After leaving the temple and returning to the castle.
Tongren could still remain calm, but Toneri was already impatient. "Lord Aizen, shall we begin the treatment now?"
Aizen smiled. "Shall we begin now?"
Though Tongren remained composed, he too felt a quiet excitement stirring inside. Even if his condition couldn't be cured, being able to see the world again would still be a gift.
Aizen first erased the consciousness from the extracted Byakugan, then gently implanted one into Tongren's pitch-black eye socket.
In the ninja world's simple swap-and-use system for eyes, there was no need for complicated surgeries to ensure the transplanted eyes remained functional.
Tongren whispered as he slowly opened his eyes. "So this... is what the world looks like?"
Then he looked down at Toneri, as if trying to burn his image into his heart.
Toneri couldn't help but ask, "Father, is your condition cleared up?"
"My condition?" It was only then that Tongren thought to check himself, sighing slightly. "Still not— Wait..."
Hearing his father's sigh, Toneri's mood plummeted—but upon hearing that "Wait," he felt hope rekindling. "Father, what is it?"
"This Byakugan seems different from the ones recorded by our ancestors. It just absorbed a sliver of solar energy!" Tongren said in awe. "Moreover, it seems to have reacted with my chakra, undergoing transformation. The spread of my illness has also been halted!"
Aizen, however, wasn't surprised. From his past life, he did recall that Byakugan born from a shattered Great Tenseigan could absorb solar energy.
Even the pattern inside Toneri's Tenseigan was shaped like a sun.
"Woah! That's amazing!" Toneri didn't focus on the transformation itself—he was just thrilled to hear the disease had stopped spreading.
Tongren's transformation didn't last long, ending shortly after it began.
When he opened his eyes again, they appeared somewhat brighter than before.
"So it's still Byakugan after all?" Aizen wasn't surprised by this result. Even if he had deliberately chosen among countless Byakugan for one of the purest, with Tongren's bloodline, evolving into a Tenseigan was practically impossible.
As for Tongren himself, he hadn't even considered the Tenseigan at all. Upon sensing the change in his eyes, he excitedly said, "My eyes... Yes! This must be the [Solar Byakugan] described by our ancestors!"
"[Solar Byakugan]?" Aizen asked slightly surprised.
Tongren nodded firmly, "It's an evolved form of the normal Byakugan... It must've been the power of the Great Tenseigan that transformed the Byakugan's original ocular ability!"
"Could it be on par with the Mangekyo Sharingan then?" Aizen asked with growing interest. "Tongren, what ability does your eye currently have?"
Tongren concentrated, sensing the change. "My left eye hosts the power of Amaterasu [the Sun Deity of ancient myth]. Any damage I take in the next minute gets completely canceled. The cooldown is ten minutes, but if I soak up a lot of solar energy fast, the cooldown time shortens too!"
"A full minute of invincibility?"
Aizen raised an eyebrow. Judging from the description, this might be similar to Izanagi, a technique usable even with the Three Tomoe Sharingan.
However, Izanagi is extremely taxing on the eyes. Even if you slaughtered the entire Uchiha clan for their eyes, you might only get a few dozen minutes of use. It's nowhere near Amaterasu [the Sun Deity of ancient myth], which can be reused and even has reduced cooldown times.
Tongren continued, "As for the right eye, the power residing within it is called Kashitsukihiko no Kami [Misfortune Deity]. When activated, it brings misfortune to others! When both eyes are activated simultaneously, it summons Susano'o no Mikoto!"
Regarding the first two abilities, Tongren himself wasn't particularly satisfied. One was purely defensive while the other was mystical and vague—neither possessed powerful offensive capabilities. Fortunately, the final ability, Susanoo, seemed quite formidable.
As for Aizen, he wasn't particularly interested in Susanoo. In fact, he had approached this entire inquiry rather casually from the beginning.
With his current strength, even abilities on the level of Mangekyo Sharingan or Solar Byakugan provided him with practically negligible assistance. He would have been more interested in something like Rinnegan or Tenseigan.
However, Tongren's eyes offered Aizen a rare, unexpected surprise.
The ability to bring misfortune to others with Kashitsukihiko no Kami was unprecedented in his knowledge throughout the history of shinobi no sekai.
Compared to powerful offensive techniques, he actually valued this supportive ability more.
If properly utilized, it might actually prove useful even in battles at his level!
Thinking about this, Aizen asked, "Tongren, does Kashitsukihiko no Kami have any limitations?"
Tongren hadn't expected Aizen to ask about the very ability he considered weakest. After a brief hesitation, he quickly replied, "A gray beam will shoot from the right eye when using Kashitsukihiko no Kami. It only activates upon hitting the target, lasts for one hour, and cannot be used again until a month has passed!"
Aizen nodded slightly and secretly mused, "So it requires a direct hit to activate. That pairs perfectly with the first ability. Activate the invincibility ability first to dodge attacks and force opponents to use their skills, then utilize Kashitsukihiko no Kami!"
After a brief pause, Aizen smiled at Toneri. "Toneri, you must be impatiently waiting, right?"
Toneri nodded vigorously. "I really want to witness my father and Lord Aizen in action!"
"Rest assured, you'll see them soon enough!" Aizen said as he implanted the purest pair of Byakugan he had into Toneri's eye sockets, watching expectantly for Toneri's reaction.
In the original storyline, Toneri had awakened the Tenseigan by combining Hanabi's Byakugan with his own Otsutsuki chakra. Aizen specifically selected the purest Byakugan available across a thousand years; there was no reason it shouldn't surpass Hanabi's!
Under Aizen's anticipatory gaze and Tongren's nervous stare, Toneri's Byakugan began to glow, transforming into another form.
"This is the Tenseigan!" Tongren shouted in disbelief. "How is this possible? He has awakened the Tenseigan independently, just like ancestor Hamura!"
Hamura, their branch family's ancestor, had needed to fuse all the Byakugan of his clan to evolve into the Tenseigan!
"This chakra..." Aizen was somewhat shocked as well. "Has he regressed to the level of Hamura? Aside from lacking the eyes, his body is practically a pure-blooded otsutsuki!"
Madara Uchiha was already immensely powerful, and after obtaining Hashirama Senju's cells and eventually awakening the Rinnegan in his later years, he became the best result Black Zetsu had ever achieved over the past millennium.
But look at Toneri—after acquiring the Tenseigan, he immediately underwent a transformation.
Such talent would surely make Black Zetsu weep with jealousy if he ever found out!
Both were still reeling when Toneri suddenly clutched his eyes and cried out in pain, "Agh! It hurts!"
"The transformation of the Tenseigan is consuming too much chakra, overwhelming his body?" Aizen instantly understood and quickly placed a seal on Toneri with blazing speed!
As the pressure from the Tenseigan transformation subsided, Toneri's body went limp and he collapsed into Tongren's arms.
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