The Devil Fruits only came into existence during One Piece's second world. This devil fruit was probably the first created.
In the Final Saga, fans found out a ton of information about how the Devil Fruits were created in the first place, and even a ...
Nico Robin not learning how to use Haki in One Piece is one of the most frustrating things but Eiichiro Oda explained it through Kaido's speech.