Rokushiki Robin 32-1 by Shinjojin on DeviantArt

Rokushiki, Wiki

World of Shinjoin! — The Nico Robin: Rokushiki style Project! (part2)

Illustration - Rokushiki Robin artwork

Nico Robin Hana Rokushiki Combo by Fighter1Manga on DeviantArt

One Piece 1068 brings back Lucci's Rokuogan

Rokushiki Robin 14 by Shinjojin on DeviantArt

Rokushiki/Shigan, One Piece Wiki

Honestly Oda probably should have just expanded on Rokushiki instead of creating Haki. He could have definitely made it to where there are techniques that allow you to hit logias and armament

Shigan, Wiki

AD) THE ROKUSHIKI + HANA HANA NO MI CHALLENGE by OnePiece-Fan-Club on DeviantArt