Naruto Bond

With the power given by the mysterious spring, Lu Fei and Naruto left the mysterious place and continued to explore deep into the forest. At this time, they felt that their own strength had been significantly improved compared to before, and their steps became more firm and powerful.

Not long after they walked, they felt the air around them freeze, and a sense of oppression came over them. Then, the bright sky was instantly covered by dark clouds, and darkness enveloped the entire forest, so dark that one could not see one's hand in front of one's face.

"This dark force seems to have noticed our actions and is trying to stop us from moving forward." Lu Fei gripped the Thunder Flame Sword tightly and said vigilantly.

Suddenly, black lightning struck from the dark clouds and hit them directly. Lu Fei quickly used the "Flame and Thunder Shield", and the flames on the sword intertwined with the power of lightning to form a huge semicircular shield that enveloped them. Naruto was not idle either, and used the Shadow Clone Technique to disperse the shadow clones around the shield to enhance the defense.

Black lightning continuously struck the shield, splashing sparks. Every impact caused the shield to tremble violently, as if it would break at any time.

"We can't go on like this, we have to take the initiative!" Naruto shouted.

Lu Fei nodded, put away his shield, and used the "Flame Lightning Slash" to slash at the source of the black lightning in the dark clouds. The sword energy cut through the darkness and collided with the black lightning, causing a strong energy fluctuation.

Naruto used "Senjutsu Wind Style Nine-tailed Rasenshuriken" and a huge Rasenshuriken flew towards the sky. The powerful force tore open a small piece of dark cloud, revealing a ray of light.

However, the power of darkness seemed endless, and more black lightning and black energy balls continued to emerge from the dark clouds and pour down towards them.

During the battle, Lu Fei discovered that during the flight of these black energy balls, there would be some weak energy threads connecting them to a core point in the dark clouds, which might be the control hub of the dark power.

"Naruto, attack the core points where those energy threads are connected, that's the key!" Lu Fei shouted loudly.

After hearing this, Naruto immediately ordered his shadow clones to change their attack direction and attack those core points. The real Naruto used "Senjutsu? Molten Release? Rasenshuriken", and the high-temperature Molten Release Rasenshuriken with blazing flames accurately hit a core point. After the core point was hit, the surrounding black energy balls instantly lost control and dissipated.

Lu Fei took the opportunity to perform "Flame Thunder Demon Slash", increased the power of the Thunder Sword to the extreme, and slashed at other core points with all his strength. Under their attack, the dark power in the dark clouds was gradually weakened, and the sky began to slowly become bright again.

But they knew that this was only a tentative attack by the dark forces and the real challenge was yet to come.

Continuing forward, they came to a huge dark castle. The castle exuded a strong dark atmosphere, and the walls were built of black boulders. Various evil runes were engraved on the walls. These runes flashed with strange light, as if telling the horrible secrets hidden in the castle.

The castle gate was tightly closed, and there were two huge dark puppets guarding the gate. The two puppets were tall, covered in black armor, holding huge black battle axes in their hands, their eyes flashing red light, revealing endless murderous intent.

"It seems that this is one of the lairs of the dark forces. We must be careful." Lu Fei said.

They approached the castle gate cautiously, and when they got close, the two dark puppets suddenly moved and swung their axes towards them. Lu Fei used "Flame Thunder Sky Slash" to block the attack of one puppet, while Naruto used Shadow Clone Technique to fight with the other puppet.

During the battle, Lu Fei discovered that the joints of these dark puppets were their weaknesses. Every time they attacked, the flow of dark energy at the joints would be briefly disrupted.

"Naruto, attack their joints!" Lu Fei shouted.

After hearing this, Naruto ordered his shadow clones to attack the puppets' joints. The real Naruto used the "Senjutsu Super Large Rasengan" and smashed it at the joint of a puppet. After the Rasengan hit the joint, the puppet's arm instantly lost control and the battle axe fell to the ground.

Lu Fei took the opportunity to perform the "Flame Thunder Demon Slash", increased the power of the sword to the extreme, and slashed at the joints of the other puppet with all his strength. Under their attack, the two dark puppets fell apart and turned into a pile of black fragments.

They pushed open the castle gate and walked into the castle. There was a foul smell inside, and all kinds of horrible paintings were hung on the walls. The creatures in the paintings were distorted and deformed, which made people shudder.

Walking along the corridor of the castle, they heard a painful groan coming from the front. They quickened their pace and came to a hall. In the center of the hall was a huge dark magic circle, which imprisoned many souls. These souls screamed miserably under the torture of dark magic.

"We must destroy this magic circle and save these souls!" Lu Fei said.

They began to study the structure of the magic circle and found that there were several key nodes in the magic circle. As long as these nodes were destroyed, the magic circle could be cracked.

Lu Fei and Naruto each used their strongest attacks to attack the nodes of the magic circle. After a fierce battle, they finally succeeded in destroying the magic circle. The imprisoned souls were liberated and turned into light spots that dissipated in the air, as if to express their gratitude to them.

But at this moment, the dark forces in the castle were completely enraged, and an even more powerful dark aura surged out from the depths of the castle and swept towards them.