Kikoku

Kikoku is the name of Trafalgar Law's sword. It is a "Cursed Sword" (妖刀), though is not a ranked blade.

Appearance
Kikoku is a larger version of the katana known as an Ōdachi. It has an oblong-shaped hilt trimmed with short white fur, a purple grip with two white rings around it and a yellow pommel, sheathed in a black scabbard decorated by white crosses from the opening to the bottom, and with a small piece of red rope tied near its opening.

Due to its size, Law usually carries Kikoku over his shoulder (in contrast to other sword-wielding characters in the series, who either carry theirs on their hips or over their backs); yet in other times, he delegates one of his crewmates (Bepo) to carry it for him.

Abilities
Most of Kikoku's actual capabilities are unknown, as more often than not, Law combines it with his Ope Ope no Mi powers, serving as a "scalpel" to cut people or as an "injection needle" to pierce others. At full power, he could bisect an entire mountain and a meteor. Alone, Kikoku was durable enough to block Doflamingo's strings, a notable feat as most weapons since then were easily cut by these strings unless they were infused with Busoshoku Haki.

Techniques

 * Amputate: Law's basic offensive technique. Law cleanly cuts his target with Kikoku without actually harming them. Law's sword doesn't actually have to make contact with the enemy to cut the target apart. The separated body parts seem to maintain a connection similar to Buggy when using his Bara Bara no Mi powers. While Law has never called this technique before using it, he named it while explaining Radio Knife. Amputate also seems to be necessary when performing operations, in order to extract narcotics from patients, as he did so on the drug-addicted children on Punk Hazard. Law first demonstrated this move against a Marine soldier outside the Human Auctioning House in the Sabaody Archipelago, using it in combination with "Shambles". In the Viz manga and Funimation adaptations it is referred to as Amputation. An "amputation" is the removal of a body extremity by trauma, prolonged constriction, or surgery.
 * Radio Knife (ラジオナイフ): An advanced version of Amputate. Law charges his sword with electricity in a similar manner to his Counter Shock move and then quickly slashes his enemy, which results in the target being separated into several segments while also suffering an electric shock. The cutting itself, like Law's regular slash attacks, is not harmful; however, it differs from them as it prevents the target from briefly being able to reattach their own body, and is meant to be a counter to any abilities where one can re-assemble themselves from Law's original amputation abilities. It was used for the first time against Trebol inside his ROOM after using Shambles to swap his position with Doflamingo. A radio knife is a surgical instrument that uses a high-frequency electric arc to cut away or through tissue.


 * Injection Shot (ショット): While aiming at his target with a targeting reticle similar to his Scan that appears on his hand or blade, Law rushes towards them with his sword stretched out in order to stab them. Once the sword connects, Law makes it "fire" like a gun, making the target bleed in the aimed spot while pushing them back a fair distance. Law's signature ability of being able to cut objects from afar can still be used while performing this move, as seen when he cut through Trebol's Hanamizu Shinken Shirahadori without having to touch it with his sword, but the move can still be blocked by hitting the blade from the side. It was first used against Trebol, but was interrupted by Doflamingo before it made contact. Its first successful use was against Doflamingo himself.
 * Sterben: A technique used when Law had his right arm severed by Doflamingo. After using Takt on his severed arm, Law makes it spin. Because the arm is still holding Law's sword, it effectively ends up acting like a buzzsaw that cuts the opponent in a vertical motion. It was first used to defeat Trebol. Sterben means "to die" or "dying" in German, often used as a term for hospital deaths. In the Viz manga and FUNimation adaptations, it's called Sterben Blade. The kanji is read literally as "katana".

Awakened Techniques

 * Anesthesia: Law coats his sword with the essence of KROOM, allowing it to pierce through anything without harming the target, akin to spatial phasing. In addition, Law can enlarge his K-ROOM-coated blade for an increase of range, much like he does with a regular ROOM. Law first used this against Big Mom. The kanji's reading is "masui", the Japanese way of saying anesthesia.
 * Shock Wille: After piercing through a target with Kikoku, Law releases an electrical shock wave through it that fries the target from the inside. This move is very similar to Gamma Knife, but because the electric shock directly occurs from the inside instead of coming from the outside, it ignores whatever external defenses the target may have. It was first used against Big Mom, bypassing her normally monstrous external body defenses and making her bleed from the mouth. The technique's name is likely a pun on the German word Schockwelle (with the w sound being read with a v in German), meaning "shockwave".
 * Puncture Wille: One of Law's most destructive techniques. Law positions himself on top of a downed target and pierces them with Kikoku, pining their bodies down to the floor as his sword continuously extends downward and phases through the ground or whatever is in its way. Once Kikoku reaches a certain depth, Law releases a powerful shockwave that implodes everything solid pierced by the blade, causing massive damage to living beings and creating huge holes on rocky surfaces. This move was strong enough to cause a massive crater near the Flower Capital and was first used against Big Mom, visibly injuring her to an extreme degree. A "puncture" is another word for a centesis, the procedure of removing fluid from a body through an injection needle.

