The Heavens Cracked Open!

"Let's get this shit started, Big Mom!"

"Mamamama! You cocky brats, I guess you're strong enough to hold your ground against me. Alright, I accept your challenge…" Big Mom smirked, her tongue poking out, eyeing the two brothers with a savage grin "I will get serious"

She gripped Napoleon in her right hand and then hopped onto Prometheus before soaring into the sky, with Zeus following closely behind "I'll burn you to death, Zeus fry them both!" 

"As you say Mama!" Big Mom commands Zeus's lightning to strike through the clouds in all directions, bombarding her surroundings with an electrical thunderstorm.

"God of Lightning Tenjin!!"

*Thunder*-*Thunder* When Kid saw, he swiftly dodged them. However, the lightning itself was sentient, and changed direction to strike him and Kai, preventing them from dodging or taking cover.

The two ended up being struck by lightning, Kai didn't suffer any damage because of his cloud body, but Kid was electrified and his skinned was burnt off.

"Ugh--!!…Huff…The lightning can follow targets?" Kid groaned in pain as he regained his composure "I really envy your ability sometimes" he commented after seeing Kai unharmed.

"I still have my weaknesses" the latter responded.

Big Mom was taken aback to see Kai take the attack without a scratch "Huh? Why didn't the lightning hurt you?!"

"Because I'm made of clouds!" Kai stated. He proceeded to create a small sphere of dense yet flexible cloud substance above his hand and then he coated his sword with it before imbuing it with Advanced Armament Haki and Conqueror's Haki.

"Mutation Cloud."

Following that, Kai swiftly propelled himself off the ground toward Big Mom, catching her off guard with a sudden long-range attack before he even closed in on her. He extended the blade of his sword by shaping the clouds, then he swung it wide in order pushed her back with the blunt side of the sword.

<White Blade Sweep>

"He extended his sword?!" Big Mom was taken aback as she swiftly lifted Napoleon to her side, blocking the incoming attack.

Kid swiftly shaped a massive spinning drill on his right arm when he spotted an opportunity. The weapon dwarfed even Big Mom before he enveloped himself in Advanced Armament Haki, casting a crimson aura over his body and weapon, and then he lunged towards Big Mom. 

FWOOOSH!!

"You're wide open!" Kid suddenly appeared in mid-air before Big Mom, swiftly driving his spinning drill towards her chest "Take this…"

"…Giant Heaven Piercing Drill!!"

VROOOOM! THUMP!!

"AUGH--Damn it!!" landed a direct hit on Big Mom's torso, sending her flying and tumbling from Prometheus. While his Haki wasn't all that potent, the blow still managed to inflict pain on her.

"Mama!!" x3.

Napoleon, Zeus and Prometheus all rushed to her after they saw that. However, Big Mom promptly shook her head and stood back up, glaring at the two brothers with hostility "These shitty brats are pretty good, I guess calling them rookies would just be downplaying them" Big Mom remarked as she grabbed Napoleon in her right hand "Let's go Prometheus! Napoleon!"

"Yes Mama!" Big Mom proceeded to turn Napoleon into a seax form and coated him with Haki, and then sat his blade alight with Prometheus's flames, resulting in a weapon that both cuts and burns anything.

<Cognac >

After that Big Mom hoped on top of Zeus and charged towards Kid at high speed and swung Napoleon horizontally at him, resulting in an attack with a tremendous amount of power. Kid tried to dodge, but Big Mom was very fast, landing a solid hit that sent him soaring far away. 

"Hahaba!!"

"AAUUUGHH!!--*CRASH*-!!" Kid plummeted to the ground, spitting out blood as he wheezed from the pain.

Seeing that Kai swiftly approached from behind, he thrust his sword forward, aiming for Big Mom's back. But she was alert and quick to react, sidestepping and tilting her body to evade his blade. Without hesitation, she countered by swinging her own sword, Napoleon, down vertically towards him.

"Haha no Hi!!"

"!!!"

BOOOOM!! Kai was surprised by how fast she moved despite her large frame. He swiftly raised his sword above his head to deflect her attack. The two's blades connected, and the impact of Big Mom's attack created a massive fiery explosion and she managed to overpower him with brute force, sending him crashing to the ground below as well.

CRASH!!

"Mamamama! I was really surprised when I saw you infuse your sword with Conqueror's Haki, don't think you're the only one capable of doing that, Kai" Big Mom peeped down at him with a wicked grin, before she jumped off Zeus and descended towards him, her blade and body radiating with black and red lightning as she infused her sword with Conqueror's Haki.

