The Ōtsutsuki Clan.
They had a normal lifespan of thousands of years and could reincarnate through Karma, making them beings who had seemingly transcended death in the Naruto World.
And they had only one goal: to plant trees.
More specifically, they used the Ten-Tails to devour a planet's life, repeating the process until they became gods. Upon arriving at a planet, they planted a God Tree in the ground. It was an enormous tree whose roots burrowed deep into every part of the planet, draining all energy from every living thing until every last life form perished.
Once the God Tree matured, it bore fruit containing terrifying energy and a vast wealth of genetic information. Eating the fruit allowed members of the Ōtsutsuki Clan to evolve, a process said to have no end.
In addition, for a Ten-Tails to become a God Tree, one special condition had to be met: it had to eat a living Ōtsutsuki.
For this reason, when attacking a target planet, the Ōtsutsuki Clan sent out squads of two. One was eaten to give birth to the God Tree, while the other watched over its growth until it bore a Chakra Fruit.
Normally, the Ōtsutsuki assigned as the living sacrifice would use Karma to prepare a vessel for themself beforehand, ensuring a smooth resurrection.
But accidents always happened!
A thousand years ago, Kaguya and Isshiki came to Earth in the Naruto World to plant a God Tree. Kaguya had been chosen as the sacrifice, but at some point she betrayed Isshiki and launched a sneak attack that left him gravely injured, escaping her terrible fate.
Afterward, the Rabbit Goddess watched over the God Tree alone and ate its Chakra Fruit, gaining immense power. She pacified the warring Shinobi World and became humanity's supreme ruler.
Kaguya then