As for the newly developed version of the Basic Internal Energy Technique, it no longer deserved the "basic" label.
"This is a chakra Internal Energy Technique developed specifically for myself."
"Its future development will be multi-faceted."
Jin pondered for a moment.
"Let's call it the 'Heavenly Demon Art'."
After all, it sounded quite impressive.
Jin extended his hand, condensing chakra within it. The originally blue chakra had transformed into an inky black.
"Shadow Clone and other Three Body Techniques aren't significantly affected."
"But the Breathing Technique and Fire Release jutsu can be completely tossed into the trash."
"I need a new Breathing Technique to complement my swordsmanship. Additionally, my chakra now amplifies Yin Release jutsu."
Although most Yin Release jutsu were clan secrets, for Jin, whose chakra nature was now fixed, he could use any that weren't Kekkei Genkai. He even had an advantage in learning them.
He wondered if people would suspect infidelity within the Uchiha or Nara clans.
It was a matter worthy of contemplation.
However, it wouldn't be wise for an Uchiha to openly use the Nara Clan's Shadow Imitation Technique in Konoha.
Although he didn't get along well with Nara Shikaku, it was simply a rivalry between men due to their similar... preferences.
Their shared appreciation for mature women had nothing to do with animosity. He had no conflict with the Nara Clan itself.
His gaze shifted back to the copy of the Scroll of Seals, landing on a technique with a rather interesting origin.
"Bringer of Darkness Technique."
Jin stroked his chin. If he remembered correctly, the official Naruto sources from his previous life mentioned that Tobirama Senju developed this technique specifically to counter the Uchiha's Sharingan.
While it was labeled as a genjutsu, it functioned more like a ninjutsu. Genjutsu involved invading the target's mind, whereas the Bringer of Darkness Technique directly created a space of darkness.
Trying to dispel it as a genjutsu wouldn't work. Without the caster's permission, everyone would only see complete darkness.
It was a ninjutsu that sealed off vision.
In reality, its effectiveness was limited when not used against the Uchiha. After all, a single large-scale jutsu would easily break it.
As for the Uchiha Clan, with the exception of Uchiha Jin, they all had an inexplicable confidence in their Sharingan.
It wasn't even the Mangekyou Sharingan. Jin couldn't understand what they were so confident about.
"What if I combine it with the Shadow Imitation Technique and the Sharingan's enhancement?"
Then, the darkness he created would become his domain.
And if he added the Flying Thunder God Technique...
He glanced at the Flying Thunder God in the Sealing Scroll. This technique required a certain level of spatial aptitude and understanding of sealing jutsu.
Jin met these criteria.
"I'll take it slow."
Jin sighed.
He hadn't even begun cultivating the Heavenly Demon Art yet.
The development direction of this Chakra Internal Energy Technique would undoubtedly be similar to the Heavenly Demon Art he knew from his past life.
Absorbing chakra, absorbing lifeforce, absorbing essence, absorbing blood energy...
"These all need to be achieved step by step."
Jin had many ideas, but they were just that – ideas.
He needed to master the basics of the Heavenly Demon Art first.
"Knock, knock. Knock, knock."
A knock came at the door. Jin, sporting dark circles under his eyes from the sleepless nights spent trying to grasp the basics of the technique, walked to the door.
"Who is it?"
Jin yawned as he opened the door. He saw Yashiro standing there.
"Yashiro-san, what brings you here today?"
Jin invited Uchiha Yashiro into the room.
This reception was a stark contrast to a certain Uchiha who always barged in uninvited.
After Jin brought out some fruit, Yashiro chuckled and explained his visit. "I came to say goodbye. I'm heading to the Land of Hot Water tomorrow."
The Land of Hot Water bordered the Land of Fire and the Land of Water.
"You mentioned it last time, I remember."
Jin recalled their previous encounter, where Yashiro said he would be going to the battlefield with Fugaku.
He didn't expect Yashiro to come specifically to say goodbye.
Yashiro noticed Jin's heavy dark circles and began to ramble like an old man.
"You need to rest... You're still young..."
Jin was almost falling asleep listening to him. Although Yashiro was a kind person, he didn't know where he picked up the habit of nagging the younger generation.
Seeing that Yashiro showed no signs of stopping his endless chatter, Jin quickly interrupted. "Yashiro-san, what's the current situation with Kirigakure?"
If any of the Five Great Ninja Villages truly embodied the essence of a ninja, it was Kirigakure.
They practiced stealth and assassination. Kirigakure didn't have many large-scale jutsu, but they had a significant number of experts in assassination.
"Kirigakure, huh." Yashiro frowned when the topic came up. "I don't quite understand them either. From what we've seen in the Land of Hot Water, they mostly fight against those cult ninjas."
"The ninjas from Kirigakure are always secretive. They disappear without a trace."
"At least Konoha's outposts haven't been transformed into trench camps yet. That's good news."
Information on Kirigakure was essential for every Uchiha to grasp. After all, Konoha frequently dispatched Uchiha to deal with Kirigakure.
In reality, Kirigakure's abilities were quite unfavorable for the Uchiha.
Not only did their proficiency in Water Release counter the Uchiha's Fire Release, but their signature Hiding in Mist Technique completely countered the Sharingan.
The Sharingan didn't have the Byakugan's ability to see through obstacles.
In fact, the Hyuga Clan should be the most effective against Kirigakure.
However, Konoha's deployment of the Hyuga Clan involved spreading them thinly across all fronts, leaving the Uchiha to deal with Kirigakure on their own.
"Cults..." Jin thought of a certain immortal ninja from the future and became intrigued.
"Do they have any immortality jutsu?"
He was extremely curious about the jutsu that Hidan would use in the future.
Yashiro shook his head. "They don't have any immortality jutsu, but their techniques are very strange and difficult to defend against."
"Without prior intel, don't engage cult ninjas rashly. You'll suffer greatly."
Yashiro spoke from experience. Unlike typical ninjas who specialized in large-scale jutsu, or ninjutsu, taijutsu, or genjutsu, the cults in the Land of Hot Water were unpredictable. A mere genin could potentially kill a jonin.
A seemingly powerful jonin might not even be able to defeat an ordinary genin.
"Yashiro-san, have you heard of the Jashinists?"
"Jashinists?" Yashiro shook his head. "Never heard of them. Probably some small cult. Are you interested in them?"
Although the Land of Hot Water was famous for its hot springs, it also seemed to have a knack for spawning strange cults, especially during times of war. Some of these groups, like the Hot Water Village, could wield surprising influence, rivaling even Amegakure.
"If you hear anything about them, Yashiro-san, please let me know."
The ability of immortality...
Even Jin craved it.
If he could decipher that power, perhaps he could also obtain it.