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

Does Rob Lucci Have Conqueror's Haki? An Analysis : r/OnePiece

Rokushiki is based on physical strength is actually based on a

Silvers Rayleigh, One Piece Wiki

One Piece 1068 brings back Lucci's Rokuogan

What does Law mean when he said Luffy uses too much Haki in Gear 4

What is the strength of Lucci in One Piece? - Quora

Powers & Abilities - Rob Lucci had Haki Pre-Timeskip

How does Rob Lucci compare to other One Piece characters? - Quora

When saving O-Tama, Luffy could have activated second gear to out

Already in the next chapter : r/Piratefolk

The official translation of Busou Byogou [SPOILERS!] : r/OnePiece