The One Piece storyline has a lot of attention to detail which creates confusion and one of them is connected to Roronoa Zoro ...
He used it until Wano. Zoro returned Shusui to the grave of its master but was rewarded with Enma by Hiyori in exchange. Like Wado Ichimonji, Enma was crafted by legendary swordsmith Shimotsuki ...
These users have shown the most potential with it. Not only is he a master of Observation and Armament Haki, but, thanks to Enma, Zoro has now managed to tap into Conqueror’s Haki as well.