The silence that followed the exchange lasted only a heartbeat.
Arthur and Shanks stood several meters apart, their swords still raised, while the remnants of their Conqueror's Haki drifted through the ruined battlefield like invisible currents. The ground beneath them had been carved apart by countless exchanges, and the surrounding forest bore the scars of every missed strike. Yet neither man seemed concerned with the destruction around them. Their attention remained fixed entirely on each other.
Arthur slowly exhaled.
His mind was still processing what had just happened.
He had finally understood the principle behind Observation Kill.
It wasn't simply about suppressing an opponent's ability to sense the future. It was about using his own will to interfere with the very process by which that future was perceived. Observation Haki normally connected the senses to possibilities that had not yet occurred, allowing the user to distinguish movement before it happened.
Arthur had learned to attack that connection itself.
Shanks had realized it too.
The red-haired Emperor's eyes narrowed as he studied Arthur from across the battlefield. His usual relaxed expression had disappeared completely.
"You figured it out," Shanks said.
Arthur rotated one of his swords before settling it back into position. "I figured out enough."
"Observation Killing, enough to interfere with my Future Sight."
Arthur's eyes sharpened. "So that's what you call it."
Shanks gave a faint smile. "You already knew."
"I suspected."
Neither man elaborated.
They didn't need to.
Shanks had already demonstrated that he could see several moments ahead. Arthur had experienced it directly. Every movement he made had been answered before it was completed, as though Shanks were reading a page Arthur had not yet turned.
Now that advantage had been disrupted.
But Shanks still had something Arthur had not yet completely solved.
Armament Haki.
Arthur had already felt it through every collision.
Shanks' swordsmanship was powerful enough on its own, but when Busoshoku Haki reinforced his movements, every strike carried an additional layer of destructive force. More importantly, his control was so refined that the Haki seemed to become part of the blade rather than something placed upon it.
Arthur understood that difference now.
Armament wasn't merely armor. It was the ability to impose one's will upon one's own strength and make it obey.
He tightened his grip around both swords.
Then I'll have to surpass that too.
Shanks moved first.
Gryphon swept across the battlefield.
Arthur intercepted it.
CLANG!
The collision produced no massive explosion this time. Instead, the two blades remained pressed against one another as both men poured Armament Haki into the contact point.
Black sparks flickered between the steel.
Arthur felt Shanks' force pushing against his blades.
He adjusted his stance.
Then something changed.
The pressure didn't come from the sword.
It came from Shanks himself.
Arthur's arms suddenly felt heavier.
Not because the blade had become stronger, but because Shanks' Haki seemed to press directly against his body, forcing his muscles to respond to the Emperor's will.
Arthur's eyes narrowed.
So this is his Armament.
Shanks pushed forward.
Arthur's feet slid backward.
One meter.
Then another.
The ground cracked beneath his boots.
Shanks continued pressing.
"You've learned how to interfere with my Observation," he said calmly. "But can you break through my Armament?"
Arthur smiled. "Let's find out."
He released one sword from the lock.
Shanks immediately adjusted.
Arthur's second blade swept toward his side.
Shanks blocked it.
The first blade followed.
Gryphon intercepted.
Arthur's twin swords moved in opposite directions, one forcing Shanks to defend while the other searched for an opening. Yet Shanks didn't retreat. His Armament remained concentrated around Gryphon, allowing him to withstand both blades without losing his balance.
The exchange became a contest of pressure rather than speed.
Arthur struck.
Shanks blocked.
Arthur redirected.
Shanks absorbed.
Every collision sent vibrations through Arthur's arms.
Neither man gave ground.
From the edge of the battlefield, Sugar watched carefully.
"They're slowing down."
Kuina shook her head. "No. They're concentrating."
Robin's gaze remained fixed on the two Emperors.
"They're testing Armament."
Sabo frowned. "Against each other?"
"More precisely, against each other's will."
The explanation made Law's expression tighten.
He understood what Robin meant.
The swords were only the visible part of the battle; beneath every collision, their Haki was fighting for control.
Arthur suddenly changed his approach.
Instead of trying to overpower Shanks' Armament, he stopped resisting it.
For an instant, Shanks' pressure moved through his swords and into his body.
Arthur allowed it.
Then he redirected his own Haki through the contact point.
