Starting with Kengan beating up the Pirate King

Chapter 253 The Final Boss
As the battle at the Soul King's Palace draws to a close, a new battle is about to unfold in the Seireitei.

Blood dripped from the tip of Aizen's sword as he walked out of the deathly silent Research and Development Bureau. Several spiritual pressures were approaching from afar, causing a smile to curl at the corner of his mouth: "Have you noticed? Too late. There are no longer any obstacles in Soul Society that can stop my subordinates from descending."

He raised his hand, his fingertips tracing a path through the void, and a pitch-black rift suddenly exploded outside the Technology Development Bureau. Within the rift lay a desolate desert landscape with endless yellow sand, from which a mournful howl emanated—the unique gale of Hueco Mundo, carrying with it the chilling roars of ferocious beasts.

"Come out, my men." Aizen's voice carried an undeniable authority.

The next moment, countless figures emerged from the crack!

Leading the group was Nnoitra, who carried a massive scythe, his arrogant laughter reverberating through the air. Also present was Tia Harribel, surrounded by a surging, water-like spiritual pressure, her icy gaze fixed on the direction of Seireitei, her expression indifferent.

Stark, looking worried and troubled, hid in a corner, while Nel, who had been recalled, frowned.

Apart from Ulquiorra, who stayed behind to guard the base, all the remaining powerful members of the Espada were present, and countless Hollows of the level of Gillian and Adjuchas followed behind them. The dense black shadows almost instantly filled the entire Research and Development Bureau!

This ethereal, almost completely undisguised, violent spiritual pressure instantly spread throughout the entire Seireitei, causing all the Shinigami to turn their heads in horror.

"That is……"

"How is this possible?!"

"Why are there so many illusions?!"

Those captains, including Kyoraku Shunsui and Soi Fon, who had sensed something was wrong when Aizen slaughtered the members of the Technology Development Bureau, stopped in their tracks and looked grim as they rushed toward the bureau from the direction of the Fourth Division.

"Something really did happen."

"A Hollow? Is it Aizen?!"

The next moment, their spiritual pressure intensified, and they quickened their pace to head in that direction.

In front of the Research and Development Bureau, Aizen gently waved his arm forward: "Go, our goal is to destroy the Seireitei and the Gotei 13. Today, you can slaughter to your heart's content!"

Swish!Swish!Swish!
Without a response, the several Arrancar, their blood boiling, vanished almost instantly as they sensed and faced the spiritual pressure emanating from the captains.

Before long, the sounds of fighting, explosions, and collisions of spirit particles echoed throughout the Seireitei, and countless Shinigami were forced into close combat with Hollows before they could even react.

The members of the Third Division had just rushed out of the barracks when they were blasted into pieces by several Cero attacks from Gillian.

Just as Byakuya Kuchiki was about to provide support, a powerful spiritual pressure came from afar. Nnoitra swung his scythe and leaped in, the two swords clashing and creating waves of violent energy.

As soon as Kyoraku Shunsui and Soi Fon arrived near the entrance of the 12th Division, they were blocked by Harribel's water barrier. Stark leaned against the wall and made a Cero gesture towards Kyoraku Shunsui.

Despite their formidable strength, the captains of the Gotei 13 were overwhelmed by the combined attacks of the Espada and countless Hollows.

Having experienced fighting the Wandenreich, Soul Society reacted quickly. The announcement from Tenten Kōra soon echoed in the sky above Seireitei, and the Shinigami began to organize a counterattack, turning the entire Seireitei into a bloodbath!
Meanwhile, Aizen had already slowly walked out of the Technology Development Bureau.

He walked along the main road of Seireitei, the stone slabs beneath his feet corroded by the interwoven spiritual pressure, emitting a faint cracking sound. The Shinigami members along the way saw him and drew their swords to rush at him, but they couldn't even touch the hem of his clothes. They were deceived by the illusion of a mirage and began to kill each other.

Soon, he arrived at the First Division.

In front of the First Division, a towering figure stood there, like an unchanging mountain.

Yamamoto Genryusai Shigekuni, leaning on his Zanpakuto Ryujin Jakka, possessed a power within his aged body capable of incinerating the heavens and earth. His gaze fell upon Aizen, his cloudy eyes filled with an unyielding coldness and killing intent. "Aizen Sousuke!" his voice was low and hoarse, "You arrogant and rebellious scoundrel, I underestimated you. How dare you appear before me alone, so openly and honestly?!"

"Yamamoto Genryusai Shigekuni."

Aizen softly uttered the Captain-Commander's name, sighing, "The strongest Shinigami in the history of Soul Society, the pinnacle of Shinigami existence. Originally, I never planned to confront you directly, but..."

He unzipped his clothes, revealing his bare chest. The Hogyoku, replenished by the Soul King's heart and perfectly fused with him through the Great King's assistance, was pulsating within his chest!
“From the moment Guan Yi killed Yhwach, I knew that I had very little time left to evolve. I could no longer wait for Kurosaki Ichigo to grow, and at this moment, the only opponent who can help me evolve is you.”

He held the Mirror Flower Water Moon at an angle, and instead of deepening his control over the five senses, he actually released the power that was controlling the Captain-Commander's five senses.

"Come, either burn me to ashes or help me... ascend the one and only throne."

……

Rumbling--

A terrifying explosion, like the shattering of a star's core, echoed through the Spirit King's Palace. A soldier, charred black, emerged from the explosion, panting heavily, and knelt on one knee, supporting himself with a writing brush.

Is it over?

He raised his head, but his eyes were blind. He could only use his already weak spiritual power to sense Guan Yi. He noticed that Guan Yi was approaching him step by step, but he was unable and powerless to make any further counterattacks.

"Human, let's make a deal."

He took a deep breath and said, "You wouldn't want the world to return to the desolate state it was millions of years ago, where there was neither life nor death, neither progress nor regression, would you? I am loyal only to the Spirit King, and to me, it makes no difference who the Spirit King is."

You can absorb Adnes's power, but I hope... you can send a portion of that power into Yhwach's corpse, so that he can serve as a wedge to maintain the existence of the three realms.

And you will become the Spirit King, a Spirit King who can act freely and do whatever you want. The Zero Division will become your subordinates; of course, if you don't need us, you can simply kill us all.

"surrender?"

Guan Yi looked at him and laughed, "I would have agreed if you had said that from the beginning, but you can't wait until you realize you can't win before surrendering. You should have thought of the worst possible outcome when you captured my companions."

puff--

As soon as he finished speaking, Guan Yi gave Hyosube Ichibei the same death as the other four members of the Zero Division, slitting their throats with a single blow!

As Hyosube Ichibei slowly collapsed to the ground, he sighed helplessly, "Adnes, I'm sorry, it really ends here."

Zero Division, completely wiped out!

Guan Yi looked at his wrist; the guiding runes given by the secret realm were already dazzlingly red!

Devouring the Spirit King? Destroying the Three Realms?
Guan Yi would never do that; he was just trying to scare the Zero Squad. His goal was simple: conquer the secret realm and obtain another golden rune!
Now, this goal can be said to have been achieved. Even without fully conquering the secret realm, his current 'achievements' are enough to support him in obtaining the golden secret rune. Of course, imperfections can also be frustrating.

Having come this far, with his power reaching the level of a near-Spirit King, how could he possibly not complete the final conquest of the secret realm?

If nothing unexpected happens, I'll be taking down my last boss—Aizen!
　What the heck? I caught a cold, and the heating at home is broken. In this sub-zero weather, my fingers are freezing and aching just typing.

　　
　
(End of this chapter)