Training and Hollow Technique "Purple"

Following the Hashira Meeting, the Demon Slayer Corps headquarters sprang into action quickly and efficiently. Based on Moyu's suggestion and the Pillars' discussions, a targeted intensive training program was soon finalized.

Exceptionally talented and promising team members were quickly selected, with Tanjiro Kamado, Zenitsu Agatsuma, Inosuke Hashibira, and Kanao Tsuyuri being the core. These four would be sent in batches to the exclusive training grounds of different Pillars for one to two months of grueling training. Each member had to reach a specific standard under a Pillar and gain their approval before moving on to the next Pillar's training ground. This cycle was designed to fully exploit their potential and maximize their improvement in the shortest possible time.

Due to the unique nature of her Breathing Style, "Insect Breathing," Shinobu Kocho, the Insect Hashira, was not suitable for most Demon Slayer Corps members. Furthermore, she was responsible for overseeing the Butterfly Mansion's medical logistics and new drug development, and therefore did not directly participate in teaching and training.

The entire Demon Slayer Corps, like a giant furnace, began forging the sharpest blades to prepare for the impending storm.

Moyu, who proposed this plan, chose to stay in the Butterfly Mansion. His cultivation path is different from that of ordinary people, requiring more deep meditation, ultimate control and development of his own power, and the ability to deal with possible emergencies.

The following morning, Tanjiro, Zenitsu, Inosuke, and Kanao Tsuyuri, led by their respective Pillars, bid farewell to the Butterfly Mansion and headed to their respective training grounds. The once bustling Butterfly Mansion suddenly became much quieter.

Moyu stood under the veranda, looking at the empty courtyard. Aoi Kanzaki and the Beady-Eyed Trio were still busy taking care of the wounded and organizing medicines, but without Tanjiro, Zenitsu and Inosuke chatter, it felt a little lifeless.

"They've all left." Shinobu Kocho's gentle voice came from behind. She held a cup of freshly brewed herbal tea, her purple eyes sweeping across the courtyard with a hint of wistfulness. "It's so quiet all of a sudden, it's really a little strange."

"Hmm." Moyu took the teacup, the warmth emanating from the porcelain.

"What are your plans next, Moyu- jun? Will you stay at the Butterfly Mansion to cultivate?" Ren asked.

"Yes." Moyu nodded. "I need to take some time to settle down and try to master some new skills." He didn't elaborate, but Ren could sense the determination beneath his calm tone.

"Just let me know if you need any medicine or a training ground." Shinobu smiled slightly, not asking any further questions. She paused, looking at the familiar wooden box under the eaves. "By the way, please take good care of Nezuko. Tanjiro was very worried before he left, but it's really inconvenient to take her to the training ground, and besides, her situation is special; it's safer for her to stay at the Butterfly Mansion."

"I know." Moyu looked at the wooden box. When Tanjiro left, he asked him to take care of his sister, his eyes full of trust. Nezuko seemed to understand that her brother was going to be away for a while. Although she was a little uneasy, she obediently crawled back into the box.

After Ren left, Moyu returned to his room. He sat cross-legged and first summoned the system interface. The number [84900] on the Coins bar was flashing. He had mastered the basics of the Reversal Technique and could improve it further.

His gaze settled on one item on the exchange list:

[Reversal Technique (Advanced Application Analysis and Expansion)]: Contains deeper techniques for Positive Energy transformation. Advanced applications include: accelerating the healing of severe injuries, limited purification of abnormal states, restoring Mental Energy depletion, and preliminary external energy-guided healing of others. Exchange Price: 50,000 Coins.

Note: This is core advanced knowledge, extremely difficult to master, requiring prior knowledge of inversion techniques and exceptional talent in microscopic energy manipulation. Deeper mysteries must be explored independently.

"Exchange." Moyu didn't hesitate. With the decisive battle approaching, he had to improve his endurance and survivability as soon as possible.

[Exchange successful: Reversal Technique (Advanced Application Analysis and Expansion). Initiating knowledge transfer and deep consciousness imprinting... Consuming 50,000 Coins. Remaining Coins: 34,900.]

A stream of information, ten times more complex and a hundred times more sophisticated than that of a beginner's guide, flooded his mind! How to more efficiently reverse curse power through a "negative times negative equals positive" process, generating more active Positive Energy; how to guide this energy to accelerate the repair of severe injuries such as ruptured internal organs and shattered bones; how to use the properties of positive Positive Energy to dispel toxins, curses, and other abnormal states; even... how to release this energy with exquisite precision, guiding it into another person's body to aid in their healing! And the point that most captivated Moyu —the preliminary method for using the positive energy generated by the reversal technique to restore depleted Mental Energy!

Although the last point is of great significance! It means that his Mental Energy recovery speed will be improved during continuous combat! For someone who relies on the Six Eyes and high-precision spells, this is undoubtedly a godsend!

After digesting this knowledge, Moyu immediately began to try it out. He concentrated his mind and began to reverse the Breathing Style spell power in his body according to the new model.

