I became the Lord of the Eternal World in Tokyo.

In case the All-Powerful Cauldron explodes halfway through its casting due to a slip of the hand.

While Uesugi Tetsu was lost in thought, out of the corner of his eye, bottles and jars flew out of the wooden box and were arranged in a circle around Nanjo Aimi, some near and some far.

Although the operation was simple, the strength of each spiritual energy thread was far beyond what Uesugi Tetsuya could achieve.

As expected of Nanjo-nee, who comes from the Nanjo family, her mastery of spirit control techniques has probably reached an absurd level.

Forget it, I'll just lie here and relax from now on.

Doing nothing is the best help.

—Since Nanjo-nee helped him open his heart, he might as well take the opportunity to experience the magnificent natural phenomena of the Southern Hemisphere.

Weird.

Uesugi Tetsu used a large amount of prepared calming incense ash from his storage backpack to gather his scattered thoughts into a single bundle.

During the forging of the Wanling Cauldron, he not only had to remain still and persevere, but he also had to be able to perceive and remember everything that Nanjo Ai was doing in his body with the clearest understanding.

From beginning to end, we must pay close attention to every detail, follow up on every step, and implement every key point!

Only in this way can one gain the deepest understanding of the Myriad Spirit Cauldron and master it at the fastest speed.

Silently, Uesugi Tetsu opened thirty Hundred-Eyed Demon Eyes within his body, observing everything that was happening inside without putting any strain on his body.

Nanjo Aimi paused slightly, but quickly returned to normal.

Where is the heart located?

"Left side... Nanjo-nee, you even have to ask about this?"

"Who knows if you've been lying all along? What if you accidentally cut the wrong thing and I have to sew it back up? That would be such a hassle."

Just as Uesugi Tetsu was about to sigh in exasperation, he felt his upper body clothing automatically undone and fall off.

Then, the cold scalpel plunged into the flesh without resistance, abruptly slicing open his entire right chest, revealing the vibrant flesh and shimmering thunder bones.

The tiny amount of complex spiritual energy released just happened to suppress the automatic healing of Uesugi Tetsuya's body.

"hiss……"

"Don't move, and it's best not to make a sound."

Uesugi Tetsu immediately froze, like a stone statue, focusing all his attention on the area around the wound.

Next, Uesugi Tetsu began to "watch" Nanjo Manami cut open her own flesh bit by bit at close range, and then opened the small bottle labeled "Ama-Iwato Ashes".

The dust, a hundred times colder than a scalpel blade, rustled down, bringing a new clue.

【Please note! 】

[“Nanjo Manami” is helping you forge the extremely dangerous Great Yin-Yang Technique, the All-Spirit Cauldron…]

[Your Spirit Control skill proficiency is increasing...]

Uesugi Tetsu, who was focused on everything, did not notice the prompt in time, nor did he see the different color of the four characters "Nanjo Aimi".

It showed a faint black color.

He could only sense Nanjo Manami's incredibly precise and superhumanly agile manipulation of the spiritual scalpel and countless spiritual threads as she dissected his body.

He is a thousand times more skilled than the most skilled surgeon.

Then, feeling one rare and precious material after another come into contact with his flesh, nerves, bones... and then caressing his spirituality and soul, which brings torment to his fickle will.

Or, to put it another way, refined tempering.

A thorough inspection of every part, inside and out.

If there is even the slightest flaw in Uesugi Tetsu's heart, it will be magnified infinitely, causing the forging of the Myriad Spirit Cauldron to fail.

Although she survived thanks to Nanjo Manami's protection, she was no longer destined to learn this great Yin-Yang technique.

Unfortunately not.

Uesugi Tetsu's mind became increasingly refined and powerful through the tempering he received from observation.

In Nanjo Manami's hands, the Spirit Control Technique operated as naturally as the rules of heaven and earth, linking to the materials that had been initially processed.

After establishing a solid foundation, the material undergoes repeated refinement to form a perfect "embryo," which is then shaped into the desired form and further purified...

The exquisitely beautiful trajectory of spiritual energy flow was displayed before Uesugi Tetsu's eyes without reservation, leaving him mesmerized.

From the outside, one would see a stunningly beautiful woman in an office lady uniform lying on the lap of a young man whose right chest has been completely ripped open, yet whose eyes remain fixed on something else.

In mid-air, pieces of faintly glowing materials flew continuously into the blood cave.

The woman's expression was focused and serious, as if she were creating some rare treasure.

It was like some kind of bloody and terrifying cult sacrifice ritual was underway.

—Based on the ash of the Heavenly Rock Cave, with the reverse scale of the Yamata no Orochi as the shell, the hair of the Underworld as the passage connecting the inside and outside, the fragments of the medicine pot harmonize everything, and the tears of the Mermaid King become the starting power…

There was only a pitiful amount of each material.

But even this "little bit" was enough to make Onmyoji who learned of this place rush to grab it.

Let alone ordinary Onmyoji, even demons and gods would normally find it difficult to find one of these items.

In order to catch the last train to invest in Uesugi Tetsu, a rising star with unlimited potential, the powerful figures in the industry willingly bleed money.

The sun sets, the moon rises.

Unbeknownst to either of them, the Myriad Spirit Cauldron had already taken shape as time passed.

