Watanabe took a closer look when he heard this, and sure enough, he found that there was a strange energy in the air, wandering around his body, which he had never sensed outside the Wet Bone Forest before.

"What is natural energy?" Tsunade asked if he didn't understand.

Slug Immortal: "As the name suggests, natural energy is the energy produced by nature, which is different from the chakra refined by ninjas, natural energy exists anywhere in the ninja world, but due to the special geographical location, natural energy is particularly rich in the three holy places, and it is almost infelt. ”

Tsunade continued to ask, "Is the Wet Bone Forest one of the three sacred places?" ”

The Slug Immortal bowed his head and said, "Yes, in addition to the Wet Bone Forest where I live, Miaomu Mountain and Longdi Cave also contain very strong natural energy, which are the cultivation places of the Toad Immortal and the White Snake Immortal respectively. ”

"I see."

Watanabe and Tsunade thoughtfully learned the secrets of the ninja world from the slug immortals, and understood that there were other immortals in the ninja world.

"The chakra cultivated by your ninjas is formed by the fusion of the physical power and spiritual power of the human body itself, and as for the immortal arts, it is composed of the fusion of physical strength, spiritual power, and natural energy......

The Slug Immortal introduced the two of them and began to teach them how to cultivate immortal arts.

Under its guidance, Watanabe and Tsunade try to channel the natural energy that is free around them into their bodies.

To Watanabe's surprise, the process of channeling natural energy went smoothly, after all, the air was full of natural energy, and a large piece of it was inhaled.

After the natural energy was introduced into the body, Watanabe immediately forced to merge with the physical power and spiritual power, and as soon as the front feet of the three energies touched, a line of light popped out of Watanabe's eyes on the back feet.

[Fusion of Natural Energy: Slug -87, Repulsion -95, Fusion Speed +92......]

A cloud of immortal chakra smelted from three energies was born.

"Is it that simple?"

Watanabe only felt that refining the Immortal Chakra was easier than refining the ordinary Chakra, and continued to refine more Immortal Chakra.

During the two of them cultivating immortal arts, the mouth of the slug immortal was never idle, and they kept sharing their experiences with the two:

"The three energies are inherently repulsive, so the whole fusion process is very difficult, it all depends on the individual's talent and aptitude, when I first started to cultivate immortal arts, it took me ten years to fuse the immortal chakra......"

"Ten years?"

Tsunade's eyelids twitched.

She already felt the difficulty at this time, if it was just a fusion of physical strength and spiritual power, she could easily do it, after all, she usually refined chakra like this, but now she had to fuse one more piece of natural energy, and the difficulty suddenly skyrocketed.

The three parts of energy are like magnets at the same pole, and each time they get a little closer, they will immediately repel and collapse, and Tsunade has tried more than a dozen times in a row to end in failure.

"In addition to the difficulty of fusion, the most important thing to note is that the natural energy must not be inhaled too much, otherwise the whole body will be transformed into a slug......"

"Slug Immortal, how long did it take my grandfather to master the immortal arts?" Tsunade couldn't help but interrupt.

The Slug Immortal replied, "It only took ten days for the Thousand Hand Pillars to successfully fuse the Immortal Chakra and enter the Immortal Mode. ”

It knew that Tsunade regarded his grandfather as a target to chase, and comforted: "The Thousand Hands Pillar has special qualifications, and it is a natural immortal body, so the immortal arts are mastered very quickly, you two husbands and wives are different, without the immortal body between the Thousand Hands Pillars, it is very ...... to be able to master the immortal arts within ten years."

"Boom!"

Before the slug immortal's words fell, a wave of qi exploded beside him.

At the same time as Tsunade, he followed the prestige, and saw that the wave of qi was bursting out of Watanabe's body, and a circle of pitch-black eyeshadow appeared around Watanabe's eye sockets, and a large number of fairy chakras were billowing out, lifting his clothes and hair into the air.

Rows of light curtains popped up one after another that only Watanabe could see.

[Fusion of Natural Energy: Slug -89, Repulsion -97, Fusion Speed +94......]

[Fusion of Natural Energy: Slug -91, Repulsion -99, Fusion Speed +96......]

"Him! He's in immortal mode?! ”

The slug immortal was stunned, his eyes were round in disbelief, Rao was that it had lived for a thousand years, and at this time it also felt extremely shocked.

The Slug Immortal knew that the reason why the Thousand Hands Pillar was able to master the immortal art within ten days was because he was the reincarnation of an asura, and with the innate immortal body, it was understandable that the cultivation of the immortal art was progressing faster.

But why was Watanabe able to enter immortal mode so quickly?

Not to mention ten days, does he have ten minutes to cultivate immortal arts? ?

The slug immortal did not sense the aura of Asura or Indra from Watanabe's body, and was sure that he was not the reincarnation of the descendants of the Six Realms Immortals, and for a while he was puzzled and couldn't figure out what the problem was.

"Immortal Chakra is really powerful!"

Watanabe clenched his fists, feeling the boiling and surging power of immortal magic in his body, and said happily.

He had been fusing the Immortal Chakra the whole time just now, concentrating, and he hadn't heard the conversation between Tsunade and the Slug Immortal, nor had he noticed the shock on the faces of the two of them at the moment.

"Watanabe, have you fused the fairy chakra?"

Tsunade was shocked and didn't confirm it with him.

"Yes, I didn't expect the Immortal Chakra to be fused so easily, I have now transformed all the Chakra in my body into Immortal Chakra!"

“……”

Tsunade was stunned, and looked at the slug immortal who was also confused, his ruddy lips opened slightly, as if he wanted to ask something.

"Howe Fireball Technique."

At this time, in order to test the power of the senjutsu chakra, Watanabe cast a fire escape with a seal of his hands, only to see a raging sea of fire erupt from his mouth and roll towards the passage on the left side of the cave.

The Immortal Chakra not only increased the volume of the fireball, but also increased the temperature of the flames, and the rock and soil on both sides of the cave were melted into glass crystals by the high temperature.

"Immortal Chakra is much stronger than ordinary Chakra, it can be called a qualitative change, and the power of ninjutsu and body art has been increased dozens of times!"

Under the immortal mode, Watanabe only felt that whether it was ninjutsu or physical arts, the power had been greatly improved, and it seemed that he had too much strength to use up.

If he is allowed to fight with the three generations of Mizukage again, Watanabe is confident that the other party will no longer be immune to his attacks, and he can perfectly restrain the hydration technique of the three generations of Mizukage with the immortal chakra, and he doesn't even need to open the Eight Gates Dunjia, just using the immortal technique is enough to easily kill him.

"Thank you Slug Immortal for teaching the fairy arts, I am grateful!"

Watanabe solemnly saluted the slug immortals, and this time he got a hole card comparable to the eight Dunjia in the wet bone forest.

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