The process was several times more difficult than when I first started! The energy flow path was much more complex, and the requirements for control precision reached an abnormal level!

Moyu opened all six of his eyes, observing every subtle change in energy, constantly adjusting and optimizing. His concentration reached its limit, and fine beads of sweat appeared on his forehead.

Buzz!

A gentle yet powerful, vibrant current of energy finally condensed successfully in the Dantian and flowed steadily along specific Meridians! This positive energy was several times stronger than the one generated when I first started practicing, both in quantity and quality! Wherever it passed, the slight fatigue accumulated from days of cultivation was quietly soothed! Even the slight weariness caused by intense concentration was greatly relieved!

"Success!" Moyu felt relieved. He continued to guide the energy, attempting to simulate "accelerating the healing of severe injuries." He pointed his fingers like a knife and made a deep, bone-revealing cut on his left arm.

Blood gushed from the wound. Moyu immediately channeled the Positive Energy he had gathered to the wound.

A miraculous thing happened! The muscle tissue at the wound site began to writhe, grow, and heal at a speed visible to the naked eye! The bleeding stopped rapidly, new granulation tissue began to grow, and the wound closed and scabbed over quickly! The whole process was more than ten times faster than natural healing! Although it consumed a lot of positive energy, the effect was remarkable!

"Very good!" Moyu said with satisfaction.

His mastery of advanced reversal techniques has given him a qualitative leap in survivability and endurance!

Over the next few days, Moyu Yu spent most of his days in deep meditation and practicing reversal techniques. At night, when Nezuko woke up from the wooden box, he would stop his cultivation and stay with her in the courtyard.

Nezuko seemed to know that her brother and Tanjiro had temporarily left. At first, she was a little listless, but with her little girl's nature, she was quickly attracted by the flowers, plants, and butterflies in the Butterfly Mansion's garden. She couldn't be exposed to sunlight, but under the moonlight and the glow of lanterns, she was still as lively as a little deer. Wearing a pink kimono, her small figure ran around the garden, chasing after fireflies, or curiously squatting on the ground watching ants move their nest, making cheerful "ooh ooh" sounds. Occasionally, she would run to the veranda where Moyu sat, tilt her little face up, look at him with her clear pink eyes, and then reach out her little hand to tug at his clothes, as if wanting him to play with her.

Moyu usually just watches her quietly, a hint of gentleness flashing in his Azure eyes. He would gently pat her head, and Nezuko would happily squint her eyes, sit obediently beside him, and swing her legs.

This tranquil companionship was a rare moment of relaxation for Moyu, who was constantly engaged in intense training and battles.

Three days later, Moyu felt that he had gained a deeper understanding of the application of advanced reversal techniques, and his mental and physical state had been adjusted to its peak. He decided to start trying that incomparably powerful Ultimate Move —the illusory "Zi" that fused the power of "Cang" and "He"!

As evening fell, the setting sun painted the sky a brilliant orange-red. Moyu arrived alone at a secluded Valley Butterfly Mansion, far from any human habitation. The terrain here was open and rocky, making it the ideal place to test his ultimate move.

He stood in the middle of the Valley, took a deep breath, his Azure eyes shimmering, and activated all six of his eyes to bring himself to his peak condition.

"First, there's the ultimate in the smooth flow of the technique—Azure."

He raised his right hand, palm up. With a thought, immense magical and Mental Energy surged forth! A fist-sized, deep black sphere, radiating terrifying gravity, instantly condensed! This "Azure" was more solid and stable than ever before, its gravitational singularity seemingly capable of devouring all light and matter! The surrounding space distorted violently, and the rubble on the ground was pulled up by an invisible force, swirling around the black sphere before being sucked in and swallowed!

Maintaining the steady output of "Azure", Moyu's eyes narrowed and he raised his left hand at the same time!

"Then comes the ultimate in technique reversal—Hercules."

In front of his left palm, space began to repel and expand! An energy sphere of the same size, but dark red in color and exuding an aura of extreme destruction and repulsion, rapidly took shape! This "He" had also reached the limit of what he could currently control, and the Annihilation power contained within it caused the surrounding air to crackle and pop!

With the destructive repulsion of "He" in his left hand and the devouring attraction of "Cang" in his right, two completely opposite and extreme forces converged on either side of Moyu's body. The resulting massive energy conflict caused the air around him to surge wildly, making his clothes flutter wildly! Even with his current physique and Mental Energy, he felt considerable pressure maintaining these two extreme forces at the same time!

The most crucial step has arrived—fusion!

Moyu's eyes were sharp as knives, elevating the perception and control of his Six Eyes to an unprecedented level! He carefully began to slowly gather the strength of his left and right hands!

The moment "Cang" and "He" made contact, there was no violent explosion as expected. Instead, a strange "stillness" occurred! The two forces seemed to be locked in a stalemate, one trying to devour the other, and the other trying to repel it! The contact surface burst forth with blinding white light and countless dark red arcs of electricity! The surrounding space was distorted to its limit, as if it would shatter at any moment!

