The first requirement for mastering the Lightning Release Secret Technique is to cultivate the Nature Transformation of the lightning attribute, and to control it to a high level.
Uya was born with the ability to Chakra Nature Transformation, so this step was relatively simple for him.
As for Nature Transformation, it was not difficult for Uya.
After all, Uya's Chakra reserves have reached the Jonin level, which fully meets the standards for training in Chakra Nature Transformation. Moreover, Uya's control over Chakra is far beyond what ordinary people can match.
It didn't take long for Uya to easily master a high level of lightning-attribute Chakra Nature Transformation.
At this point, even if Uya wanted to develop Chidori, it wouldn't require too much effort.
However, Chidori requires Hand Seals, as does the upgraded version of Lightning Blade, making it unsuitable for Uya. Uya only cultivates lightning attribute to use it for body tempering.
The lightning-attribute body-forging Secret Technique was easier to cultivate than Uya had imagined. Perhaps it was because Uya's body was already incredibly strong and could easily withstand the cellular activity stimulation of lightning.
This training not only improved his physical strength but also greatly enhanced Uya's neural reflex speed, which is his physical speed.
Moreover, as his cultivation deepened, the speed of enhancement was not just a little bit; it almost doubled Uya's speed!
If Uya's previous Void Air Shatter Continuous Flash could only stack three oscillations from three directions simultaneously, now Uya can do it five times!
Of course, this five times is also the limit. No matter how fast Uya's speed increases, the Power of Tremors cannot exceed the limit of five times in an instant.
After all, the Power of Tremors is not a force of speed; it is a force of straightforward, head-on crushing.
In addition, the further enhancement of his physical strength also made Uya's Power of Tremors much stronger.
A full-force punch imbued with Monstrous Strength could easily shatter even high-level A-rank Ninjutsu.
Even without the added Monstrous Strength, a normal punch is powerful enough to break through a mid-level A-rank Ninjutsu.
For Uya now, without stacking Monstrous Strength, it's just a normal punch; with stacking Monstrous Strength, it's a serious punch.
After Uya's Chakra level reached Jonin level, the consumption of using Monstrous Strength was greatly reduced.
The body-forging Secret Technique of Lightning Release brought Uya a slight, all-around enhancement.
Although he hadn't finished cultivating the First Stage, Uya was already looking forward to the Second Stage and possibly the Third Stage, and was thinking about when he must make a trip to the Land of Lightning.
After spending a month cultivating nearly half of the First Stage, Hiruzen Sarutobi's order finally left Uya with no way to refuse.
Uya had previously received missions for secret infiltration and assassination, but he had postponed them for a while because he needed to train in the Lightning Release Secret Technique. Now that the Second Shinobi World War was getting more and more intense, he could no longer postpone them.
Moreover, one can cultivate even while carrying out a mission.
Uya's mission was unique; instead of wearing a mask and cloak, he was to disguise himself as an ordinary person from the Land of Rain and infiltrate the Land of Rain directly.
Uya had several targets, including many Elite Jonin from Amegakure, and even Hanzo of the Salamander!
However, Hanzo of the Salamander was definitely ignored by Uya. This boss was left for Konoha to deal with, or perhaps he could team up with the Sannin to fight him later.
Anyway, you won't lose any equipment if you solo it.
Besides the ninjas of Amegakure, who were also Uya's assassination targets, the Jonin of Iwagakure and Sunagakure were also among Uya targets.
Furthermore, Uya also had the task of gathering intelligence.
Almost all aspects of the mission are combined into one, which is the mission of Uya, Special Anbu. Of course, precisely because of this, Uya is extremely free and can use any method he wants to complete the mission.
Soon, Uya packed up and left Konoha's camp.
Ultimately, he chose to follow the mission's instructions, first disguising himself as an ordinary citizen of the Land of Rain, then infiltrating the Land of Rain, and then deciding on his next move based on intelligence or by gathering information himself.
Uya still wanted to take this opportunity to see if he could obtain information about the Kusanagi Sword that had fallen into the hands of the Sunagakure ninja, and then find a chance to seize the Kusanagi Sword.
Not long after Uya left, in a secluded underground location within the Konoha camp, a Root ninja was reporting to Danzo.
Danzo his eyes, his gaze flickering uncertainly.
"He left the camp alone, and without a mask or cloak... What does this mean? Is it Hiruzen Sarutobi's secret mission?"
"But why send that brat Uya to carry it out, and why specifically bring him into that department?"
As the Hokage's Danzo, Danzo did not have the authority to mobilize the Anbu, but he did have the authority to view the Anbu's information and intelligence.
However, within the Anbu, there is a special department whose information even he cannot access. The number of people in that special department is currently a mystery; all that is known is that it exists, but no information can be obtained.
Only two people knew about that special department: Hiruzen Sarutobi and Hatake Sakumo.
Since Uya was transferred to Hiruzen Sarutobi's unit, all information about Uya has been kept top secret, and even Danzo had difficulty knowing what had happened to Uya.
So even now, Danzo is still a bit confused and can't understand Hiruzen Sarutobi's intentions. In his opinion, Uya is not qualified to enter that special department at all.
Even though Uya has extremely high talent, he hasn't grown up yet.
Perhaps it was Hiruzen Sarutobi's way of better protecting Uya before he fully matured.
Thinking this, a cold glint flashed in Danzo's eyes.
"In that case, you might as well hand him over to me, Sarutobi."
After muttering something, Danzo gave an order, and two Root ninjas immediately appeared in front of Danzo.
" Nara Shikachi, Kurama Yasō, you two are the most skilled control-type ninjas. Now go and bring Uya here, and make sure he's alive."
"Yes!"
Two masked Root ninjas bowed to Danzo, and then Nara Shikachi carried Kurama Yasō on his back and left in an instant.
Watching the two leave, Danzo slightly. " The Kurama Clan's bodies have a serious problem. Even though Orochimaru tried to strengthen them with external force, it seems he still failed."
"It's a pity that the Yamanaka Clan's ninja died a few days ago. Otherwise, having the Yamanaka Clan's ninja cooperate with Shikachi have been the best option. It seems I'll have to go to the Yamanaka Clan again."
Thinking of this, Danzo thought of Uya again. Anyway, this was a battlefield, so it was normal for a few people to die.
Once Uya is under his control, Uya can actually infiltrate Hiruzen Sarutobi's Anbu, that special department.
Furthermore, with Uya's unique, near-perfect Kekkei Genkai, Uya will undoubtedly become his most useful tool.