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People are focusing too much on haki but forget that haki legends like Roger, Whitebeard and Rayleigh failed to have a black blade.
So far Wano's evidences point much more to killing/blood related in order to obtain a black blade.
That fox told that Ryuuma turned Shusui a black blade after many battles and blood dropped by that sword. That old guy in Zoro's village told him that swords are meant to kill. Mihawk used to fight swordsmen before being WSS and used to hunt pirates for hobby.
That's why ZKK is a big indicator of Enma turning into black blade. And ZKS may be Wado's turn to be black blade.
So far Wano's evidences point much more to killing/blood related in order to obtain a black blade.
That fox told that Ryuuma turned Shusui a black blade after many battles and blood dropped by that sword. That old guy in Zoro's village told him that swords are meant to kill. Mihawk used to fight swordsmen before being WSS and used to hunt pirates for hobby.
That's why ZKK is a big indicator of Enma turning into black blade. And ZKS may be Wado's turn to be black blade.