Impel Down, the Great Prison.
It forms a triangle with Marineford, the Marine Headquarters, and Enies Lobby, firmly guarding the choke point of the first half of the Grand Line.
If any one of them has a problem, the other two can quickly provide support.
This also means that Cheng Xiaoyu doesn't have much time left.
He took a deep breath, and the power of the Shadow Fruit surged within him.
He knew very well that he had to act quickly.
The fourth level, Blazing Hell.
The air was filled with a pungent smell of sulfur, and hot magma flowed on the ground.
The prisoners here generally had bounties of around 70 million Berries, and their strength was not to be underestimated.
But for Cheng Xiaoyu, they were just walking experience packs.
"Come out, Shadow Legion!"
Without hesitation, Cheng Xiaoyu directly summoned all his shadow soldiers, forming a vast Shadow Army.
The dark shadows surged out like a tide, quickly solidifying into soldiers wielding sharp blades, exuding a cold killing intent.
No techniques, just a straightforward push!
"Kill."
The cold command was like a pronouncement of death.
The shadow soldiers, like a black tide, swept across the entire Blazing Hell.
They had no fear, no pain, only absolute obedience and the instinct to kill.
"Moo!"
A giant Minotaur beast let out an angry roar; its body swelled, and its muscles bulged, as if forged from steel.
This was the awakened power of the Ox-Ox Devil Fruit, a brave ox unafraid of difficulties.
However, in front of the Shadow Army, all its resistance seemed pale and powerless.
"Moo~"
With a pained cry, the Minotaur beast crashed to the ground, its massive body quickly devoured by the shadow soldiers.
Not far away, a curvaceous woman in revealing clothes was brandishing a long whip, trying to fend off the shadow soldiers' attack.
She was the beautiful pirate Miss Olive, known for her ruthless methods and enchanting appearance.
Hannibal almost got tricked into helping her escape.
"Handsome, wanna play with big sis? I can make you very happy, you know~" She giggled, trying to charm Cheng Xiaoyu with her allure.
However, Cheng Xiaoyu was unmoved by her temptation.
"Hey, hey, hey, how old are you? Don't you have a mirror?"
"Damn it!" Miss Olive's expression changed; she knew she had hit a wall.
The next second, she was engulfed by the shadow soldiers, not even managing to let out a scream.
Blazing Hell was completely transformed into a paradise of shadows.
As the last prisoner fell, the system's notification sound rang out:
"Congratulations, Host, your level has increased to 67!"
"Number of extractable shadows: 308 / 10000."
Cheng Xiaoyu didn't hesitate for a moment and immediately headed to the next level.
He had to hurry!
The fifth level, Freezing Hell.
The temperature here plummeted, and the air was filled with an icy chill.
The ground was covered with thick ice, and the cold wind howled, cutting like a knife on the face.
Compared to the previous Blazing Hell, it was like going from fire to ice!
Those imprisoned here were all formidable individuals with bounties exceeding 100 million Berries, each possessing strength that could give the Marine a headache.
"A bit interesting." Cheng Xiaoyu's lips curled into a cold smile, "Perfect for some practice."
The stronger the opponent, the more it ignited his desire to fight.
Cheng Xiaoyu repeated his tactic, summoning the Shadow Army again and launching a ruthless slaughter in Freezing Hell.
However, this battle was not as easy as before.
These pirates with bounties over 100 million Berries were all battle-hardened strongmen; they possessed various Devil Fruit abilities and extremely rich combat experience.
Fortunately, he also had powerful generals like Guina, Gin, and Arlong on his side, and their strength was also rapidly increasing during the battle!
The intensity of the battle increased significantly compared to the previous level, and the shadow soldiers also began to suffer casualties.
For a time, Freezing Hell became a meat grinder; screams, roars, and the clang of weapons intertwined, forming a cruel symphony.
Half an hour later, the battle finally ended.
Cheng Xiaoyu stood amidst a mountain of corpses and a sea of blood, covered in fresh blood, but he felt no fatigue; instead, he was filled with excitement.
"Congratulations, Host, your level has increased to 81!"
"Number of extractable shadows: 358 / 10000."
The system's notification sound rang out again, and Cheng Xiaoyu's lips curled into a cold smile.
Cheng Xiaoyu stood on a desolate ice field, taking a deep breath and feeling the surging power within him.
He knew he was getting closer to his goal.
"Next target, the sixth level, Infinite Hell!"
Of course, he knew there was also a 5.5 level here, which was the secret underground hidden floor.
There were the Revolutionary Army's Emporio Ivankov and his adorable subordinates.
However, their overall strength and bounties were not high, and the entrance to the hidden floor was difficult to find, so Cheng Xiaoyu ultimately gave up on it.
He continued downwards; the entrance to the sixth level, Infinite Hell, was right before his eyes.
Those imprisoned here were on a completely different level from the previous floors.
They were strong, had high bounties, were ruthless killers, or possessed crucial intelligence; they had to meet at least one of these criteria.
In short, in the eyes of the World Government, these heinous criminals included some famous great pirates.
They were individually confined in dark cells, enduring endless solitude and torment.
Pirate King Roger was imprisoned on this level after he surrendered.
Of course, for Roger, if he wanted to escape, it didn't matter where he was imprisoned.
Also, Ace, Crocodile, and Doflamingo, who were captured later, were also imprisoned on this level.
And the crew members Blackbeard took out from this level during his invasion—
Former Impel Down Head Jailer Shiryu of the Rain!
Giant Sanjuan Wolf!
Drunkard Vasco Shot!
Female pirate Catarina Devon!
These were all great pirates with bounties exceeding 500 million Berries! If Cheng Xiaoyu eliminated all of them, he might break through to level 90!
But then again, it was unlikely that Cheng Xiaoyu could kill everyone on this level within the limited time.
Not to mention how tricky these people's strengths were, time simply wouldn't allow it.
He estimated that the Admiral should be arriving soon, and if he didn't leave in time, the situation would become very troublesome.
If he were captured again, he probably wouldn't receive such lenient treatment.
Now that Cheng Xiaoyu's level had reached 81, not only had his own strength greatly increased, but he could also extract Admiral-level shadows.
This undoubtedly gave him a lot of operational space, so Cheng Xiaoyu's goal in this Infinite Hell was very clear.
As for those imprisoned here with Admiral-level combat power, besides the diarrheic Magellan,
The figure that most quickly appeared in his mind was that man.
A former member of the Roger Pirates, known as the Devil Offspring.
A man whose combat power rivaled that of Pluton Rayleigh, his true strength should be at the Admiral level!
His name was—
Douglas Bullet.