702: Mugen Train

Shadow Breathing required immense stamina, and weighted running was a very comprehensive training method. Coupled with utilizing the Shadow Breathing technique to expand his potential, it was quite helpful.

Within a year, Su Chen was confident that he could make the Wind Hashira the strongest among all the Hashira, aside from himself.

The Wind Hashira's speed was increasing; it did not slow down despite the increased distance. Instead, every day it was clear that the Wind Hashira was returning faster.

Even he himself noticed the changes in his body.

His speed and strength had both improved.

The Wind Hashira was incredibly excited. He knew this wasn't due to the running itself, but rather the credit of Shadow Breathing. The reason their Physical Body could become more formidable was entirely due to the breathing technique.

The running exercise was merely squeezing out his physical stamina to allow the breathing technique to achieve better Fusion with his body.

Furthermore, the strength of the Physical Body was also related to the breathing technique.

The core of Shadow Breathing lay in the word 'speed,' followed by strength. Therefore, every five days or so, Su Chen would increase the weight he was carrying by about thirty percent.

Two months passed quickly.

Su Chen had already researched Shadow Breathing up to the Tenth Form.

The Eighth Form was Demon Eye, which used the breathing technique to enhance one's eyesight and see the enemy's movements clearly. It was somewhat similar to the Transparent World, but not as powerful.

The Ninth Form, Single Blade Slash.

As the name implied, it was about unleashing the terrifying power of a single strike.

The Tenth Form, Death Bloom, was currently the most formidable killing Move in Shadow Breathing; even Su Chen could only execute it about ten times.

Because it required consuming much more stamina, if the Wind Hashira were to use Death Bloom with his current strength, he would likely exhaust his stamina completely; using it once would be his limit.

However, Su Chen did not stop; he was still constantly developing subsequent Moves.

The Tenth Form was not the end.

Over the course of two months, the Wind Hashira's strength had increased by nearly fifty percent compared to before. Considering he was already a Hashira, having reached the pinnacle of the Demon Slayer Corps, how could he not be excited to grow to such a level in just two months?

Originally, the Wind Hashira's strength was inferior to the Stone Hashira, but after this period of training, the Wind Hashira's strength had definitely surpassed the Stone Hashira, making him the strongest Hashira currently, excluding Su Chen.

The Wind Hashira continued his weighted running as usual, tireless.

When the sun went down, the Wind Hashira returned to where Su Chen was.

"Remember to come tomorrow."

Su Chen said this, then closed his eyes again.

The next day.

The Wind Hashira came again. Just as he was preparing to continue running, Su Chen spoke slowly: "No running today. Let's have some sparring."

Sparring!

The Wind Hashira's eyes were filled with excitement. He had grown so much over these days and was desperate to fight.

The two went to an open space. They did not use real blades, but used wood instead.

The Wind Hashira took a deep breath and looked at Su Chen with a solemn gaze.

He knew very clearly how powerful the person before him was. He still had a vivid memory of when Su Chen had used Shadow Assault on him previously.

The Wind Hashira chose to attack first, his speed suddenly increasing.

"So fast!"

The Wind Hashira's eyes were filled with astonishment; when had his speed improved so much?

In the blink of an eye, the Wind Hashira reached in front of Su Chen.

"Shadow Breathing, Fourth Form, Shadow Assault!"

As the Wind Hashira's voice rang out, his speed suddenly accelerated, appearing behind Su Chen in a way that was almost impossible to see with the naked eye.

A terrifying attack immediately struck toward Su Chen's neck.

Su Chen's speed was extremely fast; he raised his hand and blocked it.

"What!"

"Your speed and strength are passable, but your killing intent is still too weak—or rather, there is no killing intent at all. Your method of attacking is far too monotonous." Su Chen's calm voice rang out.

It wasn't just the Wind Hashira who had this problem; everyone in this world was the same. Their understanding of the Dao of martial arts was not strong. Their attacks were merely a combination of speed, strength, and technique, lacking anything else.

Such as... Aura!

