Haki/Haoshoku Haki

Haoshoku Haki is a rare form of Haki that cannot be attained through training. Only one in several million people have this ability. This type of Haki allows the user to exert their willpower over others.

It is said that whoever possesses this type of Haki has the qualities of a king.

Haoshoku Haki is considered an extremely dangerous threat and a highly valuable asset by powerful groups such as the Marine Admirals and the Yonko.

Background
It was first demonstrated by Shanks, when he used it to scare off a Sea King, though it was not fully explained and revealed. Later on, during a meeting with Whitebeard, he used it to knock out most of the crew, which the few still standing attributed to his superior Haki.

Luffy first displayed the effects of this type of Haki against Duval's bull, Motobaro, much to everyone's confusion. He displayed it again on Amazon Lily while battling Sandersonia and Marigold, knocking out a large portion of the audience observing the match. This is also the first time it is referred to by name. Luffy also used it to knock out the wolves attacking him and Bentham in Impel Down, although he was poisoned badly by Magellan at the time and still had no control over it. Luffy's exhibition of it during the Marineford War was enough for the Marine admirals to become wary enough of him that they prioritized his elimination afterwards.

After the timeskip, Luffy is proficient enough to tame monsters, as well as knock out a selected group of individuals without affecting any of the bystanders using Haoshoku Haki, displaying his new-found proficiency in the skill. Luffy was even able to use it while unconscious.

Usage
This type of Haki grants the user the ability to dominate the wills of others. The most common usage of it shown in the series so far is using it to exert the user's willpower onto those with weak wills and rendering them unconscious. Whilst inexperienced users are restricted to merely overpowering the will of one individual or blindly knocking out weak-willed people around them, those with more expertise can pick out weak-willed individuals in a large group and knock them out without affecting the others.

However, those with stronger wills can resist or even ignore the effects of Haoshoku Haki. The ability to knock someone out depends on the difference in strength between the person using the Haki and the person or persons the user is trying to knock out. The greater the power gap, the easier it is to knock the victim out.

According to Rayleigh, while this type of Haki cannot be attained through training, it can be improved upon through strengthening the will of the user. It seems that upon recovery, victims of Haoshoku Haki experience the sensation of chills running through their body. However, it presumably wears off after a short period. One can also use Haoshoku Haki to destroy things as seen by Shanks when he was able to crack a part of Whitebeard's ship using his Haki.

The ability can also be used even when unconscious, as shown when Luffy managed to knock down his captors in Wano despite being in an unresponsive state.

Strengths and Drawbacks
One of the main advantages of this form of Haki is that it can be used to knock weak-willed people out without physically harming them such as when Luffy used it to knock out the Fish-Men Island civilians who mistakenly believed he had kidnapped Princess Shirahoshi. It also allows the user to avoid having to fight with people weaker than themselves avoiding unnecessary conflict by ending a fight before it starts, such as when Luffy used it to knock out Demaro Black and the Fake Straw Hat Crew. As shown with Luffy's use of it on the New Fish-Man Pirates, this form of Haki can also be used to reduce an enemy's manpower.

However these advantages only apply to weak-willed people, as shown by Luffy's use during the Whitebeard War, while Luffy was able to knock out weak-willed Marines like Jango, the Marines with stronger wills like Fullbody were able to remain conscious.

Another advantage is a proficient user like Luffy can use it to tame powerful and dangerous animals, allowing the user to pacify ferocious beasts such as the Kraken or Fighting Bull while turning them into powerful allies.

Other Information
There have been two ways in which this Haki has been used. The first and most common way is in a quick burst that will knock out those with weaker wills relatively easily. The second method is to release it continuously, which will not only knock out those of weak wills around the user but also put pressure on the surroundings, actually affecting other physical objects besides living beings. It also has been shown that light bursts of Haoshoku Haki can be used in order to tame or intimidate creatures, and exhibit the users' superiority over the beast(s).



It has also been shown that when two users of this Haki clash, it causes a rippling or shock wave effect cracking the air similar to the Gura Gura no Mi. The shock waves from the Haoshoku Haki clash between Luffy and Chinjao were strong enough to blast people out of the coliseum arena into the water below. The Haoshoku Haki clash between Luffy and Doflamingo produced shockwaves that pushed Trebol and Law's incapacitated body away from them.

It is proof of one who has the qualities of a king!