BOOM!
Shanks' eyes widened.
The two men separated.
Arthur landed several meters away.
Shanks looked down at Gryphon.
A thin layer of black lightning crawled along the blade.
"You've changed your flow."
Arthur smiled faintly. "I was forcing my Armament against yours."
"And now?"
"I'm letting it pass."
Shanks' expression became serious.
Arthur raised both swords. "Then I'm taking control of the part that reaches me."
Shanks understood immediately.
The next exchange was different.
Arthur attacked from both sides, forcing Shanks to absorb and redirect each strike without surrendering his position.
Arthur didn't retreat.
Instead, he pushed his Haki through the blades.
The sensation was strange.
It wasn't simply pressure.
It felt like Arthur's will had entered the space around Shanks and was beginning to wrap itself around the Emperor's Armament.
Shanks' expression tightened.
His arm suddenly felt heavier.
His shoulder dropped by a fraction.
His movement slowed.
Only slightly.
But Arthur noticed.
So did Shanks.
Arthur's eyes sharpened.
There.
He understood the sensation.
His Conqueror's Haki wasn't merely coating his Armament.
It was imposing itself upon it.
Arthur stepped forward.
Shanks attempted to move.
His body resisted.
Not because he had lost strength.
Not because Arthur had physically restrained him.
Something deeper was happening.
Arthur's Armament was forcing Shanks' own Haki to acknowledge a stronger authority at the point of contact.
Shanks gritted his teeth.
Arthur's pressure increased.
For the first time during the duel, Shanks' sword arm was forced downward.
The red-haired Emperor looked directly into Arthur's eyes. "That's new."
"I just found it." Arthur's smile widened.
Shanks suddenly released a tremendous burst of Haki.
BOOM!
Arthur was thrown backward.
He landed on one knee, sliding several meters across the earth before stopping.
Shanks remained standing.
But his breathing had changed.
Only slightly.
Arthur noticed. "So it works."
Shanks gave a short laugh. "You're using Conqueror's Haki to dominate Armament."
"I call it Armament Lock." Arthur rose slowly.
The name seemed to linger between them.
Shanks looked at his sword, then at Arthur.
"Armament Lock..." He smiled.
"Not a bad name, right?" Arthur tightened his grip.
"The stronger the Armament, the harder it should be to break."
"Exactly."
"Which means you'll need overwhelming control." Shanks raised Gryphon.
Arthur's eyes narrowed. "I know."
Shanks disappeared.
Arthur reacted immediately.
Their swords collided.
CLANG!
This time, Arthur didn't simply defend.
He imposed his will.
Black lightning erupted from both blades.
Shanks' movement abruptly stopped.
For a fraction of a second, his body seemed to hesitate.
Arthur stepped forward.
One blade pressed against Gryphon.
The second remained aimed at Shanks' opening.
The sensation intensified.
Shanks' Armament seemed to sink beneath Arthur's pressure.
His muscles remained capable of moving.
His mind remained clear.
Yet his body resisted the command to attack.
It was as though some instinctive part of him had accepted Arthur's authority and no longer wished to oppose it.
Shanks' eyes widened.
He isn't stopping my body.
He understood.
He's making my own Armament Haki submit.
Arthur pushed harder.
The ground beneath both men cracked.
Shanks' knees bent slightly.
It's not impossible to break the Armament Lock. It's only affecting my Haki...
Shanks looked at his trembling hand. He had deliberately released part of his Haki for an instant, creating just enough separation to break Arthur's control.
For the first time, the Emperor looked as though he was being forced to accept the incoming attack rather than evade it.
Arthur's expression became focused.
This is Armament Lock.
It wasn't physical restraint or paralysis. It was domination—a king's will imposed upon another king's armor.
A king's will imposed upon the armor of another king.
The stronger the connection between an opponent's Armament and their body, the more dangerous the technique became. Instead of breaking through the defense, Arthur forced the defense itself to acknowledge him.
Shanks suddenly laughed.
Arthur's eyes narrowed. "What's funny?"
"This." Shanks' Conqueror's Haki exploded outward.
The pressure shattered Arthur's Lock for an instant.
Gryphon swung.
Arthur crossed both swords.
BOOM!
The impact launched him backward.
