"That's correct. You should know how immense the power of beings like us is."
"When you broke through before, you caused such a huge commotion. If you hadn't promptly reacted and restrained your Reiatsu, continuing further might have risked freezing the entire Seireitei, even the Soul Society."
Yamamoto said gravely.
"Not to mention, if we were to fight at full strength, even the aftershocks would cause catastrophic damage to the Soul Society."
At this point, Yamamoto couldn't help but think of his battle with Yhwach a thousand years ago.
Although Yamamoto won that battle, the entire Soul Society was left devastated by their fight.
Therefore, Yamamoto naturally wouldn't engage in combat with Toshiro within the Soul Society.
"Then where will we duel?"
Toshiro asked.
"Dangai!"
Yamamoto replied.
"Dangai?"
Toshiro was surprised.
As a Shinigami, Toshiro knew about the Dangai.
The so-called [Dangai] refers to a space where several layers of severed space overlap, surrounded by torrents of time.
The density of time inside is much higher than the outside world, so time flows much faster. Converted to numbers, it's roughly 200 times faster.
Meaning, if one year passes outside, 200 years would have passed inside the Dangai.
Simultaneously, the Dangai is both a passageway to the Living World and a place of exile. In the Soul Society, if someone is sentenced to exile, they are banished to the Dangai.
Moreover, within the Dangai, there exist the Koryu and the Kototsu.
The Kototsu and Koryu drag everything they engulf into endless temporal eddies, never to return.
And once encountering Kototsu, temporal confusion can easily occur.
Toshiro remembered that after the plot began, when Ichigo and his group broke into the Soul Society to save Rukia, they encountered Kototsu.
Their encounter with Kototsu also caused changes in their arrival time in the Soul Society, leading Ichigo and the others to initially miscalculate the remaining days until Rukia's execution.
In short, Koryu and Kototsu within the Dangai are extremely dangerous entities.
However, if one is powerful enough, encountering the Koryu and Kototsu isn't a big deal.
Toshiro recalled in the original work, during the final battle with Aizen, Aizen also encountered Kototsu, but he casually obliterated them.
Though at that time, Aizen had already fused with the Hogyoku, greatly enhancing his strength. So Toshiro wasn't sure if he could do the same now.
But regardless, the Dangai is an undoubtedly perilous place.
Yet for high-level combat with Yamamoto, it's quite suitable.
The countless fractured spaces and various chaotic flows within the Dangai ensure that even if Toshiro and Yamamoto fought at full strength, there's no need to worry about affecting the Soul Society.
Yamamoto said: "Although the Dangai is a very dangerous place, for Shinigami of our level, it doesn't pose too much trouble. Moreover, fighting within the Dangai means we don't have to worry about causing harm to the Soul Society. That's why I chose it as the battlefield."
"And the Dangai has also been used for testing the power of Bankai."
Yamamoto added.
"Testing Bankai power?"
Toshiro asked, puzzled.
"Yes. You should know that some Captains' Bankai are extremely dangerous, not only immensely powerful with wide area of effect, but also prone to harming allies. Such Bankai are generally not permitted for use within the Seireitei. To test the power and danger of such Bankai, their owners are made to unleash their Bankai at full strength within the Dangai for evaluation and analysis."
Yamamoto explained.
"I see."
Toshiro understood.
At this point, Toshiro also realized why some Captains of the Gotei 13 didn't use their Bankai even when facing powerful enemies. Their Bankai were simply too dangerous, easily harming their own comrades.
"Alright, enough talk. Let's go, Toshiro."
Yamamoto said.
"Yes, Genryusai-sensei."
Toshiro nodded.
Then Toshiro followed Yamamoto out.
Finally, Yamamoto stopped before a Senkaimon within the 1st Division.
He explained to Toshiro: "This Senkaimon was specially prepared for this purpose. However, it doesn't lead to the Living World or Hueco Mundo. It specifically leads into the Dangai. Entering it will take us directly to the Dangai."
Toshiro had only seen Senkaimon leading to the Living World or Hueco Mundo before. This was his first time seeing one leading into the Dangai.
Moreover, most Senkaimon are reinforced to prevent accidents and getting lost in the Dangai.
"Well, let's go in."
With that, Yamamoto stepped in first.
Toshiro followed closely behind.
After entering the Senkaimon, Toshiro felt a momentary blur before arriving in the Dangai.
Toshiro carefully observed his surroundings.
He found himself in a dim, chaotic space with various turbulent flows. The danger level was far beyond what ordinary Shinigami could withstand.
Standing opposite Toshiro, Yamamoto spoke: "Then… let the battle begin! Toshiro!!"
Hearing this, Toshiro's heart tensed. He stopped surveying the surroundings and focused his full attention on Yamamoto.
However, Yamamoto didn't immediately attack. Instead, he began by releasing his Reiatsu.
Boom!
An immense, surging Reiatsu like a vast ocean pressed towards Toshiro.
Feeling Yamamoto's Reiatsu, Toshiro couldn't help but had his expression changed slightly.
It wasn't that Yamamoto's Reiatsu was so strong Toshiro couldn't resist. After all, Toshiro wasn't a Lieutenant-level Shinigami who would be mentally crushed by Reiatsu alone.
What truly surprised Toshiro was that Yamamoto hadn't even released his Zanpakuto, yet the Reiatsu he released was already stronger than the full-power Reiatsu bursts of some Captains' Bankai.
Didn't that mean Yamamoto could defeat Captain-level experts even without releasing his Zanpakuto?
'Should I say, as expected of the strongest Shinigami in a thousand years? This strength is truly astonishing!'
Toshiro thought to himself.
'However, as an existence of the same level, I won't be inferior to you, Genryusai-sensei!!'
Then, Toshiro unleashed his own Reiatsu without backing down, meeting it head-on.
Boom!!
The mere collision of their Reiatsu caused a tremendous roar.