Nico Robin haki kick color by xMrNothingx on DeviantArt

Geppo, One Piece Wiki

The Rokushiki Techniques Explained

Rokushiki, Wiki

What power is it? : r/OnePiece

Was Rob Lucci's Rokuogan an application of the advanced Haki that Luffy is learning now? - Quora

One Piece: Strongest Abilities That Are Not Devil Fruit Or Haki

Rob Lucci's initial Vivre Card has been changed from Learned Haki to strengthened Haki related to Rokushiki : r/OnePiece

Artur - Library of Ohara on X: Official Vivre Card Correction: Lucci's vivre card said that he learned haki during the timeskip. However, this correction states he simply strengthened his haki over

Chapter Discussion - Rokushiki is based on Haki, Page 3

Chapter Discussion - Rokushiki is based on Haki, Page 7