Now that he had arrived at the Holy Land, Rei suddenly thought of something very important—Sage Jutsu.
"Kizaru, do you want to learn senjutsu?"
Katsuyu hesitated for a moment before explaining:
"Sage Jutsu is the power of absorbing natural energy from the world and combining it with your own physical and spiritual energy to maintain balance."
"This fusion of energies is known as Senjutsu Chakra."
"The techniques cast with Senjutsu Chakra are called Sage Arts, which can be dozens of times more powerful and effective than ordinary ninjutsu!"
Katsuyu didn't hide anything.
Or rather, it didn't feel the need to.
After all, throughout history, only Senju Hashirama had successfully mastered the Sage Jutsu of Shikkotsu Forest.
Even his granddaughter, Tsunade, had failed to enter Sage Mode.
"The key to mastering Sage Jutsu lies in capturing the natural energy present in the air and properly balancing it with the other two types of energy within the body."
"If you can do that, you will succeed."
Rei sat cross-legged on the ground, scratching his head.
"Sounds difficult..."
"Kizaru, you should at least try it first."
Katsuyu suggested.
After all, with its presence, even if Rei failed, nothing too serious would happen.
When training in senjutsu, the Toads of Mount Myōboku often used a special item called Toad Oil.
It helped practitioners sense and absorb the natural energy around them.
As one of the three great sacred places, Shikkotsu Forest naturally had something similar—Katsuyu's Slime.
Though it sounded a bit... weird.
However, in the face of one of the most advanced powers in the ninja world, Rei wasn't going to hesitate.
A moment later, he was already shirtless.
Despite being only thirteen years old, Rei's physique was already quite impressive.
In the ninja world, this age was practically considered adulthood.
Both physical and mental development here was far more advanced compared to his previous world.
As a result, children in this world matured much faster.
At this moment, Rei stood at 1.75 meters tall and was still growing.
Even people like Suzune, Kushina, and Minato were full of youthful vigor.
His well-defined muscles were exposed to the air.
A dozen Katsuyu clones quietly attached themselves to Rei's body.
These were all fragments of Katsuyu Sage itself.
They would assist him in absorbing the natural energy floating in the air by continuously secreting their special mucus.
Rei placed his hands on his abdomen in a meditative seal, closed his eyes, and began to focus.
As he meditated, his Observation Haki started to spread outward.
With the assistance of Katsuyu's slime, he carefully attempted to perceive the natural energy in the air.
Under normal circumstances, even with Observation Haki, Rei could only detect the presence of living beings.
Air itself was usually blank to his senses.
But now, thanks to Katsuyu's slime, he could "see" tiny traces of natural energy floating around him.
"Feel it. Attract it," Katsuyu instructed.
Rei concentrated, his spiritual power stretching out like invisible tendrils, pulling natural energy toward him.
At the same time, his physical and mental energies mixed rapidly within his body.
As the energies merged, they formed chakra, which was then infused with natural energy, transforming into Sage Chakra.
However, Katsuyu soon noticed that something was off.
"Wait... how is Mr. Kizaru absorbing natural energy so fast?!"
Rei's spiritual power was far beyond that of ordinary people.
Now, with the combined aid of Katsuyu's slime and Observation Haki, his ability to absorb natural energy was downright terrifying.
For most people, using senjutsu was like politely asking nature, "Hey, could you spare me a little natural energy?"
But Rei?
He was outright robbing it.
Like smashing open a treasure chest and looting everything inside without hesitation!
This level of absorption speed was a great advantage for those who had already mastered Sage Mode.
The more natural energy they absorbed, the more powerful their Sage Chakra became.
Take Hashirama, for example.
His natural energy absorption speed was equally monstrous.
Combined with his Sage Body, he possessed a ridiculous amount of chakra.
His True Several Thousand Hands could casually slap Nine Tails around like a toy.
Being called the "God of Shinobi" wasn't an exaggeration—it was simply a fact.
However...
There was a problem.
Rei did not have a Sage Body.
While he was wildly inhaling natural energy, his body couldn't produce enough chakra to balance it.
The result?
A severe overload of natural energy!
His body was starting to lose control.
"Stop, Kizaru!"
Katsuyu immediately warned him.
At the same time, the Katsuyu clones attached to Rei quickly detached.
However, the excess natural energy had already begun to affect him.
A thick mist of steam rose from his skin.
His entire body burned like a red-hot iron slab.
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