Chaotic battlefield.
High in the sky, Sage of Six Paths and the three Sage Land sages engaged in a fierce battle.
Down below, Uchiha Clan and the Underworld locked in confrontation.
Otsutsuki Hagoromo lay dormant for a thousand years, accumulating a massive number of ninjas in the Underworld. These ninjas formed the foundation of his power.
Naruto World was originally a world with infinite potential, but once fellows from the Ōtsutsuki Clan entered, the world's development was essentially cut off at the waist.
Kaguya Otsutsuki's Divine Tree, the nine tailed beasts split apart by Otsutsuki Hagoromo, Otsutsuki Hagoromo's Underworld...
All these things absorbed a massive amount of the ninja world's natural energy, and the most crucial part was that it was all input and no output.
Their existence was like several leaking holes at the bottom of a pool, making the water inside the pool less and less.
A normal world did not fear the emergence of powerhouses within it, because no matter how strong those powerhouses became through cultivation, they still formed a positive cycle with the world.
Powerful immortals and gods inherently constituted the world's cycle.
For example: Investiture of the Gods World. The saints within it possessed powerful strength and consumed a massive amount of spiritual qi, but at the same time they transformed themselves into the rules of the world, becoming the pillars of the world and making the world even more powerful.
On the other hand, people from the Ōtsutsuki Clan did not count as a part of the world's operating system. Just as the human body has a heart, liver, spleen, lungs, and kidneys, with each organ playing its specific role, the Ōtsutsuki Clan were parasites living off the human body.
As time passed, the power of the tailed beasts grew stronger and stronger.