One Piece: Start with Zanpakutō

"Aaah!"

Brynndi World, who was nailed into the wall, widened his eyes so much that the blood vessels looked like they were about to burst. Suddenly, he opened his mouth and spewed out a mist of blood. Only then did a belated, earth-shaking scream finally erupt from his throat.

The pain of having his abdomen split open by that devastating slash was unbearable even for him.

The dizziness from the overwhelming impact of Conqueror's Infused's kick nearly caused him to lose consciousness on the spot.

When both the pain and the dizziness burst forth together, the World Destroyer was instantly pushed to the brink of collapse.

"Is it over already?"

Seeing this scene, Shiryu's expression was filled with astonishment.

He never expected that the clash between Rosen and Brynndi World would not only conclude so quickly, but also that the entire tempo of the battle would be completely dictated by Rosen.

This was the World Destroyer!

If not for the scheme orchestrated by the World Government back then, how could such a monster have been frozen and locked away for 26 years?

What shocked Shiryu even more was Rosen's next move.

If it were any other navy officer, they would have stopped after severely injuring Brynndi World with that last attack — but Rosen was different.

After using Conqueror's Infused kick to send Brynndi World crashing into the wall, Rosen's hand gripping the hilt of Senbonzakura tightened slightly. Then he raised the hilt high and slashed it downward with force.

Whoosh whoosh whoosh —

Amidst the sharp sounds of air being torn apart, all the cherry blossom blades that had been suspended around Rosen shot forward like a thousand arrows, raining down upon Brynndi World embedded in the wall.

This posture was not that of someone practicing against an opponent — it was to cut the weeds and eliminate the roots completely.

"Is this really… the Navy?"

Seeing this scene, Shiryu couldn't help but turn his head to look at Zephyr.

But what shocked him even more was that Zephyr, who once called himself the "Admiral who does not kill," didn't reprimand his student for ruthlessly slaughtering a prisoner.

Instead, he simply crossed his arms over his chest and watched quietly, letting Rosen act as he pleased.

"Mr. Zephyr, this is no good!"

"The World Government has strict regulations. As long as prisoners on the sixth floor can still be detained, they are not to be executed!"

"Especially those with Devil Fruit abilities!"

Domino, who had fainted from the shock of the earlier Conqueror's Haki clash between Rosen and Douglas Bullet, had finally woken up.

When she saw Rosen not stopping even after seriously injuring Brynndi World but instead preparing to finish him off, she immediately shouted anxiously.

She, of course, had no sympathy for these prisoners — especially the monsters on the sixth floor.

But as the chief warden, she had a duty to uphold.

Especially since the World Government had explicitly stipulated, without permission from higher authorities, or if the prisoners had not attempted escape, no one — not even the warden, vice warden, or director — was allowed to execute any sixth-floor prisoners on their own. Violators would face heavy punishment from the World Government.

There were two reasons for this.

First, to prevent the fruits from reincarnating after death, potentially being obtained by pirates elsewhere and stirring up new chaos.

Second, because each sixth-floor prisoner, regardless of whether they possessed Devil Fruit abilities, had immense value. They were all considered precious specimens by the World Government, useful for countless secret and horrifying human experiments.

Over the years, no one knew how many prisoners had been secretly drained of blood or transferred out to vanish in unknown labs — ultimately perishing as nameless corpses in some dark experiment.

But Domino knew nothing of this truth.

She tried to stop Zephyr purely out of concern, not wanting to see Rosen — who clearly had limitless potential — ruin his future and become a "butcher" marked by the World Government.

Yet Zephyr didn't say a word. He simply handed her a small booklet and opened it for her to see.

"Exemption Order."

Domino glanced at it and immediately recognized it — this was an exemption order personally signed by Fleet Admiral Sengoku.

She understood instantly.

With this exemption order, as long as Rosen didn't destroy World Government member nations or cross the fundamental lines like studying Poneglyphs, then no matter what he did — even slaughtering the entire sixth floor — he would not be punished.

"For the time being."

"All you need to do is cooperate and watch quietly."

"Until my student finishes this internship."

Seeing Domino lower her head and stop speaking, Zephyr calmly took the exemption order back and said those words softly.

Domino felt her entire body turn cold when she heard it.

She understood perfectly what Zephyr meant.

Until Rosen's training ended, countless scenes like today — slaughtering prisoners, bloody duels — would continue to unfold in Infinite Hell.

"Using the blood of Infinite Hell's pirates… to forge a Navy King?"

Shiryu looked deeply at Zephyr, finally seeing the Navy's true plan.

At this moment, he finally understood the true purpose of the Navy Headquarters' highest division in coming to Infinite Hell.

They were forging a supreme "King of the Navy" for Marine Headquarters.

To achieve this, they did not hesitate to turn the sixth floor of Impel Down into a hell of blood and corpses.

Moreover,

This wasn't just Zephyr's personal idea — it was a consensus reached by the top brass of Marine Headquarters.

Otherwise, Sengoku would never have approved such an exemption order for Rosen.

With the appearance of that exemption order, both Shiryu and Domino fell silent, saying nothing more.

They simply watched Rosen quietly, watching those beautiful yet terrifying cherry blossoms — each imbued with black Armament Haki — rain down upon the World Destroyer.

"I haven't killed all those traitors yet…"

"I haven't taken revenge on the World Government yet…"

"How could I possibly fall here?!"

Brynndi World, still trapped in the wall, glared at the oncoming cherry blossom blades, his teeth grinding so hard they nearly shattered. The sound that squeezed out from his throat was filled with endless hatred and unwillingness.

"I am the World Destroyer!"

"All who stand in my way shall be destroyed!!"

Suddenly.

Brynndi World let out a heaven-shaking roar, his eyes burning with hatred for the World Government and the traitors. In that moment of ultimate rage and vengeance, he took a deep breath and activated the More-More Fruit once more — but this time, not to accelerate, but to enlarge.

Crack.

His arms, legs, torso, head — his entire body rapidly expanded.

In the blink of an eye.

Brynndi World tore himself free from the wall by forcibly enlarging his body, transforming into a giant towering figure.

This is… the final trump card.

Brynndi World roared out. He was clearly just running, but each step in Infinite Hell triggered deafening sonic booms. His massive figure, like a teleporting giant, created a violent hurricane as he dodged the oncoming cherry blossom blades.

In an instant, he soared through the air above Rosen's head.

His massive right foot, covered in hardened Armament Haki, lifted high like a giant black axe capable of splitting mountains and cleaving the sea, and then slammed down toward Rosen's skull with unstoppable force.

"Multiplier. Hundredfold damage!!"

Rosen stood there, quietly raising his head to gaze at the enormous, pitch-black foot descending like a divine axe.

Then, he slowly lifted his hand, palm facing up, directly aimed at Brynndi World's massive heel.

"Conqueror's Infused — Blut Vene Anhaben."

...

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