"Mr. Himejima Gyomei, thank you for this month's training. You've made me much stronger." Uchiha Nagi bowed to him, a gesture of genuine sincerity.
He had originally planned for half a month of training, but it ended up extending to a full month because the training he provided was simply too good.
Among the Nine Pillars, Mr. Himejima Gyomei might not be the fastest or have the sharpest attacks, but his physical body was absolutely trained to its extreme.
A two-meter-two giant, wielding a flail, he would let out a roar of "Amitabha" and smash it down, a living embodiment of an enraged Vajra.
Unfortunately, he had no enraged gaze, as he was blind. Yet, this was precisely what Uchiha Nagi admired: a person who was blind in both eyes, but whose strength had soared to the Pillar level.
In the later stages, even Muzan marveled that Mr. Himejima Gyomei's physique was the strongest human body he had encountered in several centuries.
He couldn't see, but he could perceive his surroundings, using all his senses except his eyes to assess situations. If you didn't look at his eyes, you would never guess he was blind.
"Buddha is merciful. The stronger humanity becomes, the greater the chance of eliminating Muzan. Mr. Uchiha, there is no need for thanks," Mr. Himejima Gyomei said, shedding tears and pressing his palms together.
"Speaking of which, Mr. Uchiha, you are truly astonishing. Your body can withstand such intense training, and your internal fighting spirit grows stronger each day. This is truly a blessing for the Demon Slayer Corps."
During the muscle strengthening training, Uchiha Nagi gave Mr. Himejima Gyomei too many surprises. Possessing white zetsu cells, his body's recovery ability was truly astonishing.
Moreover, through high-intensity training, Uchiha Nagi's body's potential was developed, and the white zetsu cells fully played their role, causing Uchiha Nagi's Chakra to increase day by day.
So, in his perception, it was as if the fighting spirit energy within Uchiha Nagi's body was growing stronger every day.
Little did he know, Uchiha Nagi had long been using his Sharingan to constantly analyze and copy his abilities.
"To see through and analyze the laws governing the operation of things."
The essence of this eye's ability lies in two aspects: seeing through and analyzing.
Uchiha Nagi spent a full month analyzing Mr. Himejima Gyomei's perception ability, which was halfway to reaching the Transparent World.
This ability, like the Transparent World, does not belong to a skill, so it cannot be simply copied by seeing through it. Therefore, Uchiha Nagi could only analyze it again and again.
Finally, with the help of Mr. Himejima Gyomei, he tried to abandon his strongest Sharingan dynamic vision, covered his eyes with a blindfold, and underwent special training.
After unremitting efforts, he successfully mastered the ability to fight even with his eyes closed. Uchiha Nagi couldn't help but think of Madara. After his resurrection, his Impure World Reincarnation Rinnegan shattered, and he fought a multitude of enemies with his eyes closed, completely unburdened. Had he also reached some kind of realm similar to the Transparent World?
So Madara, in battle, didn't need the dynamic vision of the Mangekyo at all. The Rinnegan was merely for its special abilities. Setting aside the Rinnegan's abilities, Madara's strength was absolutely no different whether his eyes were closed or open.
Susanoo could still be activated without eyes, and he could still fight enemies he couldn't see, even easily dodging a Flying Thunder God ambush.
This made Uchiha Nagi covet the power of the Transparent World, this realm and ability similar to the 'Heavenly Eye' of Taoism and Buddhism.
The Transparent World has different names in different worlds: the Heavenly Eye in Taoism, the Mind's Eye in Buddhism. But upon closer analysis, they are all very similar, a way of perceiving the world with one's heart.
Mr. Himejima Gyomei, having practiced Buddhism for many years and being blind, thus gained this ability. However, he is still one step away from the Transparent World. He will likely only cross this step after a truly exhaustive life-or-death battle.
"Mr. Himejima Gyomei, please hand this to Mr. Ubuyashiki. This is something I've researched. It contains production data and an introduction, and I believe it will be of great help to the Demon Slayer Corps."
Uchiha Nagi handed him a scroll. This could release its contents simply by being opened, without needing Chakra input.
"It will help the Demon Slayer Corps? That's wonderful, Amitabha. May I ask what's inside?" Mr. Himejima Gyomei asked.
"Nothing much, just a type of ultraviolet lamp," Uchiha Nagi smiled, then proceeded to explain to Mr. Himejima Gyomei.
After capturing the bald ramen shop owner and other demons, Uchiha Nagi continuously researched these vampire-like creatures.
Garlic, crucifixes, ultraviolet light, silver metals—he tried everything. Finally, he discovered that ultraviolet light was effective against them, but not enough to kill them.
The technology in this world was similar to the pre-World War I era, and ultraviolet light had not yet been invented.
But Uchiha Nagi was different; he was a transmigrator. He knew that sunlight contained ultraviolet rays. So, through a series of researches, he developed ultraviolet lamps and then experimented on the captured test subjects.
He found that ultraviolet light burned them like fire, effective but not lethal. Uchiha Nagi was helpless; sunlight contains more than just ultraviolet light, it has many types.
However, it was enough. As long as Demon Slayer Corps members below the A-rank were equipped with ultraviolet lamps, those below the Twelve Kizuki would be in for a rough time.
Before a fight even began, a barrage of ultraviolet lamps would shine like lasers, weakening them. Then, during the battle, if a few teammates continuously shone flashlights on them, it would be like having a whole team of support.
Thinking of the bullets in Genya Shinazugawa's shotgun, which were made of sun ore, Uchiha Nagi wondered what would happen if he made grenades filled with small steel balls of the same material as a nichirin blade...
After listening to Uchiha Nagi's explanation, Mr. Himejima Gyomei was so moved that he started shedding tears again. He excitedly clutched the scroll; this kind of item was simply a godsend for lower-ranked members.
The thought of not having to sacrifice so many lower-ranked members every year made Mr. Himejima Gyomei incredibly happy.
"Mr. Uchiha, you must be sent by the Buddha to end Muzan. I have a premonition that Muzan will be completely eradicated by the Pillars of our generation."
"Haha, you're too kind. Well, I'll be going now. Oh, by the way, I still have one more thing I'd like to entrust to you," Uchiha Nagi said.
"Please speak—"
"Could you please tell Mr. Ubuyashiki to help me locate the grave of Yoriichi Tsugikuni, the founder of Sun Breathing? If it can be found, I might have a way to finally end Muzan when I return—"
Subsequently, Uchiha Nagi disappeared from Mr. Himejima Gyomei's perplexed perception. He used the Body Flicker Technique to leave, and after traveling a certain distance, he stopped.
"Let's begin. This time I have close to 6 or 7 cards of Chakra. I shouldn't pass out from exhaustion," Uchiha Nagi muttered to himself.
Then, with a whoosh, he silently vanished from this world.