User blog comment:Voikus/Black swords/@comment-110.44.124.168-20200610221537

I think strong Haki isn't enough to convert sword into Kokuto. If its that easy Whitebeard, roger, shanks, and others would have it. I think to convert sword into Kotkuto is to master Breath of all things which allow swordsman to transfer their wills in the swords as you have used by Zoro against samurais in wano at a gambling house and also against Mr. 1 at alabasta.