Whitebeard directly shattered the gates of Onigashima Castle with a single powerful strike.
"What!"
Jack, who had been somewhat dazed, instantly snapped awake. He grabbed his two sickle-shaped swords and hurried downstairs.
"Where are Kaido-sama and my two older brothers?" Jack asked the sentry walking behind him.
"Kaido-sama, King-sama, and Queen-sama have gone to the city to attend the Wano Country Festival today!" The sentry replied honestly, already rushing to keep up.
By this time, Jack reached the main hall of the castle.
Whitebeard, accompanied by four division commanders and Pryce, had already entered.
"That Kaido, his taste is as bad as ever." Whitebeard said coldly.
"Living in a place like this, it's more like a lair."
Marco body was already engulfed in blue flames, his eyes scanning alertly.
Diamond Jozu stood tense, half of his body transformed into diamond.
Vista had drawn his twin swords, ready for battle.
Rakuyo meteor hammer was poised at the ready.
Meanwhile, Whitebeard and the other four division commanders subtly surrounded Pryce in the center.
Finally, Jack arrived.
"Whitebeard, how did you get here?"
Although Jack had heard reports of Whitebeard arrival, seeing it in person still left him utterly stunned.
Any foreign ship entering Wano had to undergo strict inspections, and Onigashima, as Kaido residence, was heavily guarded by countless sentries—both overt and covert.
Yet, these formidable guards had somehow let Whitebeard and his crew slip through as if they were ghosts?
"Isn't this the reckless Jack?" Whitebeard , without bothering to explain his arrival, mocked Jack foolishness.
"Young brat, fighting you would be boring."
"Call Kaido out. It's been a long time since I last beat him up." He laughed heartily.
"Old man, with one foot in the grave, do you think you're worthy of seeing Kaido-sama?" Jack spat on the ground and charged straight at Whitebeard Newgate and his crew.
"This guy lives up to his reputation as the most reckless man in the one piece world." Pryce quietly observed Jack, fearless and charging alone toward the strongest of the Four Emperors.
"Does he really think he can force our captain into action?" Diamond Jozu sneered, stepping forward. His entire body transformed into diamond.
Jack twin swords slashed viciously at Jozu neck—if Jozu hadn't already turned into diamond, that strike would have been lethal.
Clang!
Sparks flew.
"Is that all you've got? Are the Disasters just here to scratch an itch?" Jozu rubbed the faint white mark his attack left and grinned, fueling Jack rage.
They immediately clashed in a fierce battle.
"Pryce, pay attention." Whitebeard pointed at Jack, who was engaged with Jozu, and explained to Pryce.
"Jack is reckless, but his fighting style is ruthlessly targeted—every move aims for vital points."
"Second, keep an eye on Jozu."
"He use his Devil Fruit and body advantages fully during combat." Whitebeard continued.
The clash between Jozu and Jack produced constant metallic ringing, Jack increased strength after transforming into mammoth form made his size and power formidable.
Jack charged at Jozu, who stood his ground, tusks gleaming with sharp black Armament Haki.
Jack tusks, coated in Haki, tore into Jozu diamond body, leaving a long crack. Despite Jozu quickly repairing it, the fight shifted dramatically.
Jozu frowned, surprised by Jack increased strength and speed—his opponent was far more formidable than he appeared.
"I underestimated him." Jozu silently thought.
"I need to get serious."
Meanwhile, Marco looked worried.
"Should I help Jozu?" he asked.
"No need," Whitebeard said calmly.
"Jozu just underestimated him, when he gets serious, jack wont have an easy time."
Pryce watched intently. Jozu stood up again, but faint black lines ran through his shimmering diamond body.
"What's happening?" Pryce asked curiously.
Diamond Jozu had never looked like this before—his body covered with faint black lines, a sign of intense use of Armament Haki.
"This is what happens when Jozu covers his entire body with Haki," Whitebeard explained with a nod.
Looking at Diamond Jozu, who was covered in black lines, Pryce felt a sense of unfamiliarity.
"This guy is finally going all out!" Marco smiled faintly, no longer considering stepping in to help Diamond Jozu.
"Jozu, your strength has declined too much!"
"If you don't call for help, next time I might just pierce straight through you!"
"Hahaha!"
Jack, having just landed a successful strike, spoke with utter arrogance toward Diamond Jozu.
