

**_Note!! There will be Heavy spoilers._**

Since the introduction of Haki (after the 2 year time skip), the colour of
arms Haki has been the main way of hitting and damaging most defenses from
devil fruits (Paramecia and logia type). But in Kaido's case, hitting him with
Haki (even when he isn't using Haki) does no damage to him.

[![enter image description
here](https://i.stack.imgur.com/1PD6K.jpg)](https://i.stack.imgur.com/1PD6K.jpg)

**How is it possible that even the[Color of Arms Aka
Busoshoku](http://onepiece.wikia.com/wiki/Haki/Busoshoku_Haki) Haki didn't
seem to phase him at all.** Is this related to the [Tekkai
technique](http://onepiece.wikia.com/wiki/Rokushiki/Tekkai) used by the Cp-9?
(We know the world government captured him at some point). Or is this ability
an effect of Kaidos "serpentine dragon" devil fruit.

Also is it similar to Big Moms "invincibility"? Because I also remember Bege
talking about how Big Mom had never been wounded till the time she cried from
Mother Carmel's portrait.


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one-piece
What is the deal with some Emperors


The chapter is too recent, so we don't have concrete answers. Initially, it
was theorized that the Yonko would be so well versed with Armament Haki that
they would always passively have their bodies protected by it. However, Oda
has always clearly denoted the usage of Armament Haki through that deep black
color, and this makes it apparent that neither of them are constantly using
Haki. This is also taking into consideration the fact that there are levels of
strength within the Armament Haki, and we know for certain that Big Mom is
stronger than Luffy in that aspect during their clash.

Despite the similarities, the most likely reason is still that both of them
have their own unique circumstances rather than a common reason. Kaido has
long been hyped to be this strong, and there are tons of theories as to the
source of his strength - ranging from experimentation, to his real body being
a dragon. While there is less information to work with on Big Mom, we will
never have a clear answer till Oda himself gives it.

For a more detailed analysis, you can check out this [Joy Boy theory
video](https://www.youtube.com/watch?v=g92ryIJNBHU) that shows instances to
indicate why it isn't the next tier of Armament Haki. He believes it could be
the unrevealed power of the Conqueror's Haki, but keep in mind that it's
theory and not canon.


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In the One Piece world, people can have pretty different biologies, some
having special traits that are rather overpowered. A good example of how this
is "genetical" is the Funk brothers; Kelly was beaten by one punch from Boo,
but when Boo used an axe **infused with Armament Haki** against Bobby it
**BROKE against his BACK!!** Bobby is said to have never actually fought in
his life, and I doubt that he would just _happen to be_ skilled at Haki. Kelly
specifically mentions that Bobby was _born with_ such a strong body.

Big Mom is the same, ever since childhood she has been practically
invulnerable. This might actually be a sort of subconsious Haki, but it's more
likely that it's just the way her body is.

And before anyone tells me "bodies don't work that way, getting stabbed by a
sword without haki protecting you will always hurt you", this is One Piece. If
Luffy could send a 20+ meter long jaguar flying with a punch (Amazon Lily,
before he learned any haki) then can you really claim that it's impossible?
**Why would super-strength be common, and super-durability impossible?**


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