Rokushiki/Tekkai

We've trained our bodies such that we can turn them into "iron carapaces" if we so choose...

Tekkai is one of the six techniques of "Rokushiki" that allows superhuman defense.

Overview
The Tekkai hardens the users' muscles to the level of iron, in order to nullify damage taken from attacks. However, it can be broken by strong enough forces such as Luffy's various Gears, Zoro's Shishi Sonson and Tatsumaki, Sanji's Diable Jambe, Franky's Strong Hammer, and Chopper's Monster Point.

When Tekkai is active, the user is unable to move, with the exception of Jabra's Tekkai Kenpo. Tekkai can also be used to enhance the user's attacks by the increased density one gets from using Tekkai. Aside from Jabra, it requires the user to utilize Tekkai after they are mobile towards the opponent.

The strength of Tekkai can vary for users with different physical conditions, as a person with a higher level of muscular strength would be able to take stronger forces and enhance attacks with their use of Tekkai. Furthermore, despite the increased physical density that one gains when activating this move, the user's body is still flesh and blood. Thus, its resistance to force has its limits. Furthermore, Tekkai cannot harden the body against non-physical attacks, making the user as vulnerable as ever to certain attacks. As such, even masters of Tekkai are far from indestructible; the limit of one's Tekkai to resist damage does, however, improve with mastery.{{Qref|chap=422|page=4|ep=305}13-year-old Lucci withstood cannonballs.}}