According to Trebol, Haoshoku Haki is proof of an individual who possesses the qualities of a king, a candidate chosen by heaven. Indeed, most of the people who have been shown to possess Haoshoku Haki (aside from the non-canon Naguri) share a royal position or epithet or attained some highly respected status, which indicates their dominating role:
 * Boa Hancock, also known as the Pirate Empress, is Amazon Lily's ruler, a member of the Oka Shichibukai and captain of the Kuja Pirates.
 * Charlotte Linlin is Totto Land's queen, one of the Yonko, and captain of the Big Mom Pirates. She is also the matriarch of the Charlotte Family.
 * Charlotte Katakuri is one of the Sweet Commanders of the Big Mom Pirates (noted to be the strongest one), the minister of Komugi Island and the second son of the queen of Totto Land.
 * Chinjao was a Don before passing the title to Sai. He is the leader of the Chinjao family and former 12th Admiral of the Happo Navy.
 * Donquixote Doflamingo is the former king of Dressrosa, a former member of the Oka Shichibukai and captain of the Donquixote Pirates, as well as a former World Noble and the most influential person in the Underworld.
 * Edward Newgate was one of the Yonko and captain of the Whitebeard Pirates. He was the only man strong enough to rival the Pirate King Gol D. Roger and was also known as the one closest to the One Piece before his demise.
 * Eustass Kid is the captain of the Kid Pirates and an active participant in the Underworld. He is also part of the Worst Generation.
 * Kozuki Oden was the former Daimyo of Kuri and the son of Kozuki Sukiyaki, the Shogun of Wano Country.
 * Monkey D. Luffy is the captain of the Straw Hat Pirates and leader of the Straw Hat Grand Fleet, as well as the sworn brothers of Sabo and the late Portgas D. Ace, the grandson of Vice-Admiral Monkey D. Garp who has the epithet "Hero of the Marines", and the son of the Revolutionary Army leader, Monkey D. Dragon. Also, he has made notable friends with many royal people, such as Nefertari Vivi, Shirahoshi, and Rebecca, as well of having former royals of his crew and fleet, Sanji and Cavendish, respectively, and is the current possessor of the straw hat that once belonged to the late Pirate King, Gol D. Roger, which was later given to Shanks and later given to Luffy. He has also been recognized as the Fifth Emperor of the Sea. He is also part of the Worst Generation.
 * Portgas D. Ace, being the son of the Pirate King, can metaphorically be considered a prince, and was also mistakingly thought by the world at large to be the intended successor to Whitebeard himself. He was also captain of the Spade Pirates earlier, and later became commander of the second division of the Whitebeard Pirates.
 * Sengoku is a former Fleet Admiral, the highest ranking Marine Commissioned Officer. He possesses the power of the mystical Hito Hito no Mi, Model: Daibutsu, giving him the appearance of a giant representation of the Buddhism figure of highest enlightenment, which in turn earned him the epithet of "Sengoku the Buddha".
 * Shanks is one of the Yonko and captain of the Red Hair Pirates. He also served as an apprentice under the late Pirate King and inherited Roger's Straw Hat which he later gave to Luffy.
 * Silvers Rayleigh has the epithet of "Dark King". He was also the right-hand of the late Pirate King.

While this is shown to be a very rare gift among the world as a whole, it is noted by Don Chinjao that the New World is filled with numerous others who possess the ability to use this Haki. He explains that Luffy will most certainly encounter them and fight them for the title of Pirate King.

Anime and Manga Differences

 * In the manga, those hit with Haoshoku Haki foam at the mouth after or while losing consciousness, whereas in the anime, they simply faint.
 * In recent episodes, the use of Haoshoku Haki causes the affected area, excluding the user, to be highlighted in a dark blue tint. However, this could just be for dramatic effect. In the One Piece Film: Z, the Haoshoku Haki's use creates a circular purple wave. In the anime, the user of Haoshoku Haki has a dark purple aura around him. This can be seen only in Episode 723.

Translation and Dub Issues
Though the "Haō" in "Haōshoku" is translatable to "king", it refers to a "warring king" or "conqueror", one who rules by power and conquest. The term "Overlord" has been used by some translators.

Trivia

 * Sengoku is currently the only Marine capable of using Haoshoku Haki while all other users are Pirates.
 * Caesar Clown's attack Karakuni was mistaken for Haoshoku Haki by one of the Marines of G-5.
 * Haoshoku is currently the only type of Haki not confirmed to have an advanced application.
 * Kenbunshoku allowing one to see a short period into the future.
 * Busoshoku allowing one to emit the armament a short distance without a medium.
 * Haoshoku is currently the only type of Haki that is not known by an alternate name in a certain country.
 * Kenbunshoku is called Mantra in Skypiea.
 * Busoshoku is called Ryuo in Wano Country.

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