Warlock Invasion of Naruto.

Everywhere you look, there are towering trees that are tens of meters tall.

The ground was muddy and slippery, and the entire forest was very damp and sweltering.

It is clearly not suitable for human habitation.

"Is this the Shikkotsu Forest?"

Bai Yu looked around at the scenery and thought to himself.

Even without activating his "sixth sense" to enhance his perception, he could still feel the extremely active energy particles in the space. These energy particles were what ninjas called "natural energy."

The Wood Spirit avatar stood beside Bai Yu, shrouded in a black robe and wearing a spiral-shaped wooden mask on its face.

Bai Yu spent four months helping Rope Tree grow legs, which were then successfully transplanted through surgery.

Before setting off with Kushina for the ruins of the Land of Whirlpools, Shiraha asked Tsunade if he could go to Shikkotsu Forest to learn Sage Mode.

Of course, he didn't learn it himself, but wanted the wood spirit to learn immortal arts.

It is said that the Senju clan had a contractual relationship with Shikkotsu Forest a long time ago, and the First Hokage learned Sage Mode from Shikkotsu Forest.

Therefore, the Wood Spirit incarnation, which has fused with a large number of first-generation cells, obviously has a high probability of being able to learn the immortal techniques of the Wet Bone Forest.

Most importantly, Tsunade said that the slug sage of Shikkotsu Forest was gentle and very easy to talk to.

Since the Senju clan signed a pact with Shikkotsu Forest, many people have gone there to cultivate immortal arts. Many have failed, but the mortality rate is less than 20%.

Bai Yu had only recently heard about these things from Tsunade.

If he had known this would happen, he might have wanted to become Tsunade's disciple even more back then.

However, given Bai Yu's ninja talent before advancing one level and his pitifully small amount of chakra, even if he came to Shikkotsu Forest and the Slug Sage taught him step by step, he probably still wouldn't be able to learn it.

"Are you Bai Yu?"

A tender voice rang out in the woods, a voice so gentle and melodious that it sounded like that of a young girl.

Bai Yu looked around.

In his perception, there were strong energy field fluctuations in every direction.

At this moment, a large number of white slugs, each the size of a palm, gradually appeared on the tall trees.

White slugs gradually emerged from the soft, slippery soil.

Slugs fell from the tree like raindrops to the ground, gathering together with the smaller slugs on the ground.

Soon, a giant slug the size of a small mountain appeared in front of Bai Yu.

"Are you the Slug Sage? I am Yagami Shiroha."

Bai Yu stepped forward and said respectfully.

"Lord Slug, my name is Wood Spirit." Wood Spirit's avatar also bowed.

"I am only a part of the main body. The main body stays underground. If it were to fully emerge, this forest would be destroyed." The slug-like childlike voice rang out again.

"I see." Bai Yu nodded, a hint of surprise flashing in his eyes.

Judging from size alone, the slug would be far superior to the White Snake Sage, and even the Great Toad Sage of Mount Myōboku would probably be no match for it.

So, the Slug Immortal is the strongest of the three immortals.

However, the energy particles here are too dense, and the energy field is too strong, so Bai Yu cannot sense the depths underground and does not know how big the slug is.

"Tsunade said you want to come and learn Sage Mode from Shikkotsu Forest. Are you already aware of the risks involved in practicing Sage Mode?"

"It's gentle," the slug said.

“Yes, but he learned it, not me,” Bai Yu said, pointing to the wood spirit avatar beside him.

Thanks to his military achievements and his connection with Tsunade, he has already accessed scrolls containing information on Wood Release ninjutsu.

After nearly a year of training, the strength of the Wood Spirit Incarnation is roughly between elite Jonin and Kage level.

This level of skill is insufficient to fully unleash the power of Wood Release.

However, if the Wood Spirit incarnation could learn the magic of the Wet Bone Forest, things might be different.

Having the Wood Spirit transform into an immortal being could also provide Bai Yu with a reference.

Even if the Wood Spirit avatar dies, Bai Yu can recreate it by consuming spiritual power and magic power, so the loss is not significant.

He wouldn't risk learning immortal techniques until the risks were reduced to a level that Bai Yu could bear.

The wood spirit avatar respectfully said, "Please guide me in learning immortal arts."

The slug's antennae twitched slightly, and it suddenly uttered a questioning sound: "You feel very familiar to me, like someone... That's right, it's Tsunade's grandfather, Hashirama Senju!"

Upon hearing this, Bai Yu felt a chill run down his spine.

This slug fairy's perception is just too outrageous!

“Since it was Tsunade’s request, I will teach you. However, I can only do my best to ensure your safety, not guarantee your success,” the slug continued, before explaining the methods and precautions for cultivating Sage Mode.

"Sage Techniques are a state in which natural energy can be used; they are also known as Sage Mode."

"The caster in this state..."