"Enough talk. Let's continue!"
A serious Diamond Jozu beckoned to Jack.
"Prepare to die!" Jack roared, his massive body charging once again toward Diamond Jozu.
Seeing Jack imposing figure, Diamond Jozu eyes narrowed as he steadied his stance.
The two clashed again! But this time, Jack' sharp tusks covered in Armament Haki failed to pierce Diamond Jozu body as intended.
Jozu diamond-hard hands firmly gripped Jack tusks. They immediately engaged in a contest of strength!
At first, their strength appeared evenly matched. But as Diamond Jozu adapted to Jack power, he seized Jack tusks and twisted them forcefully to the side.
Jack expression changed; his massive body momentarily lost balance and crashed to the ground.
Diamond Jozu didn't wait for Jack to get up. He swiftly moved to Jack side.
His enormous diamond fists pounded relentlessly into Jack abdomen — twice!
In just a few breaths, Diamond Jozu had delivered dozens of punches, each one hitting with precision. Excruciating pain instantly radiated through Jack body.
Finally, Jack scrambled to his feet.
His massive trunk swung downward ferociously at Diamond Jozu.
Despite his size, Diamond Jozu was incredibly swift. With a quick dodge, he avoided Jack trunk, which slammed into the ground with a deafening crash.
The castle floor shattered!
"You've forced my hand!"
Seething with rage after being thoroughly beaten, Jack body radiated a brilliant golden light. He transformed into his strongest form — the Hybrid Mammoth Man! His massive frame now covered in impenetrable elephant hide, his muscles further engorged.
He drew his twin blades.
Seeing Jack getting more serious, Jozu eyebrows creased slightly.
"Mammoth Twin Blades!"
Jack charged, swinging his twin blades. The blades, sickle-like, formed a deadly web of slashes, glinting fiercely.
Every nearby stone along the path was sliced into powder with clean cuts.
Pryce watched this astonishing display with wide eyes.
Meanwhile, Diamond Jozu was cautious.
His already dazzling diamond arms gathered a radiant stream of light.
Countless diamond energies converged into his arms.
"Brilliant Punk!" Diamond Jozu roared.
His shining diamond arms darted toward Jack at incredible speed.
"He's actually forcing Jozu to use this move!" Pryce thought in shock.
In canon timeline, Diamond Jozu had used this very move to injure Marine Admiral Aokiji!
Soon, Jozu and Jack collided head-on. Jozu diamond arm plunged straight into the web of blades Jack unleashed — the once indestructible web now met resistance.
Sparks flew as the blades struck Jozu diamond arm at nearly imperceptible speed.
"Clang! Clang! Clang!"
Jozu felt resistance but, with both exerting immense strength, his diamond arm struck Jack chest fiercely.
Meanwhile, Jack, with relentless determination, thrust his dual blades straight into Jozu diamond arm.
In the next moment, Jack spat out a mouthful of blood, his massive body sent flying backward.
Jozu, with his arm pierced by the blades, let out a pained grunt.
Jack was propelled backward at high speed and crashed into a thick wall, which shattered into pieces on impact. Jozu strike had significantly weakened Jack arm—his powerful punch, carrying unparalleled force, had landed squarely on Jack chest.
At this point, Jack felt as if his internal organs had been displaced.
Of course, when Jozu sent Jack flying, the blades embedded in Jozu arm caused damage to Jozu as well.
The tendons and blood vessels in Jozu right arm were severely torn. Enduring intense pain, he yanked the blades out.
Blood gushed from the wound as the blades widened it. Jozu right arm was now barely able to lift.
He quickly took out a Senzu Bean with his left hand and ate it.
A green glow radiated from Jozu body.
The bleeding from his right arm stopped almost instantly, and the wound began healing visibly.
Seeing this, Jack remembered he had received a bag of Senzu Beans from Kaido when they were brought back.
He quickly took one and swallowed it.
A green light—less radiant than Jozu—also emerged from Jack body. He immediately felt some internal relief.
However, Jack sensed that his injuries were only about half healed. Despite that, his strong willed nature pushed him to his feet, leaning against the wall.
By now, Jozu had fully recovered. It's worth noting that Jack had consumed a modified Senzu Bean, which reduced its efficiency, while Jozu had taken an unaltered one that allowed its full potency.
Naturally, their recovery levels differed.