Chapter 518: The Mysterious Battle of the Hidden Mist Island and the Trouble with the Secret Treasur

After leaving the cold sea, Luffy and his companions continued sailing, and soon they arrived at an island shrouded in thick fog all year round. The trees on the island were tall and gloomy, and the branches and leaves were looming in the fog, as if hiding countless secrets.

"This place looks spooky, there must be a lot of interesting things waiting for us!" Luffy rubbed his hands excitedly and jumped off the boat first. His companions followed reluctantly and stepped into this mysterious place cautiously.

They walked along a rugged path, the fog was getting thicker and thicker, and it was almost pitch dark. Suddenly, a sinister laugh echoed around, making people shudder.

"Who is it? Come out if you dare!" Luffy shouted. The laughter stopped abruptly, and then a group of black shadows rushed out from the woods. These black shadows were agile and very fast, and surrounded them in the blink of an eye.

When the shadows approached, they could see clearly that they were a group of ninjas in black night clothes. The ninjas held sharp blades, had cold eyes, and exuded a murderous aura.

"You outsiders, how dare you break into our Kirigakure Island? Today is your doom!" The leading ninja said coldly. Luffy was not afraid at all, grinning: "Then come and give it a try!"

The battle broke out instantly. Luffy stretched out his rubber arms and attacked the surrounding ninjas like a whirlwind: "Rubber? Storm!" His arms waved quickly in the air. The ninjas dodged one after another, but many were still hit and flew out.

Zoro then drew out three swords and performed the fierce Three Swordsmanship: "Three Swordsmanship? Leopard Kotodama!" With a flash of the swords, the ninjas' weapons were cut off. They looked at Zoro in astonishment, but quickly launched a new round of attacks.

Sanji moved flexibly in the air using the Moon Step and kicked out powerful flaming kicks with his legs: "Devil's Wind Kick? Devil's Dance!" The flames burned in the mist, illuminating an area around them. The ninjas were forced back by the flames, but they also outflanked them from other directions.

Nami summoned lightning with the weather stick and struck the group of ninjas: "Thunder Dragon!" Lightning streaked through the mist and hit several ninjas. They cried out in pain, but more ninjas continued to charge fearlessly.

Usopp took out various special ammunition and fired at the ninjas: "Impact Star Bomb!" The bombs exploded in the group of ninjas, raising a cloud of dust and temporarily blocking their offensive.

Chopper transformed into a giant form and slammed his body into the ninjas: "Chopper Heavy Smash!" His huge body was like a tank, knocking down the ninjas one after another.

Robin used the power of the Hana-Hana Nomi to grow arms under the feet of the ninjas and trip them: "Hundred Flower Rumble!" Countless arms stretched out from the ground and grabbed the ninjas' ankles, making them unable to move.

Franky used laser beams to attack ninjas in the distance, while Brook used soul sound to interfere with their movements, making their attacks slow and chaotic.

In the fierce battle, they found that these ninjas were good at hiding their bodies and using fog to launch sneak attacks. So Nami used the weather stick to create a strong wind, which blew away part of the fog and made the ninjas lose their cover.

Luffy and his companions took the opportunity to launch a more violent attack and gradually gained the upper hand. However, just when they thought they were about to win, the ninjas suddenly performed a mysterious ninjutsu. They formed seals with their hands and chanted something, and the surrounding fog quickly gathered to form a huge fog monster.

The beast opened its bloody mouth and rushed towards Luffy and the others. Luffy rushed forward without hesitation and wrapped his rubber arms tightly around the beast's mouth: "Rubber? Bite!" He pulled hard, trying to stop the beast's attack.

Zoro, Sanji and others also attacked the giant beast's body. Zoro's sword flashed across the giant beast, and Sanji's flaming kick caused part of the giant beast's body to dissipate.

Nami used the weather stick to summon cold air currents, trying to freeze the behemoth: "Ice Wind!" Usopp took out a specially made "behemoth penetrating bomb" and fired it at the behemoth. The bomb exploded inside the behemoth, causing it to roar in pain.

Chopper transformed into a special form and used his antlers to attack the monster's eyes. Robin used the power of the Hana-Hana no Mi to grow arms inside the monster and destroy its internal structure. Franky used laser beams to attack the monster's vital parts, and Brook used the sound of the soul to interfere with the monster's actions.

With everyone's concerted efforts, the fog monster was finally defeated and turned into a cloud of mist and dissipated in the air. Seeing that the situation was not good, the ninjas fled.

Luffy and his companions continued to go deeper into the island, and they found an ancient ninja village. The houses in the village had a unique architectural style, and the walls were engraved with various ninjutsu patterns and texts.

In the center of the village, there is a huge Ninjutsu Tower. The gate of the tower is closed, and there is a strong energy wave around it. Luffy and others tried to open the gate, but found that there was a complex seal on the door.

Robin studied the seal carefully and said, "This seal requires specific ninjutsu hand seals and mantras to unlock. I have seen similar records in an ancient book, but I'm not sure if it is feasible."

So, the partners began to recall and try various possible combinations of ninjutsu. After some effort, they finally found the right way. Luffy followed Robin's instructions, made seals with his hands, and chanted the ancient formula. The door slowly opened, and a dazzling light shot out from inside.

They walked into the Ninjutsu Tower and found it filled with various Ninja Tools and Ninjutsu Secret Manuals. On the top floor of the tower, there was a Ninjutsu Crystal emitting a mysterious light. This crystal contained powerful Ninjutsu power and was said to give the user extraordinary abilities.

"This thing looks powerful. Should we take it away?" Luffy asked curiously. Robin thought for a moment and said, "The power of this crystal is too strong. If it falls into the hands of the wrong people, the consequences will be disastrous. We'd better seal it up or find a suitable place to store it."

Just as they were discussing how to deal with the Ninjutsu Crystal, they suddenly heard a commotion outside. They walked out of the Ninjutsu Tower and saw a group of pirates fighting fiercely with the ninjas. It turned out that these pirates heard that there was a treasure on the Mist Island, so they came to rob it and happened to meet Luffy and others.

Luffy and the others joined the battle without hesitation, fighting the pirates together with the ninjas. Luffy attacked the pirate ship with his rubber arm: "Rubber? Giant Spear!" His arm stretched out like a giant spear, breaking the mast of the pirate ship.

Zoro and Sanji boarded the pirate ship and started close combat with the pirates. Zoro's sword flashed among the pirates: "Three sword styles? Secret? One? Three thousand? The world!" The pirates fell one after another, and Sanji's fire kick made the pirates fall into chaos: "Devil Wind Kick? Hell Flame!"

Nami used the weather stick to control the weather, creating strong winds and huge waves, which overturned the pirate ship. Usopp took out the newly invented "Pirate Buster Bomb" and fired it at the pirates. The bomb exploded in the pirate group, causing them heavy losses.