"Hoo—! Hoo…" Each time Allen breathed, two streams of white mist would spray from his mouth, which was a similar principle to the white mist that appeared on his body when he activated his Demon Back.
He could feel his blood flow accelerating, his heart rate exceeding two hundred, and his body temperature maintaining around 39 degrees Celsius. This state was effortless for him.
The wavy patterns on Allen's body surface became more numerous, gradually transforming from ripples into towering tsunamis, while simultaneously emitting an astonishing aura.
The temperature around Allen's body became even hotter due to the white mist.
"This full-body amplification is quite interesting." He could feel that all the cells within his body had been awakened by the activation of the Mark, and this level of amplification was quite considerable.
Allen continued to intensify his breathing. At this moment, he was like a mechanical vacuum pump, completely drawing away the surrounding air, creating a vacuum environment. If he were to push it to the point of frantically burning his life, he estimated it could rival or even surpass Asura Mode.
However, the side effects of activating Asura Mode were far less severe than this thing called the Mark. The stronger the effect of the Mark, the greater the damage and burden it placed on the body.
This could be said to be a way of exchanging life for power, as Demon Slayer Corps swordsmen who activated the Mark generally did not live past twenty-five.
Sakonji's eyes, hidden beneath his mask, widened. What kind of monster was this young man? He could use a Breathing Technique to draw the surrounding air into a near-vacuum environment.
He had never seen anyone with such terrifying talent and physical prowess, and in just a few days, the other party had already mastered the method of activating the Mark. Moreover, the intensity of his Mark was probably far stronger than previous Mark activators.
With Allen's Breathing Technique, any other member of the Demon Slayer Corps might have already exploded into a mist of blood. Sakonji's voice trembled slightly: "The Mark! This is a characteristic only found in the legendary Mark Swordsmen!"
Tanjiro also stopped swinging his nichirin blade and looked at Mr. Allen in surprise: "Mr. Allen, those patterns on your body are…"
"This is just a manifestation of a Breathing Technique," Allen replied calmly, looking down at the Mark on his own body.
Sakonji took a deep breath, trying to calm the shock in his heart: "Mark Swordsmen are extremely rare in history, and each possesses power beyond ordinary people. However, activating the Mark greatly shortens one's lifespan and causes extremely terrifying damage to the body."
"You are still young. There's no need to choose to burn your life for such extremely short-lived power." He thoughtfully reminded Allen that with his talent and power, he completely didn't need the Mark.
"This is not a problem for me at all," Allen interrupted him, raising his arm, the Mark glowing slightly with the contraction of his muscles.
"My physique is special after all; I can completely bear this level of burden."
"For ordinary people, this might be a deadly poison, but for me, even if I keep it activated, it won't cause any impact on my body. I can even turn this into an instinct."
Allen's expression was relaxed and he showed no abnormalities, but if someone were standing beside him at this moment, they would realize that the current Allen was like an oven, constantly emitting heat. The white mist he exhaled could even scorch a person.
Allen reduced the efficiency of the Mark. Although this intensity had no effect on him, it would affect Tanjiro and Sakonji beside him, so there was no need to constantly activate the vacuum domain.
Sakonji silently watched the Mark on Allen's body, his expression under the mask complex and unreadable. He slowly spoke: "Since that's the case, I will teach you all forms of Water Breathing."
"You just focus on teaching Tanjiro. Once the plan to hunt Muzan officially begins, I will leave here." Allen shook his head, believing that the various sword techniques of the Demon Slayer Corps completely restricted the Breathing Techniques. It was a great pity that such an interesting thing was limited by sword techniques.
How could a mere nichirin blade compare to Allen's tempered physique?
Sakonji was silent for a moment, then slowly nodded: "I understand, but Tanjiro still needs more basic training."
Allen looked at Tanjiro, who was sweating profusely: "His talent is good, he just lacks systematic training."
Over the next few days, Allen observed Tanjiro's training while continuing to research the mysteries of the Breathing Techniques.
"Mr. Allen, am I swinging the nichirin blade correctly like this?" Tanjiro held up his wooden sword, covered in sweat.
Allen walked over and gently adjusted his posture: "Relax your wrist a bit more, let the power flow naturally."
After adjusting according to the instructions, Tanjiro was surprised to find his movements much smoother: "It really is much easier!"
Sakonji stood by, his expression under the mask complex. Even in training disciples, could he not compare to him? Becoming this man's opponent must be a very unfortunate thing… On the morning of his fourth day at Mt. Sagiri, Allen stood on the cliff edge of Mt. Sagiri, feeling the fully restored power within him. Sunlight pierced through the clouds, casting a golden edge on him.
After these days of research, he had perfectly integrated the Breathing Techniques with his own abilities, creating a unique fighting style.
"Mr. Allen!" Tanjiro's voice came from behind him. The young man, grasping a katana, ran towards him, sweat still on his forehead from training.
"Mr. Sakonji said to come find you for sparring."
Allen turned to look at Tanjiro, noticing the new scars on his arm, and smiled slightly: "Come on, let me see the results of your training these past few days."
Tanjiro took a deep breath, assumed a fighting stance, his eyes becoming focused and his breathing gradually steady, adjusting his breath according to Sakonji's teachings.
He stomped his foot and charged forward. The wooden sword cut an arc. Allen stood still, merely shifting his body slightly to evade the strike.
"Your movements are too obvious, and your breathing isn't continuous enough," Allen commented.
Tanjiro nodded and adjusted his breathing again. This time, his movements were smoother, and the wooden sword sliced out continuously with a whooshing sound.
Allen still didn't move his feet, evading all attacks with only slight movements of his upper body.
"Very good, you're progressing quickly," Allen said approvingly.
"But your attention is too focused on attacking. You must always pay attention to defense."
Tanjiro showed a resolute look in his eyes: "Again!"
The two sparred on the cliff edge for an entire afternoon. The sun grew stronger, and Tanjiro's sweat soaked his clothes, but his eyes grew brighter and brighter.
As the sun set, Allen called a halt to the training: "That's enough for today."
"You've mastered the basics. What you need next is actual combat experience."
Tanjiro put away his wooden sword and bowed deeply: "Thank you for your guidance, Mr. Allen!"
Allen waved his hand: "Go rest. There's still training tomorrow."
Watching Tanjiro's departing back, the corners of his mouth curved slightly upward: "My transmigration value has increased a bit."
-------------------------------
I've already uploaded 70 chapters of this story on Patreon!
If you enjoy it, come check out the latest chapters in advance.
Here's the link:
[patreon.com/Greyhounds]
Thank you so much for your support!!
"And If you're enjoying it, drop a Power Stone for me!"