Luffy, how can you become the Pirate King if you don't work hard!

As for Zephyr's belief that his robotic arm is indestructible?

Just as a top swordsman can easily cut through iron by mastering the breath of all things, it is not surprising that Luffy, wielding the supreme grade sword Demonic Intent, has reached this level.

After absorbing a large amount of Moria's shadow experience, his own swordsmanship level had already quietly improved, and he had touched the threshold of cutting iron or even higher.

With Zephyr focused entirely on his fists and Haki, completely unprepared for swordsmanship, Luffy's sudden strike caught Zephyr completely off guard.

"That's really surprising."

Zefa swung his prosthetic limb, which felt slightly lighter now that the mechanical arm was no longer covering it.

"I haven't even used my full strength yet," Luffy grinned. "Are you already about to give up?"

"Don't underestimate us veterans." Zefa grinned maliciously.

He clenched his left fist, which was covered in Armament Haki. His domineering aura spread rapidly from his fist like flowing black liquid, covering his entire forearm and radiating an even more dangerous aura than before.

"If I'm not mistaken, this black sword should be the Black Sword - Demonic Intent, one of the twelve supreme great swords."

"This knife is said to be extremely difficult to wield due to its inherent ferocity, and we haven't heard from it for many years. I never expected it to fall into your hands." Zefa's eyes narrowed slightly.

"Uncle, you really are very knowledgeable."

Luffy was somewhat surprised, not expecting that Zephyr would even recognize this sword.

"Humph!"

Zefa snorted coldly, his prosthetic arm and left fist exerting force simultaneously. "The more amazing talent and potential you display, the more it proves your danger. Therefore, I am even less likely to let you leave today!"

A true strongman can turn any part of his body into a deadly weapon.

Losing the convenient robotic arm is a weakness for Zephyr, but it also frees him from that heavy burden, making him more agile.

However, the enhancement a supreme great sword provides to any powerful individual is immense!

The Black Blade Yoru, the sword of the world's greatest swordsman, Hawkeye Mihawk.

The naginata Murakumogiri, used by Edward Newgate, the Whitebeard, who is known as the strongest man in the world.

Even Ace, the sword of Gol D. Roger, the Pirate King, is a divine weapon of the Supreme Grade Sword level!

Zephyr could sense that Luffy's body, which seemed to have been quite exhausted from the fierce battle just now, actually gained even more power and became more dangerous after he grasped the sword.

"Then let's give it a try!"

Luffy grinned and said, "I'm really looking forward to having a tough opponent like you, Uncle, who can help me solidify the feeling I just got into, and maybe even take my strength to the next level!"

Although Zephyr exerted a strong sense of pressure on him, Luffy could clearly feel that Zephyr's domineering aura, both in quantity and quality, seemed to be significantly different from that of his grandfather Garp.

This is normal!

After all, they are all elderly men; there's no reason why they should all be more perverted than the other.

Grandpa is such a monster, having even one of those is already outrageous!

After losing his heavy mechanical arm, Zefa's burly body seemed to have become much lighter, and his aura became more refined.

He assumed a standard fighting stance, his gaze locked onto Luffy like that of a hawk.

"As you wish, Straw Hat Luffy!"

Having suffered a setback at Luffy's hands, Zephyr lost his mechanical arm, but his attacks became even more ferocious.

His figure vanished from the spot, his remaining left fist clenched tightly, dark Armament Haki coiling around it like a living thing, emitting a heart-palpitating wave. He punched Luffy in the abdomen, sending Luffy flying into the air.

He stared at Luffy, a sinister grin spreading across his face, a mixture of pain and excitement.

"If you want to learn the Overlord's Entanglement technique,"

Zefa clenched his fists at his waist, his muscles tensed, his aura like a volcano about to erupt. "You'd better show me what you've got! Cleverness and a good knife alone can't touch the true essence of this power!"

"Of course,"

Luffy twisted in mid-air, unaffected by the attack, and landed on the deck, his body slightly bent. The black sword, Demonic Intent, hummed softly in his hand, pointing directly at Zephyr. His crimson pupils burned with intense fighting spirit. "Don't die, old man. I still want to learn more from you!"

"Very boastful!" Zephyr growled.

Whoosh!

boom!

Before he finished speaking, Zephyr moved again, his figure disappearing from the spot at an extreme speed. He was clearly using techniques from the Six Powers of the Navy, such as Shave or Moonwalk, to make a short-range burst of speed.

His left fist, covered in top-tier Armament Haki, struck Luffy's abdomen once again with a powerful, unadorned punch, like a black cannonball fired from a gun!

"Well!"

But this time, Luffy wasn't sent flying. Having learned from his previous experience, Luffy grunted, and his rubber belly instantly caved in to an astonishing depth, then wrapped around Zephyr's hand.