"The Immortal Mode in Shikko Forest focuses on enhancing vitality and accelerating cell division to improve recovery capabilities."

"..."

"Did you remember?"

The slug spoke slowly and patiently.

"Yes! I understand!" the Wood Spirit avatar replied respectfully.

Slug: "Let's begin."

"Yes!" The Wood Spirit avatar stepped forward.

"Ready?"

As it spoke, the slug spat out a pool of thick, milky-white liquid from its mouth.

The Wood Spirit's incarnation was completely enveloped within it.

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[Chapter 128. The Compatibility of Shikkotsu Forest Sage Mode and Wood Release Ninjutsu! (Two-in-One)]

"Forehead......"

Bai Yu was taken aback when he saw that the entire body of the Wood Spirit incarnation was covered in milky white liquid.

Soon, Bai Yu sensed the changes in the Wood Spirit's body through his connection with the Wood Spirit avatar.

The natural energy around the Wood Spirit avatar quickly became active and then continuously entered his body.

About ten minutes passed like this.

The Wood Spirit's avatar suddenly deflated like a punctured balloon, gradually shriveling up and becoming as soft as mud.

Bai Yu's eyes changed slightly, and the surrounding natural energy became violent and unstable.

It seems we've failed!

At this moment, tiny slugs the size of a palm kept falling from the giant slug's body, quickly covering the wood spirit's body completely.

Bai Yu sensed that the natural energy within the Wood Spirit's body, which had been out of control, was gradually shifting towards the little slug's body.

Once the slug had left, the Wood Spirit's body returned to its original state.

"To reach this level on your first attempt at cultivation, you're second only to Hashirama among all cultivators. Take a break before continuing," the slug's gentle voice rang out.

Wood Spirit Avatar: "Thank you."

Bai Yu fell into deep thought; cultivating immortal techniques was truly dangerous.

The natural energy of Shikkotsu Forest is not fundamentally different from that of Ryuchi Cave, but it is much gentler, which is probably the result of the slugs' deliberate control.

If this had happened in Dragon Cave, the Wood Spirit incarnation would probably have been killed.

Slugs are much more docile than snakes.

It seems it's prepared to act as a caretaker throughout, helping the Wood Spirit incarnate cultivate immortal arts.

After resting for a while, the Wood Spirit avatar continued its cultivation, while Bai Yu, having received permission from the Slug Immortal, toured the Wet Bone Forest.

This forest seemed to have no end. Bai Yu walked for a long time, and as far as the eye could see, there was still an endless forest.

He jumped to the top of a tree dozens of meters high, surrounded by tall trees on all sides; it was a sea of ​​trees.

"Could it be that the three sacred lands are not located in the ninja world?"

Bai Yu was puzzled.

This forest is so vast, and the plants here are several times larger than the usual plants in the ninja world. Moreover, the natural energy here is so abundant that it shouldn't be hard to find in the ninja world.

Ryuchi Cave is another example. The cave covers a vast area and is teeming with snakes. In the ninja world, many people would know about it.

"Could it be that the three holy lands are on another continent, or that this place is a special space relying on the ninja world?"

Considering the Grell Stone mine, there must be another continent outside the Ninja World. Therefore, Bai Yu believes that the Third Hokage's Holy Land may be located on another continent. However, it is more likely that the three Holy Lands are in an independent space, similar to a demiplane. They are independent but dependent on the Ninja World. If the Ninja World is destroyed, the demiplane will also be annihilated.

Unfortunately, Bai Yu has not yet learned spatial ninjutsu. As for spatial magic, there are a few in the "Book of Ancient Sorcerers," but even to construct the simplest spatial teleportation magic circle, one must at least reach level two.

Currently, Bai Yu is still in a period of rapid growth in strength, so there is no need to immediately search for the Grell Stone vein.

After all, searching aimlessly is a waste of time and inefficient, so he entrusted the task to Rank.

With Bai Yu's current bloodline purity, advancing to a level two sorcerer is not difficult at all. As long as his mental strength and physical constitution meet the requirements, he can basically advance.

However, one aspect takes more time: in the formal wizard (sorcerer) stage, mental strength can no longer simply increase as before.

The biggest difference between a formal wizard (sorcerer) and an apprentice lies in the strengthening and application of mental power.

For a wizard apprentice to advance to the next level, the key lies in creating a solidified mental power model. The wizard must choose a spell structure and construct a solid model of their will runes. After solidifying the model, the solidified model spell can be transformed into the wizard's innate ability, which is called innate spell.

However, this solid model is fragile and requires the wizard to constantly materialize mental energy and fill it into the model to strengthen it.

The essential difference between a wizard apprentice and a first-level wizard is that the former transforms the originally intangible spiritual power into a tangible form.

The materialization of spiritual power is divided into three stages: vaporization, liquefaction, and crystallization.