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A rasengan that incorporates a planet's chakra...
He's a chakra beast human.
He inherited the nature chakra affinity from Kurama.
A chakra beast is nature chakra with a will. This will gives it a purpose.
The previous tailed beasts purpose was to find Naruto.
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Through Naruto they became one.
Originally they were the ten tails, but the Sage of Six Paths separated its chakra into 9 different personalities.
These were the tailed beasts.
They lived as beasts and got to witness human life.
They evolved.
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By the time they found out Naruto was the child of prophecy they had witnessed the entire saga of shinobi on this planet.
When they entrusted Naruto with their chakra they were fulfilling their purpose.
They became one again within Naruto.
When Boruto was born they evolved again.
He was born with a nature chakra affinity.
This chakra is similar to the ten tails because it needs nutrients to grow.
As fate would have it Boruto is 80 something percent Otsutsuki.
He's a step ahead of everyone else.
Once he realizes this power he can reverse his karma and become a Sun God.
