The great undersea prison, Impel Down.
This was the world's number one prison, known as the "iron wall," located in the Calm Belt of the first half of the Grand Line.
Because after an ability user dies, their Devil Fruit ability will randomly appear somewhere in the world.
To prevent the abilities of powerful ability users from appearing somewhere in the great sea after their death and being eaten by evil people, continuing to wreak havoc.
So, except for some radical Marines who couldn't tolerate any crime, other Marines, when they arrested an ability user, unless they were forced to, would leave them alive and imprison them in the great undersea prison.
For heinous criminals with bounties over 100 million, if they were imprisoned in the great undersea prison, non-ability users would have their death penalty carried out depending on the situation, while ability users would only have the fate of dying of old age.
This world's number one prison, which had been established for hundreds of years and formed an "iron triangle" relationship with Marine Headquarters and Enies Lobby.
To this day, there had only been one successful prison break.
The one who had successfully escaped was one of the three legends of the Pirate King's era, the "Golden Lion" Shiki, a great pirate who had sacrificed his two legs to fly in the great sea.
Except for that legend, no matter how heinous, no matter how powerful a pirate was before being arrested, they could not escape from this hellish prison.
Similarly, no one could invade this great undersea prison, which was located in the Calm Belt and where, with the slightest disturbance, its good brother, Marine Headquarters, could use the special sea current of the Gates of Justice to arrive in under half an hour to provide support.
Even a Four Emperor's pirate crew could not invade this world's number one prison.
Today, however, there was a legal pirate who, on his way from Mary Geoise to Marineford, had secretly left the team, stolen a warship, and was leading his crew to invade this world's number one prison at its weakest moment in hundreds of years.
But Blackbeard was fast, and Karl was even faster.
Rule-based abilities were all unreasonable existences.
On this point, no one had more of a right to speak than Karl, who had Carina, Perona, Hancock, Baccarat, and other women by his side.
As one of the rule-based abilities, the Paramecia Door-Door Fruit was naturally also one of the unreasonable abilities.
Others, to invade Impel Down, even Blackbeard, needed to break in through the main gate, then take the elevator or go through the stairs of each floor to reach the Infinite Hell.
And Karl's group of five?
They just moved quickly in the different dimension, and quickly passed through the layers of hell of Impel Down, arriving at the sixth level, the Infinite Hell.
Creak—Boom!
The sound of an air door opening was particularly ear-piercing in the silent and dark Infinite Hell, which had lost all hope and light.
When gazes were cast at the air door that had opened in the void.
An earth-shaking, unparalleled, domineering aura immediately surged out from the open door.
The aura formed a hemispherical force field that, in the blink of an eye, covered the entire Infinite Hell.
A fierce wind appeared out of thin air, blowing the hair of some listless, dazed prisoners, making their faces show horror, and their whole bodies become alert.
In this force field, some people were blown back, and some were knocked to the ground, but no one fainted.
Even those weaklings whose will had been completely broken by the torture of the Infinite Hell for so many years, and were no longer as strong as they once were, were the same.
The only ones who fainted were the surveillance Den Den Mushi installed in every corner.
They all closed their eyes and fell off the walls.
This powerful and terrifying, yet precise control of Conqueror's Haki, which only covered the Infinite Hell and only knocked out the Den Den Mushi.
Many powerhouses who had been imprisoned in the Infinite Hell for years and had probably been forgotten by the great sea now, couldn't help but feel a wave of amazement.
So strong, such perfect pressure!
The person had not yet appeared, but this kingly force field that deliberately avoided everyone.
It told everyone that behind the door was a monster with the disposition of a king and extremely powerful strength.
When the air door was completely opened, and a young man wearing knight's armor and a blue cloak on his back walked out from inside.
Those major criminals, whose eyes and Observation Haki were all fixed on the air door, were first slightly stunned.
Immediately after, all sorts of expressions appeared on their faces.
"A knight? A brat?!"
"Kni... Knight King!"
"Em... Emperor... The fifth Emperor of the Sea! Why is he here?!"
"Knight King? The fifth Emperor of the Sea?!"
"Hey, hey... what are you talking about? Do you know this brat?!"
"Ah... I just came in. He just entered the Grand Line three years ago, and in just one year, he reached the top and became the fifth Emperor of the Sea, as famous as Whitebeard! Not long ago, he just established the Golden Nation and was crowned with the title 'Knight King,' Dragon Knight Karl."
"Reached the top in one year? Are you kidding me?"
"If he's that amazing, then what's his bounty?"
"When I came in, his bounty was 3,511,000,000 Berries!"
"Hiss... that bounty is second only to Kaido's."
"Hey... Knight King, get me out of here! I'm willing to be your subordinate!"
"Save me, Knight King! I'm willing to follow you and help you become the Pirate King!"
"Knight King..."
When the surprised and astonished voices sounded.
Those major criminals who had been imprisoned before Sea Circle Calendar 1517 and couldn't even be bothered to pay attention to recent years, after learning from the newcomers that Karl was one of the highest peaks in the world.
The atmosphere in the entire prison immediately boiled over.
Pairs of eyes, shining with red light in the darkness, were cast at Karl, full of fanaticism and madness.
Those hysterical shouts were the desire for survival that had accumulated for years, decades.
Being stared at by so many major criminals, Baccarat, who was originally going to come out of the different dimension, immediately retracted her long leg that she had stretched out.
Nami, on the other hand, ignored these people and flew directly in front of the elevator of the Infinite Hell. She stretched out her hand and touched the ground, controlling the ground of the Infinite Hell to rise and block the entrance of the elevator, as well as the entrance back to the fifth level, to prevent Magellan from disturbing Karl so quickly.
Facing the gazes of these death-row inmates and life-imprisoned major criminals.
Karl, as if he hadn't heard their voices, didn't even glance at them. He took Marguerite and Aphelandra and walked towards a cell.
Each step was as heavy as a moving mountain.
Those hysterical major criminals were all pressed by an invisible pressure, their chests feeling tight, and they found it difficult to breathe.
The shouts that had resounded throughout the entire Infinite Hell gradually died down.
Looking at the slowly walking figure, many major criminals who had seen the pinnacle of the world seemed to see the reflection of those four monsters in that young man.
The older major criminals saw the reflection of those three legends in Karl.
Just as the newcomer had said.
A... monster who had reached the top
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