One Piece - Heaven Defying Comprehension!

"Boom!"

With a mere thought from Ace, the fire clouds in the sky began to contract and vibrate violently.

"Whoosh!"

As the fire clouds condensed, a torrential downpour began—not of water, but of fiery rain, radiating intense heat. The earth, already burning like a scene from purgatory, seemed to ignite even further as the fire rain acted like a catalyst, amplifying the raging flames.

The immense heat engulfed the entire battlefield, with flames spreading across every corner of the island.

"Bah! Crackling!"

Suddenly, deep within the inferno, a violent black-purple aura flickered.

Moments later—

"Boom! Crack!"

A surge of black and purple lightning exploded from within the flames, representing the ultimate power of the sea—Conqueror's Haki. The lightning, entwined with the sea of fire, merged with its violent force.

"Bah! Pi!"

The endless flames, now interwoven with black and purple lightning, unleashed their terrifying energy, causing the atmosphere to tremble. The sky fractured like shattered glass, and the entire Ice and Fire Island quaked, as if an earthquake had struck.

"Fuck! Conqueror's Haki has fused with the power of the Mera-mera Fruit?!"

Aokiji's eyes widened in shock at the overwhelming power before him that he couldn't help but curse. This wasn't just an ordinary combination of abilities; Conqueror's Haki had fused with the destructive force of the Mera-mera Fruit, amplifying its already violent nature.

Cold sweat trickled down Aokiji's forehead as he witnessed this unprecedented display of power.

"This surpasses even Sakazuki's Lava Devil Fruit!"

In the Devil Fruit Encyclopedia, Sakazuki's Lava-Lava Fruit was hailed as the most destructive of all. It granted him unmatched offensive capabilities, allowing him to fight even those who wielded Conqueror's Haki. But now, Ace had surpassed that destructive might with his own fusion of Conqueror Haki and Fire.

Aokiji's expression grew grim, exhaling a frosty breath.

"It's not over yet, Aokiji."

Ace grinned at the sight of Aokiji, who had begun amassing the power of his Frozen Fruit and Armament Haki. This display of strength would be enough to overwhelm most admirals—but not Aokiji, one of the strongest to ever stand against the Four Emperors.

Ace's eyes sharpened as his muscles tensed.

"Buzz!"

Power surged from every cell in Ace's body, so intense that it seemed to materialize into visible energy.

"Creak!"

Ace concentrated all of his physical strength into his left fist, which crackled with violent thunder as Conqueror's Haki wrapped around it.

"Hakoku!"

He condensed the overwhelming power into his fist, grinning at the shocked expression on Aokiji's face.

"That's… the technique of the Giants!"

Aokiji was incredulous. Ace had somehow mastered Elbaf's most powerful spear technique—Hakoku. But how? Hakoku was traditionally a combination attack, requiring two giants to perform. Has Ace improved it to wield the technique alone?

Sweat dripped from Aokiji's forehead.

"What a terrifying talent…"

The giants were an ancient and powerful race, feared across the seas. Their kingdom, Elbaf, was considered the mightiest nation in the world. And Hakoku was their greatest spear technique, a symbol of their strength.

Now, Ace was using it alone—combining it with the power of the Mera-mera Fruit and Conqueror's Haki.

Aokiji couldn't help but compare Ace to Rocks, the infamous pirate who once dominated the seas forty years ago. The current Four Emperors—Kaido, Big Mom, and even Whitebeard—had once served under Rocks, an overlord so fearsome that the Marines had to join forces with Roger to bring him down.

"Is Portgas D. Ace the next Rocks D. Xebec?" Aokiji wondered, his mind racing. "Or is he even more dangerous?"

The same initial "D," the same overwhelming ambition to rule the world. Ace was not just a mere successor—his talent was beyond anything even Rocks had possessed. At such a young age, Ace had already achieved power comparable to the top figures in the world.

Aokiji's heart pounded as he thought of the chaos that could unfold if Ace continued to grow. They couldn't allow him to become another Rocks.

"Whoosh! Click, click, click!"

Aokiji's right arm turned to ice, fully elemental.

"You're too dangerous, Portgas D. Ace. A man like you… should be locked away in Impel Down."

His tone was cold and resolute as he stared at Ace, who stood amidst the sea of fire.

"Hahaha! Impel Down? I don't belong in a place like that. My destiny is to reign in the heavens!"

Ace's laughter echoed through the air, and the black and purple lightning surrounding him grew even more intense.

"Whoosh!"

Aokiji exhaled a chilling breath as his eyes took on a glacial cyan hue. Above, the freezing clouds began to contract and vibrate just like the fire clouds.

As the hail and ice began to fall, the freezing air filled the atmosphere, capable of turning anything to ice with a single breath.

The frozen world began to rage.

Frozen Fruit had awakened, and its power over nature was fully unleashed. All the freezing energy in the atmosphere condensed around Aokiji's right arm.

"Whoosh!"

The cold was so intense that it caused the surrounding air to freeze into droplets. Aokiji's right arm was covered in dense black Armament Haki as the freezing power concentrated.

"Buzz!"

The Haki, so thick it seemed tangible, wrapped around Aokiji's elemental arm, creating a whistling sound as it gathered.

His arm turned pitch black.

"You are indeed strong, Portgas D. Ace," Aokiji admitted. "Give you a few more years, and I wouldn't stand a chance. But right now, I will freeze you and send you to Impel Down. You're too dangerous to be left free in this world."

