This sword technique is not only a supreme soul sword technique but also contains a powerful soul tempering method.

Three thousand ancient characters.

Obscure and mysterious, like an ancient sword.

Anyone who observes them will be tempered by an unknown force, causing it to grow.

"Huff!"

In less than half an hour.

Chu Feng felt his eyes blur, his mind dizzy, unable to sit steadily.

"Just observing three ancient characters almost exhausted this unknown force! To observe all three thousand characters, who knows how strong a soul is needed!"

He sighed lightly.

No longer observing, he consumed a large amount of pills to replenish himself.

His essence, energy, and spirit circulated and nourished each other.

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The power of his blood and the power of the Heavenly Demon Sword continuously converged like a stream, spreading toward his mind, replenishing the consumption of the unknown force.

This process lasted several hours.

In ancient times.

There were supreme martial artists whose essence, energy, and spirit advanced together, complementing each other.

Every cultivation reached an extreme state, ascending the heavenly path, slaying ancient emperors, mastering the mysteries of heaven and earth, commanding the mountains and rivers!

Like the master of the Heavenly Demon Sword Scripture.

That supreme sword demon who ascended to the pinnacle of all realms, roaring at the sky.

Incredibly powerful, able to regenerate from a drop of blood, and cut through mountains and seas with a single thought!

"I can cultivate again!"

"As long as the unknown force can break through and reach the True Spirit of the first realm of Spirit Refining, condensing the sword heart of the Heavenly Heart Sword Canon shouldn't be difficult!"

"At this moment, I can perceive minutely, clearly sensing the range of about thirty meters. I wonder what level it will reach after transformation!"

Chu Feng muttered to himself.

For several consecutive days, he was crazily cultivating.

Body, blood, and soul, all progressing together.

Buzz!

On this day, Chu Feng opened his eyes.

In his mind, the fifth ancient character glowed, with the unknown force enduring the terrifying pressure, continuously comprehending.

Finally.

With a boom, a rumble sounded in his mind, as if breaking some kind of shackle.

The originally faint and formless unknown force, when impacting the fifth ancient character, suddenly trembled and transformed into a soul body that was invisible yet crystal clear.

"True Spirit!"

Chu Feng's perception moved.

The area within a range of several dozen meters was all imprinted in his mind.

Outside the cave, the battlefield where several fierce beasts were fighting moved to another direction, separated by a forest, but Chu Feng could still perceive it, even capturing their every move clearly!

"This is the True Spirit Realm!"

He felt a surge of joy in his heart!

Forging the True Spirit is the first step in Spirit Refining, not only allowing perception of all directions but also capturing details.

Most importantly, Chu Feng felt that his True Spirit seemed capable of some form of attack.

Silently and swiftly arriving in an instant.

"No wonder, to cultivate the Heavenly Heart Sword Canon, at least the soul power of the True Spirit Realm is needed!" Chu Feng realized that only by reaching the True Spirit Realm is the soul strong enough to barely pose a threat outside the mind.

"Sword Heart!"

He didn't stop, immediately activating the five ancient characters he had thoroughly observed in his mind, beginning to impact the True Spirit.

The True Spirit is formless and intangible.

It can change into countless forms, but it can transform into different shapes according to the martial artist's cultivation.

Some True Spirits are like divine weapons, some like ancient deities, and what the Heavenly Heart Sword Canon requires to forge is the Sword Dao True Spirit! The first layer of the Sword Canon, my heart is the sword heart!

Heart like a sword, then the True Spirit is like a sword!

With a thought, the True Spirit great sword slashes out, annihilating all souls!

Containing great killing potential!

Boom boom boom boom!

The five ancient characters directly impacted the True Spirit, the newly condensed True Spirit was immature, and with each impact, Chu Feng's face turned a shade paler.

He frantically operated the Heavenly Demon Sword Scripture.

Pills, spiritual plants, even without bothering to concoct them into elixirs, he swallowed them directly, instantly refining them into energy, merging into his body, then continuously guiding it to his mind, replenishing the True Spirit!

Boom!

Several hours passed.

Cold sweat dripped from Chu Feng's forehead.

However, the True Spirit, after the thousand temperings of the ancient characters, had now transformed into a sword shape as thick as a thumb.

A flash of sharp sword intent flickered within it.

"Success!" Chu Feng breathed a sigh of relief.

He nurtured himself, then stood up, hissed! As he opened and closed his eyes, sword light burst forth.

This was not just ordinary sword light.

Zing!

The sword light flashed, piercing through a distant boulder silently and eerily!

"What powerful might!"

"It's no weaker than the power unleashed by a second-grade sword technique! Moreover, with a thought, the sword light arrives, the physical body cannot block it, penetrating the soul! Unexpectedly, it really is possible to counter-kill someone in the Qi Transformation Realm!"

Chu Feng exclaimed in amazement.

And this was just the newly condensed Sword Dao True Spirit.

If the True Spirit grows stronger, continuously transforming and evolving, how powerful will the displayed might be?

It is said.

In ancient times, there were Spirit Refining experts who could annihilate a nation with just a glance!

Looking at it this way, cultivating the soul to the extreme might indeed reach such a level.

"And this is not the end!"

Chu Feng closed his eyes, his body bursting with crackling sounds.

His blood surged, the power of the Heavenly Demon Sword flowed like a river.

Eighth Layer of the Hundred Refinements!

His realm increased, after days of arduous cultivation, continuously consuming and replenishing, he finally broke through the shackles, advancing his cultivation once again!

"Nearly twenty thousand pounds of force!" Chu Feng sensed himself.

Such power was enough to rival the prodigies who had just entered the Qi Transformation Realm! With the blessing of essence, energy, and spirit, it forcibly pushed his strength to such a level with the cultivation of the Eighth Layer of the Hundred Refinements!

"It's time to leave, the battle of those fierce beasts is almost over!"

Chu Feng nodded in satisfaction, punched and shattered the boulder blocking the cave entrance, and strode out!