While descending, she proceeded to raise Napoleon above her head and swung it downwards with great force "Do you really think you have a chance to defeat me?!"

"Watch out!" Kid warned Kai.

"In the end, we only regret the chances we didn't take. I don't want to live my life with regret, that's why I gotta do it regardless of the consequences…there can be no great accomplishments without risks!"

Kai brushed off the pain and swiftly rose to his feet once more, shrugging it off, a savage grin stretching across his face while his eyes flashed red, and his sword crackled with black lighting as he infused it with Conqueror's Haki as well. He proceeded to hold it with both hands before he swung it upwards, towards the airborne Big Mom.

KA-BOOOOOM!! As Big Mom and Kai clashed, their forceful impact sent shockwaves rippling out, demolishing nearby buildings and ripping trees from the ground. The earth cracked and shattered into pieces beneath them as they continued to push against each other with unyielding strength. 

"--HAAAA!!"

"--KAAAA!!"

*Thunder*-*Thunder*--!! Thunder rumbled across the island as red lightning crackled between Kai and Big Mom's swords as they weren't even touching.

"They aren't even touching each other!" Kid observed the clash from the sidelines, remarking as he watched.

*Thunder*-*Thunder*…BOOOOM!! After a brief clash, their confrontation resulted in a stalemate when the lightning sparked by their Conqueror's Haki surged upward, splitting the heavens.

"The heavens cracked open!" Kid looked at the sky with amazement before he smiled "This is a clash of Supreme Kings…" he remarked as he finally understood something "…they're infusing themselves with Conqueror's Haki similarly to Armament Haki, boosting their power immensely"

Kai met Big Mom's gaze, a shiver of excitement running through his body "Huff…Huff…You truly live up to your title, Big Mom. It's gonna be a delight when we take you down"

"Mamamama! Don't even dream about it!...Let's go! Napoleon! Zeus! Prometheus!" Big Mom proceeded to assemble the three homies together, with Napoleon's gladius blade piercing through Prometheus at its base and Zeus at its tip, and Prometheus and Zeus combining their energies, forming several tendrils of lightning and fire that created a large circular ring in between them. 

Then, by swinging Napoleon, Big Mom unleashed the energies in the form of a thin, highly concentrated beam that pierced through Kai's body in an instant and culminated in a large explosion.

.

"Maser Cannon!!"

.

KA-BOOOOM!! Kai was engulfed in a massive explosion, sustaining fire damage and being flung into the air by the attack's force. 

"UWAAGH!!--" 

SWOOOOSH!! ! Right after, Big Mom leapt toward Kai, slashing Napoleon across his chest. He crashed to the ground once more as she descended with another powerful swing, leaving him no time to react and her sword was about to cut through him. 

"Your head is mine!"

"!!!" Kai's eyes widened in surprise as he had no time to dodge. But just as the blade was about to reach him, Kid suddenly appeared between them, blocking her sword with a bulky makeshift metal arm crafted from scraps.

Kid's forehead veins bulged, his face contorting into a frown as he shot a hostile glare at Big Mom "Hoi, you shitty fucking overgrown ugly no neck old bitch…"

Kid looked extremely pissed, his eyes flashed red, and his body started radiating with black and red lightning "…that's my little brother you're trying to kill"

"NANI?!!" Big Mom looked at him disbelieve.

'If I can make my Armament Haki flow around my body then I can use the same concept to make my Conqueror's Haki flow instead of letting it out as a burst' Kid face showed determination.

"Kiddo…"

*Thunder*-*Thunder* Before she knew it, Kid rolled back his right fist which was crackling with lightning as he infused it with Advanced Armament Haki and Conqueror's Haki, and then punched her in the stomach at incredible speed while also emitting a powerful Hasshoken shockwave from his knuckles.

. 

"Black Flash!!!"

.

THUMP!! Big Mom spat blood after taking the punch, hurtling through the air before finally halting herself, grimacing in agony.

<Soru >

FWOOSH! Kid closed on her again before he threw an uppercut, dealing a an immensely powerful punch that sent her flying upwards this time.

"Mama!!" x3

Kai seized the opportunity to deal a direct hit. Leaping into the air above Big Mom, he sprouted multiple cloud arms from his back, each wielding dense cloud swords akin to Shichiseiken. Infused with Conqueror's Haki, he unleashed a rapid barrage of thrusts from various angles, leaving behind a trail of red energy in their wake.

.

"Red Fury!!!"

.

BAM! BAM! BAM! Because of the speed in which Kai thrusted the swords, it appeared like he had dozens of swords attacking Big Mom. After he finished, he quickly manipulated the clouds into his blade, making a gigantic cloud hammer which he imbued with his natural lightning.

