The Shadow Clone Jutsu, a B-rank Ninjutsu developed by the Second Hokage Tobirama Senju, is widely spread throughout the Ninja World.
As long as he masters this technique and combines it with the Nine-Tails' Chakra within him, Naruto can create hundreds, even thousands, of Shadow Clones at will for training.
However, this technique has one drawback that cannot be ignored: the memories of the clones return to the original body.
This means that if Naruto summons several clones for training, after the training concludes, the pain of exceeding his limits or the feeling of being killed in battle will instantly feed back into Naruto's mind.
For an average shinobi, this could very likely lead to a mental breakdown.
Therefore, the practical application of this Ninjutsu in combat is not very high.
If a clone is destroyed, the instantaneous pain feedback to the original body could cause the user to become sluggish for a moment. Combat is a matter of split-second decisions, and a moment's hesitation can lead to death.
Thus, to use Shadow Clones in combat, one must at least train to the point where they can ignore the pain of a clone's destruction.
This was all information Naruto learned from Sasuke.
Although the information was comprehensive, the specific situation still depended on his own practical experience.
"Brat, your mother—" The Nine-Tails stopped halfway, realizing he'd misspoke. He quickly changed his phrasing with internet slang he'd learned from games: "Your chicken's difficulty and danger regarding this Shadow Clone technique."
"The previous Nine-Tails Jinchuriki spent a great deal of effort to successfully cultivate this technique."
"You must remember to start gradually. Don't create too many clones at once, or you'll die from the pain." The Nine-Tails smiled slightly, as if recalling something.
He remembered how Kushina, in her youthful ignorance, had done something foolish like that. The pain from hundreds of Shadow Clones exploding had reduced her to tears.
Sigh, even though Kushina was annoying, she was still a decent Jinchuriki.
Things change, and it's unexpected that Kushina's son is now his Jinchuriki.
If Kushina knew how Naruto was treated in Konoha, knowing her personality, she would definitely punch the Third Hokage hard.
Putting away his memories, the Nine-Tails smacked his lips and dismissively waved his hand. "With my Chakra, let alone a hundred, even a few thousand clones are easy. You should cherish this."
"I'll teach you after I finish this game."
"Okay." Naruto sat down on the spot, no longer bothering the Nine-Tails.
Not long after, in the training grounds.
Naruto began forming hand seals.
"Multiple Shadow Clone Technique."
"Bang, bang, bang." A series of sounds like firecrackers erupted, and then hundreds of Narutos in white robes, looking refined, appeared throughout the training ground.
As the Nine-Tails Jinchuriki, Naruto's Chakra was bottomless. Coupled with his terrifying recovery ability, the Multiple Shadow Clone Technique was practically tailor-made for him.
"Hello, everyone," Naruto greeted his Shadow Clones.
"Hello." Hundreds of Shadow Clones replied in unison, their voices deafening and their presence imposing.
"Very good, what do you all want to do now?" Naruto decided to test whether the Shadow Clones had independent thought.
"Train."
"I feel like sleeping."
"Chat with Third Grandpa."
"Help the villagers."
The 'Naruto's' answers varied.
Naruto nodded in satisfaction and looked at one of the Shadow Clones with an apologetic expression. "Sorry, I have to blow you up to experience the pain."
"Naruto, I think you can choose someone else. I'm different." That Shadow Clone said with a smile.
"I'm different too."
"You'll never see my true potential because we exist on different dimensions."
"Naruto, you won't do it. In my heart, you are gentle and refined. Tell me you won't blow me up."
"Naruto, I understand you want to become stronger. In my heart, you have extremely high talent. Before you blow me up, please give me the last five seconds to see this world."
The 'Narutos' began to act cool and sneer on their own, or transform into gentle men.
Naruto's expression turned dark as he blew up one Shadow Clone.
The pain instantly transmitted to his own body.
He only felt a slight sting in his chest, almost negligible, but it was there.
This level of pain was completely acceptable; even receiving such pain during a battle wouldn't affect his body.
However, one had to consider that if hundreds of Shadow Clones died simultaneously, the accumulated pain would be unbearable.
To be safe, Naruto dispelled most of the Shadow Clones, leaving only ten.
Standing in the open space, he cleared his throat, his eyes becoming resolute.
"Everyone, I think we all know our goal!"
"That is to become stronger. Without effort, talent will be wasted. To become Hokage, we need to possess power that surpasses everything, so..."
His words were interrupted by a Shadow Clone before he could finish.
"This kind of pep talk doesn't work on me. My eyes have seen through the void and grasped the essence."
One of the Shadow Clones smiled gently. "Naruto, you speak well. I feel the same as you. Let's work together towards a bright future."
The 'Narutos' with independent thought, just like Naruto himself, would maintain their personas while harboring inner pride.
This fact gave Naruto a real headache. He could only wave his hand to dismiss the Shadow Clones. "Arrange your own training, and don't slack off."
As soon as he finished speaking, the Shadow Clones scattered and disappeared one by one, leaving only Naruto behind after a short while.
So, my true personality is quite troublesome, Naruto thought, maintaining a perfect smile.
He stretched his limbs and picked up Kyōka Suigetsu to begin his Zanjutsu training for the day.
He knew that given his outwardly gentle yet inwardly proud personality, those Shadow Clones would definitely not be slacking off.
He, the original body, had to work hard too, lest he be surpassed.
"Naruto actually learned the Multiple Shadow Clone Technique?" The Third Hokage, in the midst of his usual "material gathering," took his gaze off the crystal ball, a thoughtful expression on his face.
The Multiple Shadow Clone Technique wasn't some high-end Ninjutsu, but from what channel had Naruto learned it?
Could it be the Uchiha?
The Third narrowed his eyes, a fierce glint appearing before he concealed it.
"Impossible. I've been observing him these past few days. Although Sasuke mentioned this Ninjutsu, he didn't teach Naruto the hand seals."
"Besides, the Uchiha aren't foolish enough to interfere with Naruto's training."
"Then it must be the Nine-Tails," the Third's eyes flashed with surprise.
"That vicious Nine-Tails is actually willing to teach Naruto Ninjutsu? I never expected this, but it won't affect my plans."
"A Nine-Tails Jinchuriki is perfectly suited for the Multiple Shadow Clone Technique. Naruto's growth speed will increase even faster."
"However, he still needs more bonds. Let him go to Iruka's class."
"Although Iruka hates the Nine-Tails, he is still gentle and kind at heart. Perhaps he will become another light for Naruto."
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