One Piece Gold - Rob Lucci's vivre card said that: The training required for the acquisition of rokushiki is akin to that used for acquiring haki. Akin = in the family Rokushiki
Por um escritor misterioso
Descrição
Rob Lucci Respect Thread
In One Piece, why do the members of CP9 learn to use the “six powers”, but not haki? - Quora
Chapter Discussion - Rokushiki is based on Haki, Page 5
Rob Lucci's Promise !!
Kaidou/History, One Piece Wiki
Chapter Discussion - Rokushiki is based on Haki, Page 6
Rokuogan, One Piece Wiki
Rokuogan, One Piece Wiki
One Piece 1068 brings back Lucci's Rokuogan
Chapter Discussion - Rokushiki is based on Haki, Page 5
In One Piece, why do the members of CP9 learn to use the “six powers”, but not haki? - Quora
Was Rob Lucci's Rokuogan an application of the advanced Haki that Luffy is learning now? - Quora
Chapter Discussion - Rokushiki is based on Haki, Page 6
Wano Country Arc, One Piece Wiki