Haoshoku no Haki

Haoshoku no Haki is the rarest form of Haki, also being the strongest. When used, it will have a 2-3 second startup, but after that, it will immediately "knock out" any players near you who are also weaker than you for a few seconds. By default, anyone can gain it by just gaining Haki exp. However, the configs can be changed so that you have Haoshoku at the start if you're worthy. (You can check if you're worthy here.) This has no Doriki requirement.