He flipped through the air before landing on both feet.
Shanks stood in the center of the battlefield, his coat torn and his breathing heavier than before.
"You really are dangerous."
Arthur straightened. "You broke it."
"Of course." Shanks' smile returned. "But you made me break it."
Arthur's expression softened into a grin.
That was the answer he had been looking for.
Armament Lock wasn't absolute.
Not yet.
Against an opponent whose Haki was powerful enough, Shanks could still force his way out.
But Arthur had discovered something far more important.
He had made Shanks' body hesitate, forcing the Emperor's Armament to submit for even a fraction of a second.
And in a battle between monsters, a fraction of a second could determine everything.
Across the battlefield, Robin watched silently.
She understood what had changed.
Arthur had begun the night learning how Shanks' Haki worked.
Now he was creating techniques capable of challenging it.
Yassop's eyes remained fixed on their captain. "He actually made Shanks stop."
Beckman answered without looking away. "Not stop."
Yassop glanced at him.
"Submit." Beckman narrowed his eyes.
The word carried through the watching crew.
Hancock's expression remained calm, but a faint smile appeared.
Arthur had found another weapon.
Not a Devil Fruit.
Not a new sword.
His own Haki.
Shanks raised Gryphon once more.
Arthur raised both blades.
Neither man spoke.
They already understood what came next.
The duel had changed again.
Observation had been contested, Future Sight disrupted, and Armament challenged.
And now both Emperors understood that their Haki could no longer be treated as merely an enhancement to swordsmanship.
It had become the battlefield itself.
Shanks took a slow breath.
Arthur did the same.
Then both disappeared.
The next exchange erupted with such speed that even the strongest observers struggled to follow it. Steel collided repeatedly through the darkness, while black lightning flashed between every movement. Arthur's twin blades attacked from opposing angles, forcing Shanks to divide his attention between two simultaneous threats, yet Shanks' single sword moved with extraordinary precision, each motion cutting away the advantage Arthur's Nitoryu created.
For several minutes, neither gained control.
Both adapted with every exchange, until their rhythm became increasingly difficult to distinguish as Future Sight, Observation Kill, Armament, and Conqueror's Haki intertwined with every sword stroke.
Then Arthur noticed something.
Shanks wasn't fighting merely to survive.
He was waiting.
Waiting for Arthur to reach the next step.
Arthur's eyes narrowed.
He wants to see how far I can go.
The realization brought a faint smile to his face.
Then Arthur tightened his grip around both swords.
Fine.
The next exchange would no longer be about matching Shanks' Haki.
It would be about proving that he could finally fight on Shanks' level.
The realization settled over Arthur with unexpected clarity.
He had spent the entire duel responding to Shanks—studying his movements, adapting to his Future Sight, disrupting his Observation, and gradually finding ways to challenge the overwhelming control behind his Armament. Yet the longer the battle continued, the more obvious the truth became.
Shanks was not simply a swordsman wielding powerful Haki; his swordsmanship had been forged around it.
Every movement of Gryphon carried his will. Every change in rhythm was supported by Observation. Every collision was reinforced by Armament. Every decisive exchange threatened to erupt beneath the pressure of his Conqueror's Haki.
Arthur had seen strong swordsmen before.
Shanks was something else.
He had reached a point where the boundary between swordsmanship and Haki had almost disappeared.
Arthur's eyes narrowed.
So this is why you were Mihawk's rival.
The thought came naturally.
Mihawk's name had always represented the highest standard of swordsmanship. Yet standing before Shanks, Arthur finally understood why the red-haired Emperor had once been able to stand against the world's greatest swordsman as an equal rival.
Shanks did not need a second sword.
He did not need a Devil Fruit.
He had turned one blade into an extension of his entire existence.
Across the battlefield, Arthur's expression remained focused. "I understand why Mihawk respected you."
A faint glint appeared in Shanks' eyes.
"That's a dangerous thing to say."
"Why?"
"Because now you'll start expecting too much from me."
Arthur laughed quietly. "Isn't that what you wanted?"
"Perhaps." Shanks' smile widened.
Neither man moved.
Then Arthur stepped forward, and the duel resumed.
This time, Arthur changed the way he fought.