Moyu's forehead veins bulged, and sweat poured down his face! The difficulty of the fusion far exceeded his imagination! It was not just a simple superposition of energy, but a forced fusion of two completely opposite laws! It required a powerful microscopic control over energy and a strong mental will!

The first attempt failed! At the very moment of fusion, the energy went out of control, and "Cang" and "He" Annihilation each other, producing a violent explosion! Boom! Moyu was thrown away by the shockwave and crashed heavily into the mountain wall. He felt a sweet taste in his throat and suffered a minor injury.

"Cough cough... It wasn't that simple after all." Moyu wiped the blood from the corner of his mouth, reversed the spell, and his injuries healed rapidly. He was not discouraged. His six eyes replayed every detail of his previous failure at high speed, analyzing the points of energy conflict and balance.

After a short rest, he regained his energy and began his second attempt.

Condensing the "Azure" and gathering the "Radiant," they carefully brought the two closer together... Six eyes were fixed on every slight change in the energy contact, their minds taut to the extreme!

Moyu formed a strange hand seal with his hands—his right thumb and middle finger interlocked, while the other three fingers were slightly bent, as if plucking a flower or flicking his fingers! It was the activation gesture of the virtual "Zi"!

The instant the handprint was formed, he felt that the extreme opposition between "Cang" and "He" seemed to have found a strange balance! Repulsion and attraction were no longer simple confrontations, but formed a dynamic and unstable unity! An extremely tiny singularity, yet radiating an indescribable terrifying fluctuation, was born between his hands!

Now!

Moyu's eyes flashed with a sharp light. With all his might, he launched the singularity containing the fusion of "Cang" and "He" towards a rocky hill tens of meters high in the distance!

"Virtual style--""!"

Call out--!

There was no deafening roar, only a sharp, teeth-grinding buzzing sound, as if space itself had been forcibly torn apart! A thin beam of energy, its edges twisted with a mixture of dark purple and black, pierced through hundreds of meters in an instant, as if traversing space itself, and struck the opposite hill!

The instant the energy beam struck the hill, there was no explosion, no fire. The part of the mountain that was hit vanished instantly, like butter pressed onto a red-hot iron, leaving a smooth, mirror-like circular notch over ten meters in diameter! The rocks and soil at the notch seemed to have never existed, completely erased from the world! Then, terrifying follow-up energy erupted, shattering and collapsing large sections of the mountain around the notch!

Rumble--!

The attack left long tracks on the trees and ground along its path, and the lower half of the massive hill was almost completely sheared off! Debris rained down, and dust filled the air!

Moyu was panting heavily, his face slightly pale. That attack had almost drained a third of his Mental Energy! The consumption was several times greater than that of casting "Cang" or "He" alone! But looking at the hill that had been wiped away in the distance, his Azure eyes were filled with shock and satisfaction.

"Success... virtual style ""!"

With that kind of power, Muzan would probably run away if he saw it.

"Moyu Yu!"

A purple figure swept in from the direction of the Butterfly Mansion at incredible speed; it was Shinobu Kocho. She was clearly startled by the terrifying commotion just now, her face showing rare anxiety and worry. When she saw Moyu panting in the center of the Valley, the attack marks hundreds of meters long, and the pierced mountain peak in the distance, her purple eyes were filled with disbelief and shock!

"That was... you did that?!" Shinobu's voice trembled slightly. The destructive power was completely beyond her imagination!

Moyu slowly stood up, calmed his breathing, and nodded. "Yes, testing a new move, it was a little too loud."

Ren walked to his side and carefully examined him. She breathed a sigh of relief when she found that he was just exhausted and had no obvious injuries, but the shock in her eyes had not faded. "A new move? This... this is simply... a cataclysmic power..." She couldn't find the right words to describe it.

"It consumes a lot of resources, so it can't be used lightly," Moyu said honestly.

Ren glanced at the devastation in the distance, then at Moyu, her purple eyes filled with a complex mix of emotions: shock, relief, and a hint of unspoken worry. Moyu's rate of improvement was terrifyingly fast.

"Go back, you need to rest," Ren said softly, her tone returning to its usual gentleness. "I'll brew you some herbal tea to help you recover."

"Thank you for your trouble." Moyu did not refuse.

When the two returned to the Butterfly Mansion, it was already late at night. Nezuko seemed to have been frightened by the commotion earlier and was pacing anxiously by the box. When she saw Moyu return, she ran over with a "woof woof" sound and hugged his leg, her little face full of worry.

Moyu bent down and gently patted her head. "It's alright."

Nezuko looked up at him, seemingly to make sure he was really alright, before letting go of his hand with relief. She then regained her liveliness and ran off to chase after a passing moth.

Under the moonlight, the Butterfly Mansion remained peaceful. (I'm planning to finish off Muzan as soon as possible Muzan escape. This is a bit of a bad story; I'm planning to run away.)