Throughout the Naruto series, Naruto Uzumaki is reliant on Kurama's power ... power of the natural form of the world along with enhancing his own techniques and gaining new ones.

Baryon Mode uses Naruto's and Kurama's chakra as raw materials to make an entirely new form of energy. Using this mode made ...

This was until Kurama suggested he use a new form that would act as a final gamble for the two of them. This was a powerful new form that the cliffhanger teases will even the odds. https ...

Kurama, the Nine Tailed Beast ... Since they are a life form made out of chakra, they are capable of reincarnating after a few years. This is how the Tailed Beasts were introduced in the series.

This is exactly what happened to Kurama in the anime, and it is because of Baryon Mode. The surprising form gave Naruto the power to fight toe-to-toe with Isshiki, but it came at a cost.