I really don’t want to answer the question of chakra, but some people still bring it up because they have no choice. The answer is actually already given in the comics.

Kakashi died due to exhaustion of chakra during the battle with Pain.

As for the origin of chakra, Madara himself said that the origin of chakra is the sacred tree. The sacred tree was brought to the earth by Kaguya Otsutsuki from other places and is not an original thing of the earth.

The official setting also states that Kaguya Otsutsuki is the first person on earth to possess, remember, the first person to possess chakra.

In other words, before Kaguya Otsutsuki, there was no such thing as chakra on the earth. It also proved that ancient humans would not die without chakra.

But in the original period, Kakashi will die due to exhaustion of chakra, emmmm...

Why chakra has become the necessary energy for life on earth to maintain life is probably due to some unknown changes.

AB did not give any explanation or explanation for these unknown events, and could only rely on personal speculation.

My personal preference is that the earth experienced some major changes many years ago due to the planting of sacred trees.

I don’t know if there is a new explanation of chakra in Boruto, because I have only watched a few episodes of Boruto and haven’t studied it deeply. I don’t want to get into Otsutsuki’s alien setting either.

As for the darkness that monsters collect from people's hearts, it is more reasonable to use chakra here.

Chakra has the function of 'transmitting information'. The Sage of Six Paths also said that when he first spread the ninja sect, he hoped that human beings could communicate with each other spiritually under the guidance of chakra and build a bridge for everyone to understand each other.

It can be seen that chakra has a special channel for communication between soul and soul.

The monster absorbs the darkness in people's hearts, and must rely on "channels" to contact the human heart. Otherwise, it cannot be explained that the monster absorbs the darkness in people's hearts, and the monster will be truly invincible.

Therefore, it is set here to absorb the dark part of people's hearts through the channel of chakra.

Once the connection between itself and chakra is cut off, the demon will lose the 'bridge' to the depths of the human heart, and the darkness it controls will be useless.

For others, losing chakra means death, but for Shiraishi, it is just relying on another kind of energy to maintain life. This is the evil hand of the devil.

The basic structure is all given by the official. I only provide supplementary explanations in this book. The monster part of the second creation may be a bit unreasonable. However, the origin of chakra comes from the sacred tree and ancient humans do not have chakra.

, are all the original things in the official comics and settings. If these are rejected, it can only mean that the settings before and after Naruto have once again caused conflicts... Why should I say it again...

Everyone who understands understands.

Anyway, I don’t believe that the Third Hokage is the strongest Hokage.
Chapter completed!