At this moment, it was early January, the coldest time of the year, but the morning chill couldn't dampen the Ninja's training enthusiasm.
The disciples' eyes followed Mutsuki's swinging arm, watching Mutsuki's fist with bated breath, afraid to make any noise that might disturb Mutsuki's performance.
Mutsuki didn't use any other abilities; he simply converted a large amount of Chakra into Armament Haki, hardening his fist and wrapping Haki around it.
He aimed at the riverbank not far away, and with the Armament Haki-covered fist, he swung forward like an iron fist.
Whoosh!!
Just as Mutsuki swung his fist, a strong wind rose suddenly. Kakashi could feel the gusts whistling in his ears, and the sound of leaves rustling as they were battered by the wind, heralding the imminent arrival of a sudden downpour.
Rumble!!
In the next instant, a huge rumble sounded as if the air had been blasted apart.
The shockwave caused by the swinging fist instantly shattered the trees in front of Mutsuki, and even Shisui and others behind him were affected by the powerful shockwave, struggling to maintain their balance and needing to use Chakra to adhere to the ground.
"Such exaggerated fist strength!"
Kakashi used his hand to block the various wood chips and leaves blown by the strong wind, squinting as he watched the shockwave destroy everything along its path, his face showing uncontrollable shock.
Kakashi had seen more than Obito and others, but he had never seen such a scene before.
Guy looked at Mutsuki, whose single punch had such terrifying destructive power, and felt even more excited.
Knowing that Mutsuki hadn't used the Eight Inner Gates or the Breathing Technique, if he used them together, wouldn't a single punch be enough to punch through the entire southern forest?
"Both attack and defense are equally excellent. If one can master it, it's much more important than learning a few more Fire Release Ninjutsu," Shisui judged inwardly.
Undoubtedly, the importance of Armament Haki can be compared to the Breathing Technique.
"Oh Sage Mutsuki, bless me. Let me learn Armament Haki as smoothly as Flame Breathing." Obito prayed inwardly, hoping to learn Armament Haki successfully.
After almost destroying all the trees along the way, the powerful shockwave plunged into the river with a loud bang. The river water continuously splashed, and a large amount of river water and various river creatures were sent flying.
Even Rin, who was practicing, temporarily stopped and curiously glanced in Mutsuki's direction.
Mutsuki was satisfied with his level of control. Such an attack would attract attention outside, but in the southern forest, which occupied a full thirty percent of Konoha's territory, it was just a small disturbance.
"Besides enhancing your own body, you can also use Color of Arms to harden your weapons."
Mutsuki cancelled the Color of Arms on his fist, took out a Kunai, attached Armament Haki's Hardening to the blade of the Kunai, and wrapped the power of Armament Haki around it.
Mutsuki casually picked up a nearby rock and flung the Kunai at it.
With a swish, the Kunai swiftly stabbed toward the rock, exploding it upon contact.
"What a versatile Secret Jutsu!" Kakashi couldn't help but exclaim. He had thought that strong offense and defense were impressive enough, but he hadn't expected it could also be applied to weapons.
Kakashi felt that this Secret Jutsu was perfect for his swift, precise, and ruthless swordsmanship. With the already sharp White Fang short blade further enhanced by Armament Haki, its intensity made Kakashi feel like not cutting through something hard would be a waste.
Guy didn't feel much about it; he wasn't skilled with Shuriken and rarely used Kunai, relying mostly on his fists and kicks in combat.
Shisui's eyes lit up; he felt that the short blade Mutsuki had given him would come in handy.
"As long as you train your Secret Jutsu proficiency, there are many things you can strengthen, even Ninjutsu,"
Speaking, Mutsuki extended his hand, concentrating a large amount of Chakra to perform Lightning Release Chakra Nature Transformation, and then a dazzling purple lightning appeared in Mutsuki's hand.
Mutsuki instructed Kakashi to summon an Earth-Style Wall, which Mutsuki shattered with the Purple Electricity.
After destroying the Earth-Style Wall, Mutsuki instructed Kakashi to summon another Earth Release to create a new wall.
This time, Mutsuki didn't use ordinary Purple Electricity; instead, he used Armament Haki-enhanced Lightning Release Purple Electricity.
Boom!
Under the terrifying destructive power of the black and purple lightning, the large and sturdy earth wall was instantly disintegrated, leaving only blackened rubble.
Although both uses of Purple Electricity displayed impressive power, the four disciples could clearly feel that the Armament Haki-enhanced Purple Electricity was even more powerful.
"This Secret Jutsu is too strong, it can even enhance Ninjutsu. Learning it would mean a direct qualitative change in overall strength, wouldn't it?" Obito felt that Mutsuki's new Haki Secret Jutsu was excessively powerful.
Although the Breathing Technique is powerful, Flame Breathing can only enhance Fire Release, and Stone Breathing mainly excels in enhancing physical abilities.
But Armament Haki is different. It can resist Ninjutsu with its defense, deliver attacks comparable to Ninjutsu with a single punch, and can also strengthen weapons and Ninjutsu.
"Learning it does indeed enhance a lot of strength, but it's not as exaggerated as you think," Mutsuki shook his head and said.
"First of all, Color of Arms cannot enhance all Ninjutsu. For example, it's difficult to enhance Fire Release techniques like Great Fireball. Also, using Color of Arms to strengthen Ninjutsu consumes a considerable amount of Chakra. Frequent use of Color of Arms to enhance Ninjutsu in battle will deplete a large amount of Chakra."
