Haki is a dormant ability present in every living being, which can be awakened using intense and hard training. Haki is a spiritual force that can increase one's physical strength too. Haki is a must use skill to sail in New World which is turf of four Yonkou ( Emperors) , it can be compared to Chakra in naruto or ki in DBZ but unlike these two Haki is not a skill that all characters possess in One Piece.
In One Piece it is very rare for character to be able to use haki. Arnament haki is known as the only common offensive technique which can hurt Logia type users but little do we know there are also some alternatives which can hurt Logia type Devil fruit user's body. Let's talk about them,
Fishman Karate
Very few One Piece fans know that like Haki, fishman karate users can touch flowing bodies of logia users, which makes fishman karate a formidable martial art in One Piece, Fishman karate is used by residents of Fishman Island, Jimbei "the sea knight" is the most powerful user of fishman karate and he was shown fighting fire fist ace in series for 5 days, he is also recently shown fighting Katakuri who is a logia type user in Big Mom's tea party. This might also be the reason why most of the Revolutionaries in Revolutionary Army
In One Piece it is very rare for character to be able to use haki. Arnament haki is known as the only common offensive technique which can hurt Logia type users but little do we know there are also some alternatives which can hurt Logia type Devil fruit user's body. Let's talk about them,
Fishman Karate
Very few One Piece fans know that like Haki, fishman karate users can touch flowing bodies of logia users, which makes fishman karate a formidable martial art in One Piece, Fishman karate is used by residents of Fishman Island, Jimbei "the sea knight" is the most powerful user of fishman karate and he was shown fighting fire fist ace in series for 5 days, he is also recently shown fighting Katakuri who is a logia type user in Big Mom's tea party. This might also be the reason why most of the Revolutionaries in Revolutionary Army