One piece, rewarded thunder fruit at the beginning

Amber bowed deeply and sincerely.

"I have great admiration for people like Rayleigh who are clear about grievances," he thought, "because I can't do it myself. If someone hurts someone I care about, I won't care about their reasons or whether it's justice. I'll drive the Gundam and take revenge."

...

Under Shakky's powerful intelligence network, Amber quickly found a nearby uninhabited desert island.

On one hand, the damage range of their battle was too wide. On the other hand, they wanted to avoid alerting the Marines on the Sabaody Archipelago.

Although Amber wasn't afraid, he found them disgusting, like flies.

On the uninhabited island, Amber and Rayleigh stood far apart. The others watched from the Thor, not far away.

Amber observed Rayleigh carefully. Despite being over 70 years old, Rayleigh was still very strong. Oda once explained in the SBS that Rayleigh's strength, when he was young, was very close to Roger, the Pirate King. Not only is he skilled in swordsmanship, but he also possesses Conqueror's Haki and is a master of it.

In the original work, he fought Marine Admiral Kizaru to save Straw Hat Luffy and his gang, and even swam through the Calm Belt with his bare hands. His strength is terrifying. However, his weakness is his age—his physical endurance can't keep up, and he can't fight a protracted battle. This might be the key for Amber to win.

As Amber observed Rayleigh, Rayleigh was also observing Amber, and the two were locked in a confrontation.

"God's Sanction!" Amber decided to strike first and raised his hand to shoot a lightning column several meters wide.

Before the lightning could reach Rayleigh, his famous sword, Aurora, swung out a huge wave of sword energy, canceling out the attack.

Rayleigh then stepped on the ground fiercely, flying over in an instant, faster than Marine Six Styles "Shave." He slashed with his sword without delay. Amber turned sideways to avoid the slash, which landed on the ground, tearing it apart and spreading hundreds of meters from Rayleigh.

A trace of cold sweat appeared on Amber's forehead. If he was hit, he might have been cut in half. It seemed the old man had no intention of holding back!

Amber got serious. His right hand was instantly covered with Armament Haki to enhance its hardness, and he gathered a large amount of lightning to enhance its lethality.

"Hell Thrust. Four good skills!" His right hand turned into a palm and stabbed at Rayleigh's shoulder. Rayleigh had no time to dodge and could only barely cover it with his weapon. The sword in his hand also slashed from bottom to top. Rayleigh's shoulder was pierced, and blood instantly appeared. At the same time, Rayleigh's sword cut open Amber's chest, leaving a long scar. The two then suddenly separated.

"Uncle Rayleigh, you're really serious!" Amber said with a faint smile.

"You're not bad either. The rumors that you tied with Aokiji are somewhat true!" Rayleigh replied.

"Then, I'm going to do it for real!"

Amber jumped into the air, raising his hands high to gather the thunder elements around him.

"God's Punishment!"

Dozens of bolts of lightning fell from the sky, bombarding the earth like wild silver snakes. Rayleigh floated like a feather in a strong wind, dodging each strike. The lightning gradually dissipated, leaving the ground plowed and ruined, but Rayleigh was still unharmed.

Even though his level of Observation Haki didn't reach Katakuri's future sight, it wasn't far behind!

"The ultimate move can't hit him. Is close combat my only option?" Amber thought, descending slowly.

Rayleigh swung his sword quickly, creating afterimages and waves of sword energy more than ten meters long, forming a "sword storm." The sword energy tore through the uninhabited island, flattening trees and hills.

Aboard the Thor, Zoro was shocked by Rayleigh's exquisite swordsmanship.

"Is this the swordsmanship of a true master? I... am still far from it!" Zoro thought. He had missed encountering Mihawk two years earlier and had never truly seen the swordsmanship of the top masters until now.

At first, Amber dodged by teleporting, but the sword energy was too dense, and his teleportation couldn't keep up. Each sword energy was imbued with Haki, making elemental attacks useless for defense. Amber was hit on his arms, chest, and face, leaving scars.

"Dammit!" Amber yelled angrily, rushing towards Rayleigh and resisting the sword energy. He closed his right hand into a fist, bursting with electric light, and punched with all his strength. Rayleigh blocked the fist with his sword, but the impact sent him flying.

Rayleigh flew hundreds of meters, creating a long groove on the ground, smashing trees and rocks. Amber, unyielding, turned into lightning to chase after him, continuously firing thunderbolts.

Rayleigh guided all the lightning away with his sword and faced him head-on.

"Boom——"

Their fists and swords collided, black lightning crackling around them. Powerful air pressure raged, affecting everyone on the Thor.

"I didn't expect little Amber to fight Rayleigh to such an extent," Shakky sighed, though she wasn't worried. No one knew Rayleigh's strength better than her.

"Pong!" "Pong!" "Pong!"

Amber used his fists as weapons. Rayleigh used his sword. They engaged in an offensive and defensive battle for over ten minutes.

"Huh...huh...huh..."

Gradually, Rayleigh began to pant. After all, he was over 70 years old, and his physical strength couldn't keep up. Although Amber's Haki and attack power were inferior to Rayleigh's, his youth and endurance gave him an advantage.

"Pong!"

After another clash, Rayleigh jumped away.

"I'm old. I wanted to test you more, but my strength can't keep up. I'm going to use my real power next, so be careful!"

Amber's eyes sharpened. He knew what Rayleigh was talking about—Conqueror's Haki imbued with Armament Haki.