue to enhance their strength.

"Martial arts foundation building requires one to reach their limit. The limit, which we also call perfection, requires three perfections! Physical Body Perfection, True Qi Perfection, and Mental Perfection.

In fact, these three perfections represent the essence, qi, and spirit of the human body, and none can be lacking. True Qi Perfection is when Innate True Qi reaches perfection, which is commonly known as a martial arts Grand Master.

The mind is unfathomable. Martial artists use their will to represent the mind, so martial artists need to comprehend Martial Dao True Intent. Once Martial Dao True Intent reaches perfection, it represents mental perfection.

The last one, physical body perfection, refers to the body. We, martial artists, have been refining the body from the beginning, which, in a sense, is actually laying the foundation for physical body perfection. However, is the ultimate Body Refining, giving birth to inner power, truly the ultimate?

Not necessarily. That is not the ultimate physical body; if we want to build our foundation, we must cultivate the physical body to the extreme and elevate it to the extreme.

And this is actually very difficult. Because physical body perfection is the only one that cannot be achieved solely by the martial artist. It also requires the help of external objects."

"External objects?"

Lin Fei's heart was moved.

"Yes, external objects. All kinds of heavenly materials and earthly treasures, rare birds, exotic beasts, etc. In short, it is about sparing no effort to nourish one's own body to make it reach perfection."

"What characteristics represent physical body perfection?" Lin Fei asked.

Liu Yibai paused for a moment. Then, he said solemnly, word by word: "Skin like a baby, body exuding a unique fragrance, flawless and pure, untainted golden body! This is physical body perfection!

Once the physical body reaches perfection, it is like the legendary Buddha or a holy being. The physical body is impervious to swords and spears, invulnerable to water and fire, unsinkable in water, and immune to all diseases!"

Lin Fei stretched out his hand. His hand had fair and tender skin, but there was still a significant difference compared to a baby's skin.

As for the unique body fragrance, that was even more impossible. Not to mention being impervious to swords and spears, invulnerable to water and fire, and unsinkable in water.

This was almost like a myth. Such a person with this kind of physical body, even without building their foundation, would be free from diseases and live a long life for hundreds of years! Because this represents the limit that a mortal body can reach!

Lin Fei knew that his physical body had reached its limit. No matter how much he practiced hard martial arts or Body Refining techniques, it would be of no use.

Achieve physical body perfection, it was almost impossible for martial artists to do it on their own. External objects were needed.

"Elder Liu, please tell me straight. What kind of heavenly materials and earthly treasures, rare birds, and exotic beasts? How much effect can they have? To truly reach physical body perfection, what exactly is this external object?"

Lin Fei's gaze was fixed on Liu Yibai. He knew that this was the key.