Aura was not exclusive to a Cultivator; it was an extremely special psychological state. A person who possessed their own Aura would be significantly stronger than those who did not.

Su Chen backhanded a strike toward the Wind Hashira. The Wind Hashira hurriedly blocked it, but was still sent flying several meters away, his arm numbed by the impact.

The Wind Hashira's eyes were filled with shock.

What terrifying strength!

Just this simple strike could cause such power; if he used Shadow Breathing, how terrifying would that be?

During this time, while the Wind Hashira was growing, Su Chen was naturally growing as well.

Afterward, Su Chen deliberately held back while continuously fighting the Wind Hashira. The Wind Hashira was constantly suppressed. His talent to Cultivate was decent, and after some fighting, his strength noticeably improved, his strikes became more ruthless, and he became more proficient in using his own Moves.

Now, he had almost completely abandoned Wind Breathing.

"Still far from enough. The core of Shadow Breathing lies in killing intent. Your Moves have the form but lack the core; thus, their power is greatly diminished."

The Wind Hashira panted heavily. Upon hearing this, a look of confusion flashed in his eyes.

Killing intent?

He had been thinking about this question for days—what exactly was killing intent?—but he had never found a concrete answer.

Su Chen glanced at him, then spoke calmly: "Think about your hatred for demons. Killing intent is actually very simple; it is the determination to Move forward unflinchingly and kill the other party."

The Wind Hashira frowned deeply and looked toward Su Chen again.

In an instant.

A thick killing intent permeated outward, and his speed suddenly increased.

"Shadow Breathing... First Form, Instant Flash."

The Wind Hashira's figure suddenly appeared in front of Su Chen.

"Fourth Form... Shadow Assault!"

His figure vanished again. When he appeared, he was already behind Su Chen, his wooden sword striking fiercely toward Su Chen.

At this moment, the look in the Wind Hashira's eyes as he looked at Su Chen was not like he was looking at a person, but rather a demon. His eyes carried fierce killing intent.

"Bang!"

Su Chen still blocked him easily, as if he had seen through the Wind Hashira's attack method. He nodded: "Not bad. This is about the right feeling."

This strike was unexpected; if the top three Upper Moons encountered this Move, they might even have their heads cut off if they weren't careful.

"Alright, that's enough for today."

"Continue training as before until you can use Shadow Breathing completely freely."

Su Chen said in a calm voice, then turned and left.

The Wind Hashira nodded, and he also turned and left.

Su Chen, however, did not stay as he usually did. Yesterday, he had received news that many people had gone missing on the Infinite Train recently, and the Flame Hashira had already been sent there.

According to the original plot, the Flame Hashira would encounter Upper Moon Three there.

The Flame Hashira would also fall there.

Upper Moon Three, huh.

I also want to experience what kind of strength that is.

Su Chen stood up. His speed was extremely fast, and he vanished from the courtyard in the blink of an eye.

Night.

Su Chen's figure was like a phantom, flashing rapidly through the mountain forest; his figure was completely impossible to see with the naked eye.

Arriving at the location of the Infinite Train, Su Chen followed the train tracks and smelled the scent of a demon. He immediately judged that it was not far ahead, and his figure vanished once again.

His speed was incredibly fast.

"What a strong Aura. Hurry and say you will become a demon, and fight with me forever."

The voice of Upper Moon Three, Akaza, rang out. Not far from him was the red-haired Flame Hashira, his gaze firm, with a terrifying Aura condensing within his body.

The final battle between the two was about to begin.

"Seems like perfect timing."

Su Chen saw this scene. It was fortunate he had arrived quickly; the next strike would determine the Flame Hashira's death. If he had been any slower, the Flame Hashira might not have been saveable.

"Flame Breathing, Ninth Form..."

"Swish!"

Suddenly, footsteps sounded from the side. The Flame Hashira was slightly stunned, then subconsciously turned his head to look.

"You are..."

Su Chen wore a sword at his waist, his posture looking incredibly light. A smile was on his face: "Leave the rest to me."