Path of true Cultivation

"Hahahahaha, finally I have succeeded." Aizen laughed loudly. Asa and Kaguya quickly come to his room and look at him questioningly.

Aizen smiles at Asa and Kaguya. He is really happy now. Finally, after 500 years of research Succeeded. For 500 years he has been researching regularly on this topic.

Before reincarnation, he has read a lot of information about this world. At that, it was just as a fan and also out of curiosity.

But who could have thought that he, one day will get the chance to reincarnate in this world?

So after coming to this world and spending so many years, he thought of all that information he read back then.

So out of curiosity, he started to research this matter.

"Nature Energy"

Nature energy is a form of energy that exists in the atmosphere and the earth. Natural energy circulates all throughout the world, but it is usually imperceptible.

Nature energy is the origin of Chakra.

The god tree absorbs Nature energy and Genetic information of a world and converts it into Chakra fruit.

The genetic information is used for the evolution of otsutsuki and the Chakra in the fruit is used as a fuel for Otsutsuki or energy.

Now here comes the question, if Nature energy is the Origin of Chakra then why do Shinobi or Otsutsuki Use Chakra instead of Nature energy?

Well everyone knows that it's not easy to perceive Nature energy. Even if you perceive it, becoming one with Nature isn't an easy fit.

So they go to the easy path which is a chakra. An easier version of Nature energy and easy to master.

And This is the Same for Otsutsuki too. But unlike Mortal, they have the god tree. Using this they can cultivate faster not only that this creature also helps with their main goal which is "Evolution", by collecting Genetic information of an entire world.

So after so many years Otsutsuki discarded Nature energy and started cultivating Chakra.

But a miracle happened, Hagoromo achieved to become one with the Nature with the help of the toad. Even though it's in the form of senjutsu and it blends with the already existing Chakra, it still gives a tremendous boost to one's power.

And because of this, they could defeat Kaguya in the first place.

Now Aizen could also learn the Senjutsu and could also get this boost in power. But he doesn't want that.

He knows that Toad, Snake or Slug, Even his 10 tails can absorb Nature energy directly. They don't use Chakra like humans. It's just their potential that stops them from advancing higher than their mortal realm.

So as greedy as he is, He also wants to Absorb Nature's energy directly. Without having trouble with it.

He could sense nature's energy for a long time now. But he couldn't absorb it directly until now.

He has been researching to create a way that will help him to achieve it. And they answer is for that is "cultivation technique".

But it's easier said than done. He who doesn't have a single knowledge of cultivation, how can he create a technique so easily. But if it wasn't his knowledge from his past life then he might have never had this idea.

So after that time he relentlessly start to research on this matter. Even though he doesn't know about Cultivation technique, he has read lots of cultivation novel. So he use them as a reference.

And the last piece of the puzzle was solved by Hagoromo's senjutsu.

Even then no one except him would be able to use this technique. It's because only he, the purest blood Otsutsuki and with the highest affinity with Nature could achieve this feat.

What he will do is completely different from this world's way of becoming strong.

Aizen looked at his mother and Kaguya and thought 'I will modify the senjutsu and teach them. It may not be like mine but it will be better than all the senjutsu here.'

Aizen smiled and said "mom, I will go out for some time. it may take a lot of time so don't worry. You and Kaguya stay here."

Asa nodded, she wanted to ask why he laughed but decided to ask after he completed what he wanted to do. They have one thing other mortals envy for, Time.

…

Aizen is in front of the Ryuchi cave of Slug. This place has the highest concentration of Nature energy in the Naruto world.

Maybe it's because it is monopolised by only one beast. But he doesn't care about the slug or whatever.

He goes inside the Cave. The first thing he saw is the slug. He knows that she already knows he is here. So Aizen disappears from there and arrives at the innermost place of the cave.

He saw a giant slug on the ground. It moves its eyes and looks toward him.

She stands still as she doesn't know what this 'human' wants. She asked Aizen "why are you here, Human?"

Aizen moves the transformation from his forehead and his third eye appears. The pitch-black Rinne-Sharingan.

The slug's eyes became wide when he saw the eyes. She now looks at Aizen carefully and seriously.

But the next second her body became a standstill. As if she isn't herself anymore.

Aizen looks at the Slug and closes his eyes. He just uses Tsukuyomi on her. He found this during his training.

Aizen then made a seal around the cave so that no one could disturb him. He then made a few more seals which will gather the Nature energy in one place.

After that Aizen made a bed and lay on it and sealed his 10 tails. He doesn't want it to absorb any energy now.

He then finally uses the technique he made after so many years.

"Origin Energy cultivation"

As soon as he used the technique he noticed that the energy in his body was depleting like a balloon. He didn't panic; he knows it was not depleting but transforming.

Aizen also lost consciousness and fell into hibernation.

…

"Run.. a monster has appeared." Someone shouted as he ran far from a Giant fox with Nine tails.

Even if he didn't shout, people would still run. All the villagers in Konoha abandon their homes and run towards the Hokage tower.

That is the only safest place they can think of now. They didn't care for any belongings, they just grabbed their child, wife or parents and ran towards the Hokage office.

Suddenly many Ninjas appear and help the civilians go to a safe place. They tried their best and used all their power to help the civilians.

But the Nine tails beast starts to start to kill and destroy everything in its path. Chaos spread through the whole village.

At one secluded place a man with yellow hair and red hair woman holding a newborn child in their arms and looking at their front.

In front of them is a woman with blueish white hair and a beautiful face. She has white eyes as she is looking at them or more accurately the baby.

She has a very complicated expression as she looks at the baby, sometimes it's love, sometimes it's sad, sometimes it's pain and sometimes it's anger.

Minato and Kushina don't know why she has so many expressions for their newborn child. But they are grateful to her.

If she wasn't here then their child might have…. they don't want to think about it.

"Thank you, mam. Thank you for saving our child." Kushina said again and again as she held her son in her arms tightly.

Minato looks at the woman and asks confusedly "who are you, mam? I have never seen you."

But before she could say anything, suddenly someone appeared beside her. The person punched their benefactor in the stomach. She falls to her knees and looks down.

Minato became worried and angry that someone hurt his benefactor. When he was about to say something he stopped. He finally recognised the person.

She is none other than Asa Hyuga.

"Lady Asa, what are you doing?" Minato asked seriously.

Asa turned around and said, "don't put your nose where it shouldn't belong?"

She then looks at the baby in Kushina's arms. 'So he is the boy Aizen talks about?'

She walked towards Kushina. Kushina's body was stiff but she didn't do anything. She didn't feel any threat from her.

Asa appears beside the yellow-haired boy who is sleeping without any care in the world. This baby reminds her of the time Aizen was born.

She looked at Kushina and said, "for him, I will let you two live."

Asa looked at Minato and said, "you, who put his faith blindly on someone, without knowing the person is plotting everything, are not suitable for a leader."

Asa grabs Kaguya by her neck and disappears from the place and a few seconds later the beast that is causing destruction in the village also vanishes.

A few moments later,

Asa looked at Kaguya seriously for a few minutes. Kaguya keeps looking down. She didn't say anything. She knows that she steps out of her boundaries.

Asa finally said "just because Aizen sometimes acts soft don't take it for granted. If you do anything that may disrupt his plan I will personally feed you to the ten tails."

Kaguya keeps looking down. Asa then sighed and said "I can understand your feeling. I am not like other Members of our clan. But still don't forget that you are still an Otsutsuki."

She pulls Kaguya up and looks at her. She is already crying. Asa pulls her into a hug and rubs her back.

Without knowing, the wheel of fate and destiny has shifted in an unknown direction.