The Uchiha clan's dedicated training grounds covered a fairly large area and were divided into several zones based on different functions.
There were standard training areas for clan members to exercise their physical abilities and basic ninjutsu skills on a daily basis; there were also areas specifically used for sparring, allowing them to sharpen their combat abilities; and there were even highly confidential special training zones, usually accessible only to core members of the Uchiha clan or those tasked with important missions, where they could practice secret techniques or undergo classified training.
When Rengoku arrived, he was surprised to find Nagato and Yahiko there as well.
At that moment, Yahiko was practicing Water Release in front of a target.
He stood there completely focused, hands forming seals with practiced ease, and let out a low shout, "Water Release: Water Rain Arrows!"
In an instant, the surrounding air seemed to be drawn by some force, rapidly gathering large amounts of water.
In the blink of an eye, it condensed into countless extremely sharp water arrows, shooting toward the target like a storm.
Accompanied by a dense series of sharp whooshing sounds, the water arrows slammed into the target with astonishing speed and impact.
A string of dull explosive sounds rang out, and the originally sturdy target instantly shattered into fragments scattered across the ground.
Seeing several Rengokus arriving together, Yahiko froze for a moment, then waved his arm.
He greeted Rengoku with a bright, cheerful smile, "Rengoku, long time no see."
"Heh!"
Seeing Yahiko smiling so openly, Rengoku found it hard to connect him with the "god" he used to be.
At this time, Nagato was sitting by the side of the training ground eating something.
He stood up as well and greeted him, "Rengoku."
There were five of Rengoku's clones here. One of them patted Nagato's shoulder, signaling him to sit.
The others walked off to a corner and began practicing ninjutsu.
"When did you get back?"
Nagato and Yahiko had been in the Land of Rain for quite some time.
When Pain was around, the Hidden Rain Village had always been led by him.
After Pain disappeared, the village didn't change much, because Konan was still there, and the Akatsuki still existed.
In the last ninja war, Akatsuki had openly leaned toward Konoha.
The people of the Land of Rain were completely in favor of this.
After all, when they didn't rely on any country before, the Land of Rain, as a buffer state between major nations, was constantly plagued by war and heavy casualties.
Under such circumstances, it was better to attach themselves to a major ninja village.
In the following years, Konoha's development speed far exceeded everyone's expectations.
After Konoha took a piece of land from the Land of Wind and allowed the Hidden Stone to open a path through the mountains along the Land of Rain's border, the establishment of Sandthorn(Shaji) City brought many development opportunities to the Land of Rain.
With deliberate intervention, the environment there also improved greatly.
There was even a national highway from the Land of Fire that directly passed through the Land of Rain to Sandthorn City.
This allowed the Hidden Rain Village's specialty medicinal fungi products to be sold externally.
Now, the people of the Land of Rain were just waiting for the day Konoha officially announced its occupation, so they could fully join it.
Hearing Rengoku's question, Nagato showed a faint smile, "I just got back two days ago. I came back to cooperate with Orochimaru on some experiments."
"I knew you were busy, so I didn't go looking for you."
"Here, try this," As he spoke, Nagato handed over what he had been eating.
Rengoku took it and found it was a piece of crystal-clear jelly cake.
He looked slightly surprised. In his impression, Nagato didn't seem like someone who bought snacks.
Looking more closely, it didn't seem like something sold outside.
Rengoku put it in his mouth. It was soft and chewy, cool and refreshing.
"Mm, it's really good. Where did you get it?", Rengoku asked deliberately.
Nagato smiled gently, "Kasui made it."
Rengoku's expression shifted slightly, but he didn't ask further. Instead, he changed the topic to Nagato's eyes.
"How are your eyes?"
After seeing Rengoku only take a small bite, Nagato closed the box again. Making this took time and effort, so he planned to eat it later.
"The experiment I came back for this time is related to my eyes."
"Orochimaru examined them. The activity level of my eyes is very high, but the amount of ocular power I can provide is very low. It needs additional stimulation for the eyes to evolve."
"This time, I'm preparing to inject the 'Hashirama No.1' serum."
Rengoku nodded. It seemed Orochimaru was steadily advancing his experiments.
"I remember you're proficient in six types of chakra nature transformations, right?"
Nagato gave a short acknowledgment.
At the age of ten, under Jiraiya's guidance, he had already mastered water, fire, earth, wind, lightning, and yang chakra nature transformations.
A true genius.
But that was exactly the problem.
Despite Nagato's talent and even possessing the Rinnegan, Jiraiya never properly nurtured him.
Instead, he insisted on searching for the Child of Prophecy.
If Jiraiya had stayed by Nagato's side all along, many things in the ninja world might have turned out differently.
"Rengoku?"
Rengoku had been lost in thought for a bit too long, and Nagato called out to bring him back.
Nagato pointed at Rengoku's four clones. "What are you doing?"
Each of the four clones was forming seals for Earth, Lightning, Wind, and Water Release respectively.
But the earth wall they summoned was only half a person tall, not enough to block attacks, barely even enough to block wind.
The lightning release was almost comical. A few sparks flickered in the hand before disappearing.
The wind release only produced a slightly stronger gust.
As for the water release mist technique, it only produced a small puff of white mist near the mouth.
Rengoku laughed, "I'm developing the other four chakra nature transformations."
Nagato was momentarily stunned, "You're developing four at the same time?"
Rengoku confirmed, "That's right. My strength has already hit a bottleneck. Next, I need to properly develop the other four chakra nature transformations."
Nagato looked at the training progress of Rengoku's clones. It was clear Rengoku was almost completely unfamiliar with those other nature transformations.
"This will consume a lot of time and energy."
Normally, a ninja would only have one main and one secondary nature transformation.
Because a person's chakra is limited, and which nature they're suited for is something innate.
Most people don't have enough chakra to use many ninjutsu every day.
Even the Uchiha clan, with their large chakra reserves, usually only choose techniques that suit them.
They generally don't spend much time developing unfamiliar chakra nature transformations.
With that time and energy, they would gain more by developing their Sharingan or training taijutsu.
But Rengoku clearly didn't fall into that category. His chakra reserves were enormous, "That's not a problem. I've got plenty of time and energy."
Seeing that Rengoku had already made up his mind, Nagato didn't try to persuade him further, "In that case, I'll explain some of the techniques to you."
Rengoku had been thinking about finding someone to learn from, so Nagato offering to teach him was perfect.
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