One Piece: Lightning's Heir

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BOOOOOM!!!

Arthur stomped his foot, the air itself seeming to crack under the force of the blow, his massive Thunder God form a beacon of crackling blue energy as he hurtled towards Big Mom, his speed like a laser beam.

The clear sky above darkened, storm clouds gathering, lightning flashing, the wind whipping through the air.

He appeared before Big Mom in a flash, his lightning-wreathed fist cocked, the pressure of his attack so intense that the massive wave beneath Big Mom seemed to shrink—

Big Mom, her own fist charged with the combined power of Zeus and Prometheus, met his attack head-on, her massive form, buoyed by the wave, an immovable object.

BOOOOOOOOOOMMM!

Their fists collided, the impact echoing across the sea, the force of it parting the waves, the air distorting, a torrential downpour erupting from the churning sky.

The rain, however, couldn't penetrate the barrier of force created by their clash, the droplets repelled, scattered by the shockwave.

The attack seemed to have no effect on either of them.

Arthur had never faced such a resilient opponent.

The Sabaody ambush had been a one-sided affair—he'd been overwhelmed. Garp, his fists like mountains, even with Arthur's Isolation Field.

That battle had ended in a draw, both exhausted, their strength spent.

His fight against Roger on Risky Red, the ailing Pirate King past his prime—that had been exhilarating. Arthur, unleashing the full fury of his powers, had been the first to fall, his stamina depleted.

But this fight with Big Mom—His attacks couldn't penetrate her defenses, and her own attacks seemed equally ineffective against him.

It was a stalemate...

If this continued, it could last for days, perhaps even weeks.

Zzzzzzt!

The lightning crackling around Arthur's body intensified, the chaotic energy converging, condensing in his hand.

Raigo, his most powerful attack, required time to charge. His army of lightning beasts, while impressive, drained his stamina too quickly, and couldn't hurt Big Mom.

Divine Judgment was like a mosquito bite to her, the Electromagnetic Railgun easily dodged at this distance.

His only option—a blade of solidified lightning, its cutting power unmatched.

His Thunder God form, now over thirty feet tall—the Lightning Cleaver he'd used against Onigumo was the perfect weapon.

The lightning coalesced, forming a massive, shimmering blue blade, twenty feet long, its light so intense it was almost painful to look at.

Bzzzzzzzz!

The blade hummed like a thousand angry bees. Arthur, wielding the massive weapon, his footfalls shaking the air, swung, his attack aimed at the monstrous wave beneath Big Mom.

CRAAAAAASH!

The wave, unable to withstand the force of the blow, split in two, the souls animating the water dispersing, unable to maintain their form—collapsing back into ordinary seawater.

Big Mom, unfazed by the wave's collapse, as she fell, unleashed a punch—a blast of compressed air, enhanced by the rain—hurtling towards Arthur.

——

"He's…incredible! So strong!"

"Fighting Big Mom to a standstill…"

The battle raged, neither gaining an advantage, each attack a force of nature.

The shockwaves alone had sunk over a dozen ships, several underworld bosses caught in the crossfire, and countless others on Whole Cake Island killed by Big Mom's sonic screams.

The power of the New World's Emperors was legendary—island-destroying, nation-crushing, a force beyond human comprehension.

"This Thunder God Arthur—he's a monster, too. Big Mom's right—He's definitely Emperor material!" The King of Shipping's voice trembled as he watched the battle unfold.

Big Mom's earlier words, her offer to divide the spoils of the New World—it had ignited their ambitions. They'd believed—with their own strength, their own influence—they, too, could carve out a piece of the pie.

But witnessing this clash of monsters—their dreams crumbled.

How could they defend their own territories against this power?

Ambition without strength was meaningless—a fool's errand.

Big News Morgans, despite his vast information network, his dreams of becoming a player in the New World—he was humbled.

The more he knew—the more he understood his own insignificance. He just wanted to survive, to continue his news business, to report on the exploits of the truly powerful—from a safe distance.

He'd already thought of a headline for this battle, assuming Arthur survived. Something like, "SHOCKING: A New Emperor Rises! Thunder God Arthur Devastates Whole Cake Island! Big Mom Battles to a Draw!"

Big Mom's children, those monstrous prodigies—they were the most shocked of all.

They'd assumed Big Mom, on her own territory, her fortress of Whole Cake Island, was invincible.

They knew better now.

Strength spoke for itself.

Even Katakuri, usually so confident, felt a flicker of doubt—Could he even reach Arthur's level?

"No…I'll surpass him. I will reach the top. I am undefeated!" His conviction, his unwavering belief in his own potential, was unshakeable. As long as he had room to grow, as long as his talent burned bright, he would become stronger.

——

One shockwave followed another, the battle relentless.

It surpassed even Arthur's clash with Roger in both duration and intensity.

Ten days and ten nights.

Neither yielded.

Arthur couldn't penetrate Big Mom's defenses, her Soul-Soul Fruit's versatility countering his every attack, her iron balloon exterior impervious to his lightning. And Big Mom, despite her overwhelming power, couldn't land a decisive blow on Arthur, his speed and resilience frustrating her efforts.

Finally, after ten grueling days, Whole Cake Island was gone, reduced to rubble, only the small piece beneath Big Mom's feet remaining.

Arthur, hovering unsteadily in the air, his Thunder God form gone, his long hair plastered to his forehead with sweat, his breathing ragged—

"Ha…ha…" His laughter was hoarse, strained.

Big Mom, her massive form slumped onto the last remaining piece of chocolate ground, too exhausted to even lift a finger—

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