He no longer tried to imitate Shanks' rhythm or force his way through the Emperor's defense. Instead, he began creating his own rhythm, combining the advantages of two blades with the principles he had learned throughout the battle.
His right sword attacked high.
His left remained low.
Shanks blocked the first.
Arthur immediately changed the angle of the second.
Gryphon intercepted.
Arthur twisted his wrist.
The first blade returned from the opposite direction before Shanks could fully recover.
CLANG!
Shanks' eyes sharpened.
He stepped back.
Arthur followed.
One blade controlled the distance while the other searched for an opening. Whenever Shanks attempted to predict the next movement through Future Sight, Arthur disrupted the connection with Observation Kill, forcing him to rely on instinct and direct perception.
For the first time, Shanks' predictions became less absolute.
Arthur's attacks no longer formed a sequence that Shanks could simply read from beginning to end.
They became possibilities layered over possibilities.
One movement created another.
One sword concealed the intention of the second.
And behind both was Arthur's Haki, constantly changing the pressure of the exchange.
Shanks blocked.
Arthur redirected.
Gryphon swept toward Arthur's neck.
Arthur lowered his body.
The blade passed overhead.
His right sword struck upward.
Shanks turned Gryphon aside.
Arthur's left blade immediately followed.
Shanks twisted his body.
The edge passed across his coat.
A small tear appeared.
Arthur did not stop.
He advanced again.
Shanks answered.
Their blades collided repeatedly, each impact sending sharp cracks through the ruined battlefield.
From the sidelines, Kuina watched without blinking.
"Arthur's changing his attack pattern."
"He stopped following Shanks' rhythm." Law nodded.
"He's creating his own." Robin's eyes remained focused on the duel.
Sabo looked toward the battlefield. "That's why Shanks' Future Sight isn't giving him the same advantage anymore."
"Arthur isn't trying to hide one attack anymore. He's making the result of each exchange uncertain until the last possible moment." Robin nodded.
Beckman listened silently.
He had reached the same conclusion before the others.
Arthur was adapting.
Not merely to Shanks' swordsmanship, but to the way Shanks processed a battle.
That was what made the situation dangerous.
A swordsman could be studied, and a pattern could be learned. But an opponent who constantly changed the structure of the battle became increasingly difficult to predict.
Shanks suddenly accelerated, forcing Arthur's attention to sharpen with him.
Gryphon came toward his shoulder.
Arthur blocked.
The impact forced him sideways.
Shanks followed with a second strike.
Arthur caught it with his other sword.
A third came immediately.
Arthur crossed both blades.
BOOM!
The force sent him backward.
He dug his feet into the ground and stopped himself.
Shanks was already there.
Arthur raised one sword.
Gryphon struck.
Arthur's second blade moved at the same time.
Instead of blocking the attack, he redirected it.
The two blades slid against one another.
Arthur stepped inside Shanks' reach.
His shoulder nearly touched Shanks' chest.
For an instant, Shanks' Future Sight revealed the next movement.
Arthur would attack from the left.
Shanks prepared to counter.
Then Arthur's Observation Kill activated.
The prediction vanished.
Shanks' eyes widened.
Arthur changed direction.
His right sword stopped before Shanks' chest.
His left blade came from the opposite side.
Shanks barely avoided both.
The red-haired Emperor retreated several steps.
Arthur didn't pursue immediately.
He stood still.
The realization was unmistakable.
He had finally reached the point where Shanks could no longer rely entirely on Future Sight to dictate the exchange.
Shanks looked at him.
Then he laughed.
"Now that's interesting."
Arthur smiled.
"You wanted to know how far I'd come."
"I did."
"Then keep watching."
Shanks lowered Gryphon.
His expression became calmer.
More focused.
The playful pirate who had shared drinks with Arthur's crew seemed distant now.
He had recognized the change.
Arthur was no longer simply surviving against him.
He was beginning to match him.
Shanks' Conqueror's Haki surged.
Arthur answered.
The pressure collided before either blade moved.
The sky above them darkened.
Black lightning spread between the clouds.
Neither man gave ground.
Then Shanks stepped forward.
Arthur did the same.
Their swords met.
CRACK!
The collision did not produce a conventional shockwave.
Instead, the surrounding air seemed to collapse inward for an instant before exploding outward.
Arthur felt the force travel through both arms.
