"Caja Negación?" Toshiro said with some surprise.
"Yes, [Caja Negación] are some small things I created using the Hogyoku. They can seal spiritual bodies within a dimensional space. The duration of the seal is determined by the Reiatsu of the sealed individual. The stronger the Reiatsu, the shorter the sealing time. So, for those with powerful Reiatsu, its effect is actually not too significant. Therefore, I originally intended to give them to the Espada under my command to use for punishing their subordinates who made mistakes. However..."
"...while I was mass-producing [Caja Negación] to give to my subordinate Espada, a chance accident occurred, and I actually produced a Super Caja Negación with power over ten times greater than normal. The Super Caja Negación can even permanently seal existences below the rank of Cuatro Espada within a dimensional space."
"As for existences above the Cuatro Espada, although they can break out using their own power, it would require continuously bombarding the Super Caja Negación from the inside with their Reiatsu for at least ten days to break it."
"Well, of course, for existences at my level or yours, Hitsugaya-kun, the Super Caja Negación is still just a small trinket. At most, it can barely trap us for a few hours. However, under normal circumstances, being trapped for a few hours is naturally not a big deal. But at some critical moments, a few hours is already enough to do many things..." Aizen said with a meaningful smile at the corner of his mouth.
"Aizen... you bastard..." Hearing Aizen's words, Toshiro's expression turned grim.
If Toshiro were truly trapped here for a few hours, and Aizen took the opportunity to launch a decisive battle against Soul Society, then Soul Society's chances of victory this time would be greatly reduced, and they might even suffer a crushing defeat.
In the original work, after the Gotei 13 was wiped out, Ichigo relied on his cheat plot armor to defeat Aizen and save the world. But in this life, due to the butterfly effect of Toshiro, even Ichigo had been hypnotized by Aizen's Kyoka Suigetsu.
So, even if Ichigo in this life could still master the [Final Getsuga Tensho] and surpass Aizen in combat ability, while under the hypnosis of Kyoka Suigetsu, he probably still wouldn't be able to do anything to Aizen.
'I absolutely cannot be trapped here!' Toshiro thought to himself.
Thinking this, Toshiro immediately let out a loud shout, his figure flickered, and he charged towards Aizen.
Aizen was also currently within the dimensional space formed by the Super Caja Negación. If Toshiro could defeat or entangle Aizen here, then Aizen also wouldn't be able to get out, and naturally couldn't use the time Toshiro was trapped to launch a decisive battle against Soul Society.
However, seeing Toshiro charging at him with murderous intent, Aizen seemed to have anticipated it, showing no panic or surprise.
Just as Toshiro got close and punched at Aizen, Aizen suddenly leaned to the side, dodging Toshiro's attack.
And as Aizen dodged to the side, a figure suddenly sprang out from where Aizen had been, tightly wrapping its limbs around Toshiro's body.
"What?! Phoenix?!!" Toshiro exclaimed in shock.
This suddenly appearing figure was none other than Phoenix Margela, the Arrancar Aizen had specifically created to seal Toshiro's Hyorinmaru.
"Heh, Hitsugaya-kun, do you know why I specifically accompanied you into the dimensional space of the Super Caja Negación? Because I knew that after you realized you might be trapped in the dimensional space, in your desperation, you would definitely attack me first, to prevent me from launching a decisive battle against Soul Society while you were trapped in the dimensional space. But... the moment you lost your composure... you had already lost." Aizen said with a light laugh.
Having said that, a black spatial tunnel appeared behind Aizen. Judging from the bright moonlight shining in, the other end of the tunnel was the scenery of Hueco Mundo.
"Well then... sayonara, Hitsugaya-kun!" Having said that, Aizen lightly stepped back, his body drifting casually backwards, going directly through the black tunnel towards Hueco Mundo on the other side.
After Aizen entered the black tunnel, the black tunnel began to shrink on its own. At the same time, a dazzling light suddenly lit up from Phoenix, who was entangling Toshiro.
"Ha!"
Toshiro let out a loud shout, exerting all his strength trying to break free from Phoenix's entanglement. However, even as Phoenix's bones broke and sinews tore, he did not loosen his grip on Toshiro.
And with Phoenix's fearless sacrifice, Toshiro couldn't break free from Phoenix's restraint for the time being.
Boom!
When the black tunnel completely closed, and the dazzling blue light reached its extreme, an immensely powerful ice-cold force erupted from within Phoenix's body.
…
Hueco Mundo.
Rumble—!!!
The space shook, and then pitch-black cracks appeared in the air like a spiderweb, as if it were a cracked mirror.
"What terrifying power. I didn't expect Flame Child to unleash such a dreadful attack after absorbing so much of Hitsugaya Toshiro's ice-cold power. I'm afraid even I would be dead or severely injured if I had to directly endure such a dreadful attack head-on." Aizen, who had just returned to Hueco Mundo from the dimensional space, looked at the cracks densely packed like a spiderweb in the void and couldn't help feeling a bit of lingering fear.
"However... Flame Child absorbed ice-cold power. Although it would form extremely terrifying power when released in an instant... the essence of this power is still 'ice'. And Hitsugaya Toshiro, as the owner of the Strongest Ice-type Zanpakuto, has great immunity to ice-based attacks. So, even if such terrifying power were released in an instant, it I'm afraid wouldn't be able to truly severely wound or kill him." Aizen frowned, pondering.
Toshiro's ice-cold power was different from Yamamoto's flame power. If a large amount of flames from Yamamoto's Ryujin Jakka were absorbed and then released in an instant, it afraid would form a devastating explosion that could destroy the world.
In that case, even if Yamamoto had strong immunity to fire attributes, he would not be able to escape unscathed, because an explosion is not the same as flames. So, Yamamoto, who could largely immunize against fire-based attacks, could not immunize against explosion-based power.
However, if a large amount of ice-cold power is released in an instant, it will not explode, nor will it change its 'ice attribute'. It will only instantly freeze everything around it.
Therefore, even facing the same situation, Toshiro, who has great immunity to ice-based attacks, would not be killed by the terrifying power formed by the instant release of a large amount of ice-cold power.