Chapter Discussion - Rokushiki is based on Haki, Page 6

Right Lucci had to rely on mainly cutting/slash type attacks for effective purpose, while Luffy was putting a lot of stress on his body thanks to G2 at that time. If it's haki then his blunt

Chapter Discussion - Rokushiki is based on Haki, Page 8

one piece - What skills introduced prior to the formal introduction of Haki are Busoshoku Haki based? - Anime & Manga Stack Exchange

In One Piece, why do the members of CP9 learn to use the “six powers”, but not haki? - Quora

Hasshoken, One Piece Wiki

Completely unrelated but haki seems to give less/no resistance to awakened devil fruit abilities : r/OnePiece

One Piece: 8 Characters You Didn't Know Could Use Rokushiki

In Regards to Admirals and Conquerors Haki, and How It is a Circle : r/OnePiece

Haki and marine six powers : r/OnePiece

Oda might have hinted at a power system other than DFs early in the story. : r/OnePiece