Just one step left.

boo.

The copper stopper of the Hungry Ghost Pot was opened again.

The beautiful blood droplets inside floated up and, guided by Nanjo Manami, hovered above Uesugi Tetsuya's chest.

Chi chi chi——

A dim yet pure purple light shone within this sphere, the size of a heart, and roared under the gaze of every hundred-eyed demon eye.

pat.

Drawn by gravity, the blood droplet fell into the roaring engine of the Myriad Spirit Cauldron.

Boom boom boom! ! !

An indescribable tremor resounded in Uesugi Tetsuya's "eyes," and the originally dim purple light soared into the sky, becoming no different from the rising sun.

But then, the entire Wanling Cauldron emitted a mournful wail.

It seemed about to collapse, unable to hold on any longer.

Nanjo Aimi remained unfazed and implanted the pre-prepared prototype of the Zhou Tian Yan Armor into it.

A dark red light shone.

Although insignificant, it perfectly suppressed and healed the impulse of the newly formed Myriad Spirit Cauldron, reducing a massive collapse from the inside out to nothing.

"finished."

Under Nanjo Aimi's gaze, the purplish-black Wanling Cauldron slowly dimmed its light, truly connecting with Uesugi Tetsu's body, and then fell silent and invisible.

It truly transformed into Uesugi Tetsuya's spiritual energy structure and entered a space different from the one where his physical body was located.

Just like the Qi Hai point.

In that instant, feeling the threat of death leave every pore of his body, Uesugi Tetsu immediately opened the number of Hundred Eyes of the Demon to 50.

With the last of his spirits and all his might, he observed the moment when the Myriad Spirit Cauldron merged into himself.

Unbeknownst to Uesugi Tetsuya, a tremendous force amplified the previously blurry scene, making it incredibly detailed.

After that moment ended, Uesugi Tetsu's consciousness automatically plunged into darkness due to the excessive pressure.

Fell asleep.

……

It was the two-foot-tall man who woke up Uesugi Tetsuya.

"Lord Che? Lord Che?"

Another giant wave surged and rolled before our eyes.

But for some reason, Uesugi Tetsuya had absolutely no interest in observing in detail.

After all, whose child is this...?

My child.

He sat up, took a deep breath, and felt an immense, rhythmic surge of power erupting from deep within his right chest.

Like a heartbeat.

With his mind clear, Uesugi Tetsuya was able to begin clearing away the prompts in front of him.

[Having observed Nanjo Manami's practice and application of spirit summoning techniques at close range for an extended period, your understanding of spirit summoning techniques has deepened, and your proficiency has greatly increased!]

[Your skill, Spirit Controlling Skill proficiency +1944! ]

【Spirit Control Technique - Qi (Master 5121/8000)】

An unexpected look of astonishment flashed across Uesugi Tetsuya's eyes.

But it's a pity.

Today's main focus is not on spirit control techniques.

[You have completed the forging of the Great Yin-Yang Technique - Myriad Spirit Cauldron!]

[Due to the high quality of the materials used to forge the All-Spirit Cauldron, its completion rate exceeds 100%! Your Great Yin-Yang Art vessel, the "All-Spirit Cauldron," has been upgraded to the "All-Spirit Furnace Core"!]

The golden "All-Spirit Furnace Core" bursts with brilliance!

[You have obtained the All-Spirit Furnace Core!!!]

[Because of your meticulous observation and experience during the forging process of the All-Spirit Furnace Core, your control over the All-Spirit Furnace Core has greatly improved!]

dong... dong... dong...

In the void, an extremely slow and heavy pulsation echoed continuously through Uesugi Tetsuya's five senses.

"Two feet, have you seen Nanjo-nee?"

"Nanjo left a while ago, saying she went to Hokkaido for a work report? Speaking of which, what does 'work report' mean, Lord Che?"

Uesugi Tetsu hummed in agreement, gazing at the gleaming gold panel amidst the two synchronized, silent pulses.

He gazed at his first [Legendary] item.

【All-in-One Furnace Core】

[Quality: Legend]

Effect 1: Imprint Rotation. The Myriad Spirits Furnace Core can automatically operate all the Yin-Yang techniques placed within it, gradually perfecting them.

The deeper your understanding of the Yin-Yang arts imprinted in the core of the Myriad Spirits Furnace, the faster the core of the Myriad Spirits Furnace will operate.

Current engraving slot: 1/2 (Zhou Tianyan Armor - Beginner)

[Effect Two: Fusion. Input spiritual energy, output physical power.]

[Effect Three: Ascension. Through repeated forging, the quality of the All-Powerful Furnace Core can be further improved.]

[—Walk, and the Demon King will be with you.]

Uesugi Tetsu listened silently to the deep, earth-shaking throbbing sound, and thought to himself...

"It seems it's time to bring back those talking creatures that roam freely throughout Edo Castle..."

"My soul has turned to ashes."

Chapter 317 Three Uesugi Tetsuyas Training Together: The Celestial Phenomenon is in the Palm of His Hand, the White Bone Wax Figure, Long Time No See

The power of the Wanling furnace core is exceptionally strong.

It's not just a second heart... it's practically equivalent to twenty hearts combined.

This is a result that Uesugi Tetsuya can experience and perceive without even having to experiment.