Katsuyu, the summoning of Tsunade, does it make her nearly invincible?
- Katsuyu is able to spit acid which has been shown to be far more powerful than the acid of Mei, I think it is safe to assume that one hit from that would be a major setback to anyone
- She is able to split itself to survive attacks
- She is able to heal
- She isnt exactly slow
She was ablr to heal most of the villagers in the invasion of Pain. She was able to survive the big ass Shinra Tensei and more than that she was able to protect most of the villagers from it. Only a small clone was able to survive the destructive chakra from the 9 tails (the one Naruto had for intel).
As Katsuyus power is also Tsunades power that means it takes an extremely powerful attack to defeat Tsunade (like Chibaku Tensei, perhaps Rasenshuriken, FTG, Madaras Space Time, TBB, Itachis Susanoo with the sword, extremely powerful Fuinjutsu) with other words a technique more powerful than that big ass Shinra Tensei
I made this so that people who underestimate Tsunade see that she is a force to be reckoned with and of course she still has her own techs and abilities.