The total number of souls existing in the three worlds— the World of the Living, Hueco Mundo, Soul Society —remains constant; any excess souls created for various reasons are considered an overflow.
If the number of souls in Soul Society is already saturated, then even if the Soul Reaper performs a soul burial, those souls will not be accepted by Soul Society when passing through the Dangai, and will ultimately be devoured in the Dangai.
The devoured soul separates from the main soul, and the body exists as a 'Blanks' without memories. After accumulating enough 'Blanks', it forms a space called 'Valley of Screams'.
The main soul also fused within the Valley of Screams space, forming a collection of memories called the 'Memory Rosary'.
Not all of them were overflowing souls; some souls had committed serious crimes in the Seireitei and were banished to the Dangai by the Central 46.
The Dangai between Hueco Mundo and the World of the Living Soul Society is different. When fallen souls, called Hollows, pass through the Garganta, their footing is unstable, causing them to be swallowed by the turbulent currents, either falling endlessly or being torn apart on the spot, ultimately unable to maintain their form.
Until it was captured and absorbed by Valley of Screams, becoming the cornerstone of that space— Blanks.
As for why Zero didn't lose his memory, it's mainly because his soul is too strong. Especially now that he has subdued the Hōgyoku, the Reishi structure of his body is as solid as metal. It's simply impossible for this Valley of Screams Space to devour and transform him.
Zero was trying to find a way out, but no matter how she looked around, there was no way out... Outside the Valley of Screams was endless darkness, and if she jumped out, she would probably continue to fall as before.
Even with the wings he gained through Bankai, he couldn't fly. The void outside the Valley of Screams was devoid of air, and no matter how much Zero flapped his wings, he could only glide.
This is not Hueco Mundo or Soul Society. The drifting Reishi are so chaotic that they do not form objects or air, and even zero is difficult to condense, so he cannot fly.
"It's a tricky rule, but it's not a big problem. I can't figure it out, but you surely can! Come on, let me out."
Zero pulled open his tattered clothes, revealing a slightly unrestrained air. The Hōgyoku was embedded in his chest, positioned in the center of an Hōgyoku -shaped red pattern, the pattern being the same red color as Zero's Reiryoku.
'I'm accelerating the growth of this space, expanding it until it connects with Hueco Mundo or the World of the Living...'
The Hōgyoku responded with a thought to Zero; at this moment, it truly became an accessory, only able to help Zero realize all his desires.
This Hōgyoku has evolved quite perfectly, and it is already capable of independent thought. It even wants to take over Zero's body and become a superior being.
Zero stopped trying to escape and instead began to calmly sense the Reishi energy of this space. He picked up the Blanks to observe them, hoping to gain something useful from them.
Zero already knew that Yanis had been expelled from his body by the Hōgyoku, but the Hollow power remained within him. Zero used the Hollow's devouring ability to consume these Blanks in large quantities, but he did not feel any improvement in his power.
At this moment, Aizen and his group know of sixteen Valley of Screams. The largest Valley of Screams has become Aizen's base. He constantly has people use Chains made of Blanks to pull other Valley of Screams together, causing them to collide and merge.
This is also one of the ways that Aizen transformed the Valley of Screams Space and allowed it to continue to grow.
If it weren't for the observation that zero appeared in the Valley of Screams coded as 'sixth', it might have already become part of Aizen's headquarters.
Nangong Ling is an existence beyond compare. His 'Zanka no Tachi' is powerful enough to destroy the world, yet it still cannot kill him. Aizen estimates that even the force generated by the collision of two spaces would not be enough to kill Nangong Ling.
Therefore, they had no choice but to abandon the Sixth Valley of Screams and instead move towards the 'New World,' Valley of Screams that resembled a war fortress, and continue their advance within the Dangai to devour the Seventh Valley of Screams space.
With millions of years of accumulated souls, there are more than just a dozen or so valleys Valley of Screams. In the deeper and more distant Dangai, there are other spaces. Aizen and his group don't care about abandoning this one.
But just two months later, the monitoring office sent a report to Aizen that the 'Sixth Valley of Screams' where Nangong Ling was located was expanding wildly, at a rate more than a thousand times faster than before.
Various souls shone brightly in the void of darkness, all of them being frantically drawn and pulled towards the 'Sixth Valley of Screams'. Other Valley of Screams, also located within the boundary between Hueco Mundo and the World of the Living Dangai, could only occasionally receive a few fallen souls...
"Can you calculate how long it will take for the 'Sixth Valley of Screams' to grow to the point where it breaks through the Dangai?"
Aizen arrived at the inspection room to question Nangong Ling, who was carefully cutting up the Blanks Nangong Ling on the monitor with a calm expression.
As clever as Aizen, he quickly guessed Nangong Ling was planning after a little thought... He wanted to make Valley of Screams grow so large that it could connect the Dangai between the World of the Living and Hueco Mundo, and then use it to escape.
"Please, please give me ten minutes."
The technician was sweating profusely, with the boss standing behind him; you can imagine the immense pressure he was under.
"Get out of here!"
Kagerōza Inaba circled around from behind Aizen, kicked the technician away, and took over the operation himself. A minute later, he said:
"The Sixth Valley of Screams will be able to connect the World of the Living and Hueco Mundo in about five years and three months. The Memory Rosary will appear in the third year and one month. Nangong Ling can use the spatial passage opened by the Memory Rosary to leave at that time."
