In the dark and cramped room, three inches above Lu Chengfeng's head, it seemed as if a streak of white light suddenly appeared, but it quickly vanished.

He felt as if, in that moment, he was entirely emptied out, a weakness he had never experienced before, yet it was as though an eye had opened three inches above his head, an indescribably wondrous sensation.

But Lu Chengfeng dared not hesitate for even a moment, nor linger, almost instantly beginning the visualization of the Tongyou Sword Seal that condenses sword intent in the Profound Crane Thousand Shadow Sword Technique.

With spiritual will as the pen, essence, qi, and spirit as the ink, and heaven and earth as the talisman paper, using the profound meaning of the Tongyou Sword Technique as the seal, he condensed the unique Tongyou Sword Seal of this technique.

Each secret skill at this barrier would have a special method of breakthrough. The Five Peaks Secret Skill of the Yuncang Sword Sect originated from the Great Five Elements Extinction Divine Light Sword, making its breakthrough secret technique even more exquisite.

To condense the Sword Seal would generally require a vast expenditure of essence, qi, and spirit, with the slightest error causing it to dissipate into the air, leading to instant death.

But after digesting a gift from an Inner Peak Elder, Lu Chengfeng's control over essence, qi, and spirit had become minute and precise. His understanding of the Tongyou Sword Seal had even reached the Sixth Layer.

Each advancement in the Tongyou Sword Seal became increasingly complex, requiring more vast amounts of essence, qi, and spirit, necessitating extremely deep inner strength and even more exquisite external skills.

If a disciple of the Yuncang Sword Sect could condense the Sword Seal within three breaths, it would show profound depth and extraordinary talent, as is the case with the three elites of the sect.

If it took more than three breaths, the success rate of condensing the Sword Seal would drop sharply, becoming more dangerous with each passing breath.

Once it reached six breaths, it was nearly impossible to succeed in breaking through, leaving hope very slim.

If no guardian was there to promptly interrupt the breakthrough, and if carelessly extended to nine breaths, one would die on the spot without exception.

But as Lu Chengfeng's essence, qi, and spirit burst out from the Baihui point atop his head, the spiritual will almost instantly completed the drawing of the Tongyou Sword Seal. He even had enough strength left to depict both the Second and Third Layers in one breath.

Seeing that only a trace of essence, qi, and spirit remained, if it were anyone else without such fine control over their essence, qi, and spirit, this scant amount would immediately cause them to faint.

But Lu Chengfeng united mind and spirit, using the last trace of essence, qi, and spirit to lift the Tongyou Sword Seal and then embed it into his crown.

All this happened within the span of a single breath. The entire process was seamless, without any incidents or crises.

At this moment, Lu Chengfeng carefully sensed the Spirit Platform at the center of his brow, where he saw a Sword Seal suspended, faintly glowing with a dim light.

He couldn't help but breathe a sigh of relief as this Tongyou Sword Seal became the bearer of the Tongyou Sword Intent, essentially the foundation of the sword intent. With the Sword Seal entering the body, the sword intent was formed, making this breakthrough remarkably smooth.

Lu Chengfeng meticulously perceived the Sword Seal and felt that the full twenty-one layers of the Profound Crane Thousand Shadow Sword Technique's profoundness were practically condensed into that small three-inch talisman.

The intricacies of the Inner Cultivation Heart Method, Sword Technique, and Body Technique were all intact, akin to a work of divine craftsmanship and miraculous creation.

Moreover, the talisman vaguely took the shape of a sword, and though its edge was restrained, showing no extraordinary quality, Lu Chengfeng sensed that with a sword in hand and the Sword Seal's support, slicing through gold and cutting iron would be effortless.

So-called Sword Seal, akin to something between reality and void, is essentially the condensation of essence, qi, and spirit, baptized by heaven and earth, fused with the sword technique's profound meaning, unlike the Profound Crane's imaginary fantasies.

However, the Sword Seal itself had no substance, yet with True Qi's support, it could slash out a ten-foot Sword Qi to obliterate everything with ease.

Thinking of this, Lu Chengfeng gently circulated his inner strength, with essence, qi, flowing through his limbs and bones along the cultivation technique, gathering at the Spirit Platform, and transforming into a drop of crystal-clear liquid after being refined by the Sword Seal.

This was True Qi; only with True Qi could it emerge from the body, and only by using it as a sword could more dreadful Sword Qi be unleashed.

Yet Lu Chengfeng only dabbled briefly before stopping the cultivation technique, having just broken through the Sword Intent Barrier and condensed the Sword Seal, depleting a vast amount of essence, qi, and spirit, leaving him exceedingly empty within.

Should anyone observe his complexion now, they would notice Lu Chengfeng pale-faced and thin, as if his body had been drained by a woman, his Yang Qi exhausted.

Continued cultivation and refinement of essence, qi, would only harm his roots and potentially shorten his lifespan, which was not the right path.

At this moment, Lu Chengfeng's tension slightly eased, having condensed three layers of the Tongyou Sword Seal in one go. He was extremely fatigued and soon felt his mind clouding before falling into slumber.

Once martial arts skills reach the Nineteenth Layer or higher, condensing the true intent of the Martial Path, each incremental advancement requires rich foundational accumulation, to project the Sword Seal outside the body to be refined by heaven and earth, and inscribe more of the martial arts profoundness into it.

Although not as perilous as the initial condensation of sword intent, each breakthrough still contains significant danger.

Without fully comprehending the profundities of martial arts, further advancing in inner power cultivation, and honing essence, qi, and spirit to a rounded state, one must not recklessly break through.

Especially since each advancement requires a geometric increase in essence, qi, and spirit, making inner power cultivation increasingly vital, and the resources required will increase dramatically.

Although Lu Chengfeng had comprehended the Tongyou Sword Seal to the Sixth Layer, his own foundation was utterly insufficient to support condensing a Sixth Layer talisman, with merely the Third Layer already having depleted his reserves.

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