He didn't resist it directly.
He redirected it.
His Armament flowed through the blades.
His Conqueror's Haki followed.
The pressure wrapped around Shanks' Armament once more.
Armament Lock.
Shanks recognized it immediately.
He forced his Haki outward before Arthur could establish complete control.
The two forces collided.
Arthur's boots dug into the earth.
Shanks' stance shifted.
Neither yielded.
Then Arthur pushed harder.
For a brief moment, Shanks' sword arm lowered.
Only slightly.
But it was enough.
Arthur's eyes sharpened.
He had done it again.
Shanks broke the Lock with a burst of Conqueror's Haki and immediately counterattacked.
Gryphon swept across Arthur's chest.
Arthur twisted away.
The blade passed through the space where his body had been.
Arthur's right sword struck.
Shanks parried.
The left followed.
Shanks ducked.
Arthur rotated.
The first blade returned.
Shanks blocked.
The exchange became a storm of steel.
One sword against two.
Future Sight against Observation Kill.
Armament against Armament Lock.
Conqueror's Haki against Conqueror's Haki.
Neither technique was absolute.
Neither advantage lasted long.
Yet Arthur's movements had become noticeably sharper.
He was beginning to understand Shanks' timing. More importantly, he was beginning to impose a rhythm of his own.
For the first time, Shanks was forced to react to Arthur's rhythm rather than simply dictate the pace.
A final collision sent both men apart.
Arthur landed several meters away.
Shanks came to a stop opposite him.
Both were breathing harder now.
Their clothes were torn in several places, and small cuts marked their bodies, but neither had suffered a decisive injury.
Around them, the battlefield had become almost unrecognizable.
The forest had been carved apart.
The harbor was partially destroyed.
The ground was covered in craters.
The sea continued crashing against the shattered remains of the pier.
Arthur looked around briefly.
Then he returned his attention to Shanks.
A faint smile appeared.
"This is going to take a while."
Shanks laughed.
"That's what happens when two stubborn men refuse to lose."
Arthur rotated both swords in his hands.
"Then we should stop pretending this is going to end quickly."
Shanks' expression sharpened.
Arthur's smile disappeared.
His grip tightened.
Until now, he had fought with nothing but his two swords and Haki.
He had learned.
Adapted.
Broken through barriers he had never understood before.
He had discovered Observation Kill.
He had developed Armament Lock.
He had begun matching the rhythm of an Emperor who had reached the summit of the New World without relying on a Devil Fruit.
But there was still one thing Arthur had not used.
Not because he had forgotten it.
Because he had deliberately kept it hidden.
His Devil Fruits.
Shanks noticed the subtle change in Arthur's presence.
The pressure around him was no longer increasing through Haki alone.
Something else was beginning to awaken.
Arthur lowered his swords slightly.
The first faint light of dawn appeared beyond the horizon.
The darkness of the night began to retreat.
Shanks looked toward the eastern sky. "Morning already?"
"Looks like we've been fighting longer than we thought." Arthur's eyes remained fixed on him.
A thin line of golden light appeared across the sea.
The sun was beginning to rise.
For a moment, neither Emperor moved.
Then Arthur slowly sheathed one of his swords.
Shanks' eyes narrowed. "You're putting one away?"
Arthur shook his head.
"No." He rested his hand against the other sword. "I'm changing the rules."
A strange sensation spread through the battlefield.
Shanks' expression became serious.
Arthur's body began to change.
Darkness gathered around his silhouette.
His Haki remained present, but beneath it something far more sinister stirred.
A faint crimson glow appeared beneath Arthur's skin.
Shanks' eyes widened.
"That's..."
Arthur looked toward the rising sun.
The golden light illuminated his face.
Then his eyes changed.
His pupils narrowed.
A sharp smile slowly appeared.
The crimson glow spread through his veins. It was blood—but not ordinary blood. The power of the Blood-Blood Fruit was beginning to awaken within him.
Shanks tightened his grip around Gryphon.
For the first time since their duel began, he looked genuinely surprised.
Arthur raised his eyes toward him. h
"You wanted to see how far I've come." The crimson aura intensified. "Now I'll show you."
The sun finally broke above the horizon.
Beneath the first light of dawn, the battle between the two Emperors was about to enter an entirely different realm.