Editing One Piece (section)

===Haki===
The most well-defined of the "super martial arts" in the series, '''Haki''' (strength aura) was the big revelation at the halfway point of canon, offering the most viable alternative to Devil Fruits as the "main" superpower of the setting. At its core, Haki is the standard shonen "willpower affects reality" affair, but there are three distinct Haki skills.

''Armament Haki'' is the offensive Haki branch; by concentrating their will, the user can reinforce their body to nullify damage, and increase their own striking power. It's particularly useful in that Armament Haki can penetrate Devil Fruit-granted resistances; a skilled user could punch a Logia (who can normally just turn into elemental matter to let the blow pass harmlessly through them) or the eater of the Gum-Gum Fruit (which turns the body into living rubber, making the user immune to blunt force), and as such it's the most commonly seen and used of the three Haki branches.

''Observation Haki'' strengthens the user's perceptive skills, in ways ranging from augmenting their ability to sense danger to full-blown combat-usable precognition.

''Conqueror's Haki'' is the rarest of the three Hakis, and is the only one that can't be taught - you're either born with it, or you're not. It's basically a telepathic assault, allowing the user to knock the weak-willed unconscious or send them fleeing in irresistible terror through the sheer presence of their emotions.