Wielding it with two hands, he spun his weapon above his head and then descended to Big Mom, swing his weapon with great force and smashing Big Mom into the ground below with a powerful blow "Destroyed of the World…"

"…Ragnarök!!"

BOOOOM!! The attack was so fast and powerful that it broke the sound barrier and generated a resounding thunderclap. Big Mom sprawled on the ground, groaning in agony under the weight of the damage inflicted by Kai and Kid's relentless strikes.

'Not yet, this is not it…I have to make Haki flow inside her body and damage her from the inside' Kai was trying to learn Internal Destruction in order to cause even greater damage to Big Mom than with Conqueror's Haki alone.

"Huff…Huff…*Inhale*…*Exhale*…Kid, are you used to your awakened power?" Kai breathed deeply and slowly, calming himself before he questioned his brother.

"…Huff…No, it still burns a lot of my energy when I use it. But I'll support you if that's what you're implying" Kid responded, glancing at Kai who looked determined.

"Good, use it along with your Conqueror's Haki to support me. Let's beat the shit out of her!"

"…" Big Mom rose, brushing blood from the corner of her mouth, her expression serious. She then sacrificed a portion of her lifespan to increase her strength "I'll use two years of my own lifespan"

"?!!" As she consumed it, she immediately grew in size and gained extra power. 

"She's gotten even bigger?" Kid noted while calmly watching her.

Big Mom looked at the two pirate captains with a sinister grin while holding Napoleon on her right hand as Zeus and Prometheus flew behind her "It's been decades since I've felt pain like this, you runts aren't bad!! 'Red Demon' Kai!! 'Captain' Kid!! The two of you are serious about taking my throne!!..."

"…Bring it on if you think you have a shot!! I'll show you what it means to be an Emperor!!" 

"And I will show you what the New Generation is capable of!" Kai pointed his sword at her.

"No more holding back…we're going all out!! I don't give a damn what it costs, I'm gonna tear her from that throne!" Kid exclaimed.

'Don't strain yourself…let the unused Haki flow into the target and destroy it from the inside out' With his eyes closed, Kai mentally prepared himself before swiftly reopening them and charging once more at Big Mom.

<White Snake>

He aimed his sword at her and from its tip, he summoned a large cloud snake that wrapped around her body and immobilized her. 

"KAAAA!!!" With a loud battle cry, Kai dashed at Big Mom and slashed her across the chest with his Haki coated sword. As his blade made physical contact with her body, he made his Armament Haki flow into her body and wreaked tremendous internal damage to her while his Conqueror's Haki damaged further as well.

"UGHH--" Big Mom's eyes rolled back and she coughed up blood, reeling from the impact of the attack.

"Mama! You're bleeding!" Napoleon looked at her in worry. She took a few steps back and balanced herself before she tried to retaliate against Kai, but Kid quickly showed up on her side.

His body crackling with magnetic energy, he extended his right arm ahead, aiming his hand at Big Mom which was surrounded with a small magnetic spherical bubble before he used his Awakened power to manifest magnetic properties on Big Mom, greatly increasing her level of attraction and causing her to draw countless pieces of metal from large distances towards him "I'll make you a magnet!..."

"Assign!!"

*Crackles*-*Crackles*-!!!

"--What the hell?! Did I become a magnet?!!" Big Mom was stunned as she was overwelmed by the countless metal pieces flying at her.

BAM! Clang! Clang! One after the other the metal pieces started sticking into her body, including her sword, Napoleon "What?! I'm sticking to Mama!!"

"More! I need more!" Kid kept increasing Big Mom's attraction, making hundreds of weapons, metal pieces and even steel beams that were part of the framework of the buildings of the city fly towards him.

"--AAUUGGHH!!!"

.

"Punk Clash!!!"

.

BOOOM!!! Big Mom was quickly buried underneath a mountain of steel.

…

…

…

Meanwhile,

[Near Totto Land]

A large floating island was making its way inside Big Mom's territory, sitting cross legged at the edge of it is the once legendary pirate, Shiki the Golden Lion, who stood on equal footing with the Pirate King Gol D. Roger.

"Are you sure about this? Big Mom might consider this trespassing as a declaration of war" Dr Indigo stood behind him.

"That hag has gotten old, I won't be surprised if she gets beaten by those brats" Shiki stated while smoking a thick cigar "Jihahahaha! I can only hope those kids would submit to me, otherwise I'm gonna have to kill them before they become a big threat to my future plans. After all..."

"...There can only be one King."