Aokiji's eyes gleamed with intense coldness as he looked at Ace, standing in the heart of the raging sea of fire. 

The power Ace wielded was undeniably strong — the fusion of Conqueror's Haki and the Mera-Mera Fruit was a deadly combination. Then there was Hakoku, Elbaf's strongest spear, now modified to be wielded by a single individual. These were fearsome attacks, on par with the abilities of an Admiral. 

But Aokiji wasn't just any Admiral — he was one of the strongest in history. He had stood toe-to-toe with the true emperors of the sea, the Four Emperors. Even though he adopted a stance of "lazy justice" after the incident at Ohara, his resolve had never weakened. Instead, he had waited for his moment, continuously honing his strength.

His mastery of Armament Haki had grown even sharper over time. Even when faced with Sakazuki's Lava-Lava Fruit, reputed to be the most destructive of all Devil Fruits, Aokiji remained unfazed.

He acknowledged Portgas D. Ace's exceptional talent. To have developed Admiral-level combat abilities at such a young age was unprecedented in the history of the sea. But it was precisely Ace's youth that left him vulnerable — he hadn't yet reached his full potential. Confident in his own strength, Aokiji was certain he could counter the two attacks Ace had launched.

"Send me to Impel Down?" Ace repeated with a wry smile, before bursting into a Haki-filled laugh. 

Aokiji was powerful, no doubt about it. He had battled different kinds of opponents and possessed Armament Haki stronger than Ace's. The concentrated energy in Aokiji's right arm was formidable, and Ace knew that his two attacks wouldn't be enough to match its overwhelming power.

But Ace's grin widened. "Do you think those attacks were just a display of power, Aokiji?"

A flash of thick, purple-black lightning flickered in Ace's eyes, and Aokiji's expression shifted to one of shock, his pupils shrinking.

"Let me show you what real power looks like," Ace said, laughing as he reached into the air with his right hand and clenched his fist.

Buzz! Boom!

The atmosphere, already saturated with intense heat, now crackled with a terrifying sea of fire, interwoven with black and purple lightning. 

Ace compressed this chaotic energy, condensing it into a red, black, and purple sphere that enveloped his right fist. 

"The Great Flame Ring — Dominion of the Seas!"

Ace held this volatile power in his right hand, grinning.

And then... 

To Aokiji's utter disbelief, Ace combined Hakoku, held in his left hand, with the Great Flame Ring in his right. Slowly, he advanced toward Aokiji.

The air grew cold as Aokiji's face turned grim, his disbelief palpable.

"You monster..." he muttered. 

A deafening roar echoed from Ace's fists, and as his energy swelled, Aokiji watched in horror.

——

Ace's eyes suddenly dimmed at this moment. His mind flashed to another place, another time. He saw a desolate land, and standing upon it were his brother Luffy, Kid, Trafalgar Law, and Zoro, all staring in terror at something ahead.

"Kaido!!" a voice shouted.

A hulking figure wielding a mace laughed thunderously, his weapon cloaked in violent black and purple lightning.

——

Ace blinked. The scene faded, and he was back in the present.

"Your understanding is heaven-defying, and you have some understanding through visualizing Four Emperors Kaido and Charlotte Linlin's combined skill to dominate the sea."

"Deduce and comprehend exclusive skills!"

"Use your right fist as a sword and your left fist as a spear!"

At that moment, Ace's newfound knowledge crystalized.

He looked down at his fists.

Left hand — the mightiest spear of Elbaf.

Right hand — the ultimate fusion of the Mera-Mera Fruit, Conqueror's Haki, and Garp's Iron Fist.

"Now... it's time to unleash everything!"

He bellowed, his voice reverberating through the air. 

The black-purple lightning of Conqueror's Haki wrapped around his flames like a terrifying shield, and with it came the shockwave that could destroy anything in its path.

"Conqueror's Haki, physical energy, and the Mera-Mera Fruit's ultimate release! The Great Flame Ring — Dominion of the Seas!"

Aokiji's eyes widened in shock, his face pale. "You monster."

The two devastating attacks had merged into one unstoppable force. Without hesitation, Aokiji called upon all his power — his Frozen Fruit, his Armament Haki — everything.

"Ice Age: Ice Phoenix!"

A colossal ice phoenix burst from Aokiji's arm, vast enough to blanket the sky. It flapped its wings, sending a freezing air that could turn the world to ice.

And then, the inevitable collision came.

The fiery red, purple, and black of Ace's Haki clashed with the icy black and blue of Aokiji's Armament and Frozen Fruit, like two opposing forces of nature.

BOOM!

The island beneath them trembled. The air itself shattered, splintering like glass, as if the world couldn't contain the magnitude of their clash.

The entire island, along with the sea surrounding it, was engulfed in mass destruction.

The Merry, which was anchored far in the distance, rocked violently, nearly capsizing under the sheer force of the explosion.

"What... what kind of monstrous energy is this?" Nami, standing at the helm, gasped as she struggled to keep the ship steady.

Gradually, the energy began to fade, but when the dust cleared, the island was gone. Obliterated.

The girls aboard the Merry looked on in shock. 

"Ace... Ace!" they called out, their voices shaking with emotion.

And then, from the sky, a red figure descended. 

Tears welled up in their eyes as they recognized him.

"Ace!"