I actually think there was one possible example of when Zoro could have used Haki in the past...not saying that everyone has it but he may be one of the few eligible...
I actually think there was one possible example of when Zoro could have used Haki in the past...not saying that everyone has it but he may be one of the few eligible...
Kairoseki is supposed to be like unbreakable or something, so it would be perfect for a sword.