Variations

 * Tekkai "Utsugi" (鉄塊「空木」): Used by Lucci in his Human-Beast Form. This form of Tekkai is used entirely as a counter instead, where the purpose is not to absorb damage from the attack, but to transfer the shock of the attack back to the attacker, which can lead to broken bones in a normal human body. In the FUNimation dub and Viz Manga, this is called Iron Body Empty Tree. The kanji for the deutzia literally means "Air/Sky Tree", hence the translation choice.
 * Tekkai "Mushikaku" (鉄塊「無死角」): Used by Kaku in his Human-Beast Form. Kaku bends his neck and legs to shift himself into a cube. When Tekkai is used in this form, he eliminates the weak points of his body, particularly his neck, and ensures that not a single spot is vulnerable to his following Kiri Shigure, though he looks ridiculous to his opponents. The pun is that "mashikaku", means "perfect square", and again is a play on Kaku's name. In the FUNimation dub and Viz Manga, this is called Iron Body Edgewise.
 * Tekkai Kenpo (鉄塊拳法): Used by Jabra in his Human-Beast Form. Using Tekkai Kenpo, Jabra is able to move while using Tekkai. Tekkai Kenpo is also an entire fighting style, with various techniques of its own. In the Viz Manga, this is called Iron Body Kung Fu, and in the FUNimation dub, it is called Iron Body Kenpo. Kenpou is a popular term for basic self-defense Chinese martial arts.
 * Tekkai Kenpo "Okami Hajiki" (鉄塊拳法「狼弾」): After hardening his hands with Tekkai, Jabra punches his opponent. In the Viz Manga, this is called Iron Body Kung Fu Wolf Bullet. In the FUNimation dub, this is called Iron Body Kenpo Wolf Repel.
 * Tekkai Kenpo "Roga no Kamae" (鉄塊拳法「狼牙の構え」): Simply called Rōga for short. Rōga is one of Jabra's forms of Tekkai Kenpō, where he attacks his opponent using his claws. The way that Rōga is called is a pun in Japanese; oftentimes sentences end with darō, approximately meaning "probably". Sometimes, however, the particle ga would be added onto the end of a sentence to make it seem more direct. This is the way Jabra normally speaks, so he simply replaces where he would normally say darō ga (だろうが) with da rōga (だ狼牙). In the Viz Manga, this is called Iron Body Kung Fu Wolf Fang Stance. In the FUNimation dub, this is called Iron Body Kenpo Wolf Fang Stance.
 * Tekkai Kenpo "Roba no Kamae" (鉄塊拳法「狼芭の構え」): A form of Tekkai Kenpō, in which Jabra seems to combine Tekkai with Soru in order to move at extreme speeds. In the Viz Manga, this is called Iron Body Kung Fu Wolf Plantain Stance. In the FUNimation dub, this is called Iron Body Kenpo Wolf Plantain Stance. The kanji is a possible pun on the term rouba (老婆, lit. old woman).
 * Rokaru Area Network (狼狩エリア・ネットワーク): While moving at high speed, Jabra slashes at his opponent with both hands. Because of his high speed, it appears as if he was attacking with multiple hands. Rokaru is the Japanese way of pronouncing the word "local", making this attack a pun on "local area network". In the Viz Manga and FUNimation dub, this is called Wolf Hunt Highspeed Scratch.
 * Tekkai Kenpo "Don Poro" (鉄塊拳法「重歩狼」): A punch to the opponent's stomach with Tekkai in use. Dongpo Rou can also mean simmered square pork meat in Chinese. In the Viz Manga, this is called Iron Body Kung Fu Don Po Ro. In the FUNimation dub, this is called Heavy Wolf Paw.
 * Tekkai Kenpo "Matenro" (鉄塊拳法「魔天狼」): Jabra flips onto his hands, then kicks his opponent up into the air. In the anime, this attack was portrayed as a jumping kick instead. Matenrou is also Japanese for "skyscraper", while tenrou (lit. heavenly wolf) is a term for the Sirius wolf. In the Viz Manga, this is called Iron Body Kung Fu Devil Wolf. In the FUNimation dub, this is called  Iron Body Kenpo Devil Wolf.
 * Soru "Tekkai Dama" (剃「鉄塊玉」): Used by Fukurou. In this attack, Fukurou spins his body at great speeds towards his opponent using Soru, then uses Tekkai to harden his spherical body. In the Viz Manga, this is called Shave Iron Ball.
 * Cho Sokuten Tekkai Dama (超側転 鉄塊玉): A variation on the above technique used by Fukurou wherein he combines his usual Tekkai Dama movements with Geppo to use it in midair. In the FUNimation Dub and Viz Manga, this is called Super Cartwheel Iron Ball.
 * Tekkai "Rin" (鉄塊「輪」): Used by Blueno. Blueno uses Tekkai and kicks one leg into the ground and starts rotating his legs at a fast speed, causing his legs to simultaneously slam into the ground on a set path toward his opponent. It also seems to incorporate Rankyaku, as the legs leave blue traces in the air like a normal Rankyaku shockwave and a glancing attack cut a small amount of Luffy's hair. In the Viz Manga and FUNimation dub, this is called Iron Body Wheel.
 * Tekkai "Sai" (鉄塊「砕」): Used by Blueno and Kibin. After using Geppo to project himself above his opponent, Blueno uses Tekkai to harden his fist, smashing the enemy. In the Viz Manga, this is called Iron Body Smash. In the FUNimation dub, this is called Iron Body Strong when used by Blueno and Iron Body Smash when used by Kibin.
 * Tekkai "Go" (鉄塊「剛」): Used by Blueno and Kumadori. Visually, the move differs from the ordinary Tekkai in that the user visually tenses his body even further while standing still; the ordinary Tekkai could be activated seamlessly. According to Blueno, it is his strongest form of Tekkai. In the Viz Manga, this is called Iron Body Strength when used by Blueno, and Solid Iron Body when used by Kumadori, and in the FUNimation dub, it is called Iron Body Strength in both instances.




 * Tekkai "Kibasen" (鉄塊「牙閃」): Used by Who's-Who in his Human-Beast Form. While his body is in a state of Tekkai, Who's-Who crouches into a pouncing position, hardens his teeth and then leaps towards the target face-first, attempting to tear them with his fangs. It was first used against Jinbe. While the attack was able to push Jinbe a reasonable distance, the Fish-Man was able to ultimately block and counter it with his Busoshoku Haki and Fish-Man Jujutsu. In the VIZ translation, this attack is called Fang Flash.

Non-Canon Variants

 * Tekkai "Sansetsu Lariat" (鉄塊「三節ラリアット」): Used by Shuzo. Shuzo throws his arm back, hardens his body with Tekkai, and finally swings his arm forward. This attack is strong enough to counter one of Sanji's kicks, but its full effects are not shown due to it being deflected. The name of the technique most likely came from the fact that Shuzo's attacking arm has three sections due to it having two elbows instead of one.

Trivia

 * Tekkai is similar to Busoshoku Haki, as both reinforce the user's body in some way, the difference being that Tekkai is based on the user's physical power while Haki is based on the user's willpower.
 * Though acknowledged as a Rokushiki master, Kalifa is never seen using Tekkai.
 * Tekkai appears to be based on the Iron Shirt technique in Chinese martial arts, which utilizes the natural energy (ki) to strengthen the body's resilience.

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