> This is Zoro's KOH character design sheet from anime, and they marked each one of his KoH's traits :
•
Top left corner: "Zoro Haki Release" (ゾロ覇気放出)
•Text near the swords: "Fire" (火) with arrows pointing to the green flames around the swords.
•Top right: "Attack of the color of supreme king" (覇王色のバリツ) - "Haoshoku no Baritsu," which refers to Zoro using an advanced form of Haki, specifically "Haoshoku Haki" (Conqueror's Haki).
•Bottom center: 武装硬化状態から (From Armament Hardening State)
•Bottom left : (next to the smoke):煙・冷気・質感 "Smoke/Steam Effect"
•Bottom text: "Blackened" (黒くなった剣), referring to the swords being imbued with Haki and turning black.
The character in the image is using a powerful technique that involves Conqueror’s haki shown visually with the green flames around his swords.
> Thanks to anime , we get to know better about Zoro's Power up whilst some clowns claimed he used KoH against Zoro .
@Copebeer