Aizen nodded, but fell into deep thought: ' The Sixth Valley of Screams hasn't produced Memory Rosary yet; it's not mature enough. How did this guy manage to grow so quickly? Reiryoku shouldn't be having any effect. The only thing that could possibly influence him is... the Hōgyoku!'
' Nangong Ling has already mastered the Hōgyoku? Damn it, that Hōgyoku should have been mine... If he appears, he will continue to disrupt my plans. Considering that this being is impossible to kill, perhaps now is the time to seal him away.'
Aizen's expression remained calm, Kagerōza Inaba's forehead was beaded with sweat. Aizen enjoyed toying with his subordinates, and Inaba feared Aizen would assign him an impossible task...
"Lang Zuo, have 'New World' turn around and aim at 'Sixth Valley of Screams,' then Kidō Cannon. Let Nangong Ling be completely lost in this Dangai!"
As Aizen turned and left, he gave Kagerōza Inaba a new order. From initially ignoring him to responding, Nangong Ling had repeatedly made Aizen feel that she was troublesome and difficult to deal with.
The Valley of Screams they inhabited was named "New World," the meaning of which couldn't be clearer: this was the world belonging to Aizen and his companions; it not only Blanks, but also "Kidō Cannons " fueled by Blanks.
Based on the current power calculations, a single shot could destroy one square kilometer of the Seireitei, which is one hundred square kilometers.
Aizen originally intended to use it against the Soul King Palace in the sky, but it wouldn't hurt to test its power a bit more now. He could already picture Nangong Ling's furious expression...
A somewhat mysterious Reishi appeared, with eighteen normal people standing around it, each forming incomprehensible hand seals. Then, an oval barrier shot into the sky, like a cannon barrel.
The Reishi particle array, like the primer of Bullet, charged up energy for half a minute before unleashing a powerful energy projectile that shot skyward toward the 'Sixth Valley of Screams'...
On the Sixth Valley of Screams side, Zero's research on the Blanks over the past two months has finally yielded some results.
Because the Blanks lacked self-awareness, Zero thought of using Reiryoku to create very weak Modified Souls, which were then injected into the bodies of the Blanks through the Kidō. These Blanks actually craved more Modified Souls.
Zero's 'Artificial Soul Technology' was crude, but it was successful. He had learned this technique from the materials in the Great Spirit Book Gallery.
According to the information, this technique in the hands of Kirio Hikifune can no longer be called a technique, but rather Reishi Arts... The specifics are not yet recorded in the information.
Just as Zero was overjoyed, something resembling the atmosphere in the sky was torn apart, and Zero instantly increased his Reiatsu to resist.
His suddenly increased Reiatsu was like a wall of steel, and the incoming 'Kidō Cannon' could not penetrate it at all, only spreading out and destroying the areas outside the coverage of his Reiatsu.
Centered on zero, a circular area with a radius of ten meters was protected by Reiatsu, while the area outside was completely erased.
Seeing that the Valley of Screams where he stood had transformed into a round, cylindrical pillar, Zero's face turned ashen, and he laughed in fury, "Ha, although I don't know who you are, you're really courting death!"
Zero raised his hands and condensed a Giant Hollow Cero with a diameter of over ten meters. Red lightning struck wildly, its concentration twice as strong as Ulquiorra's Black Cero. This was his full power.
The red Cero, moving at the speed of light, retaliated against the opponent who was invisible in the void.
Boom! Sizzle!
Despite the vast spatial turbulence, Zero could still hear the muffled rumbling sound coming from the other side. Regardless of whether the first shot hit or not, Zero was already preparing the second...
"Is this... is this even an attack a human being could launch?"
Kagerōza Inaba was dumbfounded. Not only had their 'Great World' fortress developed for so long, but it was also protected by three layers of Kidō, yet those Kidō were as flimsy as paper.
The edge of the 'New World' that was Cero was instantly blown away in a huge chunk, even worse than their Kidō Cannon from before.
"Inaba Kage, the second one is here."
"How could it be so fast!"
Boom!
"The third shot."
"Withdraw! Withdraw quickly!"
The largest Valley of Screams space began to shift from the location where the Kidō Cannon had just been fired, dodging the subsequent Giant Hollow. Kagerōza Inaba a wave of fear.
The 'New World,' which had been painstakingly expanded over the years and was now two hundred square miles in size, had been blasted away by humans, losing one-fifth of its area. Fortunately, it wasn't blasted into the center, or it would have been completely destroyed.
On the balcony, looking at the three large holes that had appeared in the New World, Aizen's face was gloomy, but then he chuckled and muttered to himself, "Hmph, this loss is nothing, it can be replenished quickly. But you, I wonder how many years it will take you to escape the Dangai."
He turned and entered the palace, arriving at the underground Hall, where countless figures, all mindless Blanks, were crowding towards the center, while those in the Blanks were constantly being absorbed as white Reishi...
What absorbed them was the Hōgyoku, a flawed re-creation by Aizen.
At this moment, a still statue held it in its palm, while the Blanks kept approaching, not caring even if they were absorbed by the Hōgyoku.
The reason why the Blanks could do this was because the statue was a collection of memories born in this space— the Memory Rosary.
The instincts of the Blanks drive them to relentlessly pursue the Memory Rosary, in an attempt to reclaim their past memories.
Unable to obtain a complete Hōgyoku, Aizen also made use of it in order to achieve the Hōgyoku's perfect form.
Even the Blanks still souls. The Hōgyoku can devour them, and with millions of years of accumulation, their numbers are numerous enough to potentially feed the Hōgyoku and cause it to evolve.