Naruto upgrades......

[Abbadon616]

Since kaguya was going to blow up her dimension which is likely a planet since we can see a sun, and tank the attack, then naruto who cut her arm off should be upgraded to 5B

Before anyone gets mad this is literally the same logic used to upgrade ichigo to 5B so.....

 

[Steel_Justice]

Durability: At least Moon level+, likely Small Planet level (But her durability was portrayed very inconsistently. However, immortality and Regenerationn makes her hard to kill)

 

[Abbadon616]

Why small planet level though ? We never got a size for her dimension but I'm assuming that it's a planet due to the fact that we can see the sun right there in the background meaning it's either a planet orbiting a sun or she can create a mini sun in her dimension....

 

[PaChi2]

This has been discussed so many times we have a rule against upgrading kaguya.

She is planet level with the technique that would have destroyed NarutoWorld.