"They responded very quickly."

Zefa grinned, but his hand, which was caught in the vortex, remained completely calm, as if his fist was extending forward.

"What is this?!" Luffy frowned.

"Hahaha, kid, don't forget that your Armament Haki is also very strong."

Zefa flashed his gleaming white teeth. "It was a very unwise decision to grab my hand."

The fist seemed to unleash some kind of energy; the violent impact penetrated the elasticity of the rubber and reached straight into the internal organs.

Luffy almost instinctively adopted a defensive stance, using the properties of the Gum-Gum Fruit to absorb some of the impact, but the power of Zephyr's furious attack was simply too terrifying.

Armament Haki, internal destruction!

It is also a way of using advanced Armament Haki.

Luffy was unaware of this and clearly suffered a slight loss.

"If you want to learn Haki, you should first learn how to take a beating! It's the same principle as learning basic Haki; the power is interconnected! If you can't withstand the enemy's attacks, no matter how high your understanding is, it's all just castles in the air!"

Zefa roared, unleashing another burst of power from his fists, "But if you can't withstand the beating, you could very well die here!"

"Fly out of here!"

Zephyr let out a muffled roar and slammed the fist that was pressing against Luffy's abdomen outwards with force, sending him flying like a broken sack!

"puff!"

Having taken the full force of the punch, Luffy finally couldn't suppress his surging blood and qi, and coughed up a mouthful of bright red blood in mid-air.

He wasn't completely unable to dodge, but at that moment he chose to take the hit head-on, trying to use his body to feel and understand the more advanced way of using Haki contained in Zephyr's attack.

As Zefa said, being beaten is for the sake of learning.

But the price of this punch was not small.

"You mustn't fall into the water."

Despite the excruciating pain, Luffy stomped his foot in mid-air, using the Moonwalk technique to briefly float, while simultaneously unleashing the Black Blade: Demonic Intent!

brush!

A massive slash crackling with black and red electric arcs detached from the blade, like a black crescent moon tearing through the sky, hurtling towards Zephyr who had just landed.

laugh! !

The slash swept across the deck, easily cutting a deep, bottomless crack in the sturdy deck as if it were tofu, and seawater instantly gushed out from the crack.

Zefa dodged to the side at the last second, glanced at the gruesome wounds on the ship, and a hint of surprise flashed in his eyes: "This is no ordinary swordsman. Where do you find so much time to study swordsmanship, kid?"

As far as Zephyr knew, that old guy Garp wasn't some kind of swordsman; his fighting style had always been straightforward, iron-fisted.

Could it be Bogart, the one who's always with Garp?

That guy's swordsmanship is decent, but he doesn't seem like the type to be able to train a swordsman of this caliber.

Furthermore, would Garp allow his grandson to primarily pursue the swordsman path?

It's absurd to even think about it.

"Time can always be found if you squeeze it in."

Luffy steadied himself, wiped the blood from the corner of his mouth, and almost gritted his teeth when he heard these words.

Only he and the damned "One Piece Training Program" knew the hardships he had endured.

Every minute and second of his time was squeezed out from grueling training and study.

However, it cannot be denied that Moria also played a significant role in this; his shadow was indeed quite similar to an experience pack.

Just as Zephyr dodged the attack, Luffy pushed off the ground again with his legs, causing the air to explode. He plummeted like a meteor, landing on top of Zephyr's head, and his black sword, covered in Haki, slashed down once more!

Zephyr's eyes narrowed, and he subconsciously extended his left fist, which was covered in Armament Haki, to clash head-on with the black blade.

But just as the two were about to touch, Luffy flicked his wrist, and the Black Blade Demonic Intent shrank at a strange angle, turning into a pitch-black dagger, which he then tossed upwards!

"Um?!"

Zefa was taken aback.

During the battle, the black sword could change size at will.

Zefa quickly realized something.

He could also see that Luffy was indeed a swordsman, but he only used it as a means of attack, and mostly used his fists.

Sure enough, Luffy's real killer move was his other hand, his right fist, which was poised to strike, already spinning rapidly and igniting with intense flames.

"Rubber Jet Fire Fist Gun!"

"drink!"

Zephyr instantly realized he had been feinted. With his extensive combat experience, he reacted swiftly, immediately abandoning the sword duel and crouching down to narrowly avoid the fiery fist. At the same time, his right prosthetic arm, covered in Armament Haki, was aimed at Luffy's ankle, which he couldn't retract in time!

On the prosthetic limb, the jet-black Armament Haki flowed like a black whirlwind, emanating an even more dangerous aura than before.

This is a high-level application of Armament Haki, Ryuo!

boom!

A single, decisive blow.

Chapter 289 Has he really mastered the Overlord Entanglement technique?