Busoshoku Haki is one of the three Haki main skills.
Busoshoku Haki allows the user to create a force similar to an invisible armor around themselves. Similar to Tekkai, this allows the user to defend against attacks that would otherwise cause them harm. Only significant physical force can overcome this defense; for example, Luffy striking Boa Marigold hard enough with Gear Second techniques to send her reeling.
This "invisible armor" can be used as a weapon to strike others with. It can be used to augment the user's own attacks, projected ahead of the user as pure brute force, or imbued in weapons to increase their effectiveness. Any attack enhanced by Busoshoku Haki hits immensely harder than it would normally be without it.
This type of Haki also has the ability to bypass the powers of a Devil Fruit user, touching the "substantial body" beneath whatever protection the fruit provides, such as the case of body-altering Devil Fruits such as Logia users. However, unlike seastone it does not negate a user's Devil Fruit powers, allowing them to defend themselves, and continue fighting normally.
Busoshoku Haki works independently of the user's Devil Fruit, as shown when Luffy uses it to enhance his Gear Third attack underwater. This type of Haki may not be equipped to attacks that are not from one's body except for weapons, or anything generated from one's own body (like Kizaru's laser beams, Marco's flames or any other energy/non-solid attacks based on Devil Fruits). So, those who attack with parts of their body can combine their Haki and Devil Fruit powers.
Allows the character to use their Willpower stat to grant increased power, enhanced defense, or to bypass a Devil Fruit users defenses. Protects against harmful effects from Devil Fruits such as the Ope Ope no Mi, can also protect against status effects caused by certain Devil Fruit abilities.
- Adds 1/4th Willpower to attacks and adds 1/4th Willpower to Defense.
- Armament Haki can be overridden if the opponent has stronger Haki, bypassing it's defense or neutralizing it entirely.