Obito's perspective was too simplistic. Although Color of Arms is strong, it burns through Chakra. Without a large Chakra reserve, it's not sustainable.
Especially for someone like Mutsuki, who has a plethora of high proficiency level skills, he feels that even with his Chakra reaching two hundred thousand, it might not be enough to sustain it.
High Proficiency level Nature Transformation can convert a large amount of Chakra in one go, and each Breathing Technique's mark is also a major Chakra consumer. Now, with the addition of Perfect-level Armament Haki, it's like having another bottomless pit.
"Ah, Fire Release won't work?" Obito scratched his head, suddenly feeling overwhelmed by the requirements of Armament Haki.
"It's not that Fire Release won't work, but rather that most Fire Release won't work," Mutsuki corrected.
"Next, except for Shisui, the three of you will learn Yin Release Nature Transformation," Mutsuki began arranging the next training session.
Most ninjas are born with a Chakra attribute, but that doesn't mean they can't master Chakra Nature Transformations beyond their innate attribute. It's just that learning the Nature Transformation of their innate attribute will be faster and have a higher potential ceiling.
Of course, there are exceptions. Some individuals may have more than one attribute or none at all. For example, Lee doesn't have any Chakra attribute, and when Mutsuki tested Guy's Chakra attribute, he found that Guy has two innate attributes: one is Lightning and the other is Fire.
Although Guy has two innate attributes, it's almost the same as having none, just like Lee. Learning Ninjutsu is too difficult for him, so it's better to spend more time training the body.
Yin and Yang attributes cannot be tested using Chakra paper. Mutsuki started teaching directly. However, to reward today's apprenticeship and training, Mutsuki chose to teach Shisui Armament Haki first, and his clones would teach Kakashi and the others Yin Release Chakra Nature Transformation.
"The essence of Yin Release is to create something from nothing by relying on spiritual power. It can be said that the core of using Yin Release is spiritual power," Mutsuki explained.
If you see particularly mysterious and hard-to-understand Ninjutsu in the Naruto world, it might be related to Yin Release, because Yin Release specializes in creating something from nothing.
As Mutsuki continued to explain, Guy began to get confused. He recognized every word Mutsuki said, but when they were put together, he didn't understand the meaning.
"Ah, this is so difficult!" Obito scratched his head, feeling that Yin Release Chakra Nature Transformation was much more elusive compared to Fire Release Chakra Nature Transformation.
"I see, it's quite unique compared to the five basic natures," Kakashi exclaimed, showing a sudden realization. He began to gradually understand Yin Release.
At this point, the gap in the three individuals' Ninjutsu talents became apparent. Although they all had S-rank potential, Obito and Guy's learning abilities in Ninjutsu were far lower than Kakashi's.
Although it was a Shadow Clone of Mutsuki, the proficiency level and teaching ability in Yin Release were genuine, just without the skill enhancement.
On the other side, Mutsuki's main body began the formal instruction of Color of Arms.
"Armament Haki is a Yin Release Ninjutsu. Yin Release Ninjutsu is about transforming nothingness into something through Chakra and imagination. When practicing Armament Haki, you can imagine an invisible armor on your body, and then manifest it using Chakra," Mutsuki explained to Shisui.
"Invisible armor..." Shisui fell into thought.
Armament Haki was a bit more challenging than he had imagined. He initially thought that having experience with Genjutsu, which also falls under Yin Release, would make it easier. However, after starting to learn, he realized that the differences between the two were significant.
"Don't try to apply your experience with learning Genjutsu to Armament Haki. Every Yin Release Secret Jutsu has significant differences," Mutsuki saw through Shisui's thoughts and reminded him.
Yin and Yang being classified as two special Nature Transformations is not without reason. The difference between Great Fireball and Great Fire Annihilation is merely that Great Fire Annihilation produces more flames. Everyone can easily recognize this as Fire Release.
However, if you were to perform Shadow Imitation Jutsu and Mind Body Switch Jutsu for someone who doesn't know about Chakra Nature Transformation, no matter how hard they try, they wouldn't imagine controlling shadows or invading minds. Yet, these two Ninjutsu actually belong to the same Nature Transformation.
The effects of different Yin Release Secret Jutsu and Yang Release Secret Jutsu are truly worlds apart.
[You have taught your disciple Armament Haki. Due to the disciple's deep gratitude, you receive a major critical hit reward, obtaining Ninjutsu Earth Release: Added-Weight Rock Jutsu (Proficient level).]
Although it was a Ninjutsu unrelated to Shisui, Mutsuki was accustomed to it. The apprenticeship reward wasn't always directly related to the disciple; it just had a higher probability. He once obtained Water Nature Transformation from Guy.
And it's also a nice little surprise. Added-Weight Rock is considered a top-tier Earth Release Ninjutsu; it can petrify enemies, increase their weight to slow them down, and enhance one's own weight to boost attacks.
As for Ultra-Added-Weight Rock Jutsu, it's essentially giving your all in using Added-Weight Rock Jutsu. It's not exactly two separate Ninjutsu; it's almost like the difference between Shinra Tensei and normal Rinnegan repulsive and attractive forces manipulation.
If Mutsuki were willing to gather all his Chakra into Color of Arms and unleash a punch, it could also be named Super Armament Fist.
Another similar case is Shadow Clone Jutsu and Multiple Shadow Clone Jutsu. Although Multiple Shadow Clone Jutsu is a forbidden technique, once someone becomes proficient with Shadow Clone Jutsu, they automatically master Multiple Shadow Clone Jutsu. However, most people wouldn't use so much Chakra on Shadow Clones.
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