Nico Robin has to get haki. Oda has set up the perfect scenario for her to finally tap into this power in One Piece.

Elbaf will be where some of the Straw Hats unlock haki. Oda sets the perfect opportunity for that in One Piece.

After going through all of the God's Knights appearances, I've figured out why none of them have used Haki so far, and One ...

One Piece's latest chapter just confirmed the Holy Knights may be even stronger than fans believed, revealing their true ...

This is where Haki comes in; Haki is the physical manifestation of a person's spiritual energy (will). Among all the attacks in One Piece, Haki is the most effective way of hurting a Devil Fruit user.

Ever since the very first chapter of One Piece, Devil Fruits and Haki were introduced as the primary power systems of the world, despite the latter only being fleshed out properly later on.