Video Game Techniques

 * Hone Kudaki (骨砕き): Law's neutral combo finisher after his Law Kick-to-Rolling Sobat in Gigant Battle 2, where he swings Kikoku-still-sheathed at his foe forward via an inward swipe.
 * Appaku (圧迫): Law's followup to his High Kick attack (upward weak attack) in Gigant Battle 2, where he stabs Kikoku's pommel straight up (while the sword is still sheathed) into the launched victim of the prior attack.
 * Enjintou (円刃刀): The followup to Appaku in Gigant Battle 2, where Law right afterwards twirls Kikoku-still-sheathed to end up holding it by the grip, then shoots up the shoots up the sheath by flicking it upwards off his sword as the sheath spirals upwards like a projectile to strike the foe from below; the sheath then lands back on the sword safely.
 * Funsai (粉砕): Law's diagonal upward attack in Gigant Battle 2, where he swings Kikoku-still-sheathed at his foe, only diagonally-upwards and with both hands on the weapon.
 * Tsukisashi (突き刺し): Law's followup to Funsai, where he akin to Appaku stabs upwards with his sword-still-sheathed, only diagonally upwards while instead holding it by the grip/hilt.
 * Kousho Hone Kudaki (高所骨砕き): A midair version of Hone Kudaki in Gigant Battle 2 as Law's midair diagonal upward attack, where he swings Kikoku's sheath obliquely upwards.
 * Hossa (発作): Law's dash attack in Gigant Battle 2, where he twirls Kikoku-still-sheathed before thrusting it by the pommel straight at his foe upon braking (akin to Appaku). The Japanese word hossa also applies to seizures, or a paroxysmal attack.
 * Resection: A technique only used in the video game One Piece: Gigant Battle! 2 New World. Standing in one side of ROOM, Law slashes from top to bottom. In surgery, a resection is the act of removing part or all of a body part, such as an internal organ; while an ablation is removal of material form surfaces of an object through erosive processes (such as vaporization and/or chipping). Used as one of his basic attacks, where it must be done via charging up his neutral basic attack input for around a second.
 * Accident: A technique only used in the video game One Piece: Gigant Battle! 2 New World. After getting into a crouching position on his knees upon landing from the air, Law creates ROOM with him in its center and slashes horizontally-outward via a sweeping slash, used as his downward midair attack via teleporting to the ground before slashing.
 * Transection: A technique only used in the video game One Piece: Gigant Battle! 2 New World. Standing in one side of ROOM, Law slashes from bottom to top. A transection is a division by cutting across or a cross-section along a long axis. Like his Amputate, it oddly enough has the same kanji and literal reading as the said technique (setsudan). This was due to the attack being named before Law named his basic Amputation ability in the manga/anime.
 * Catastrophe (カタストロフィ): A technique that appears in the video game One Piece: Gigant Battle! 2 New World, where it is used as his strongest special attack. In the space created from ROOM centered around himself, Law cuts those within many times with rapid slashes as he slowly moves forward, then finalizes it by replacing the victim's head with a cannonball via Shambles.
 * A similar technique is also used as his inverted S3 (Triangle x2, Square) in the One Piece: Pirate Warriors games, where he simply cuts with his sword rapidly (flailing it around with a single hand) while standing stationary, and instead ends it with a Takt. The original version of the move can be somewhat replicated if Law uses his R1 ability to lay down another ROOM during the inverted S3 to instantly transition into the C5 (Square X4, Triangle) version of his Shambles. However, in Pirate Warriors 4, it becomes his airborne C5 (Square x4, Triangle) instead.
 * In One Piece: Super Grand Battle! X however, this acts as Law's Secret Attack, and is a variation on his wide-scale slash used to defeat Vergo. First for the intro scene, Law forms a large ROOM to lift up a marine ship (via Takt) much like at Punk Hazard, then cuts it in half. A large ROOM on the arena forms as Law stands from the foreground, slashing away at the space to cut up all targets within it 16 times; then just like in Gigant Battle! 2 New World, he ends it with a Shambles via snapping his fingers to replace his target(s)' head(s) with an incendiary object, only he instead uses a blue bomb with a fuse (also used by the midair strong attack version of his Shambles in the same game).
 * Kaitengiri (回転斬り): Law draws Kikoku for a spinning slash attack forward. Used as his side weak attack in One Piece: Super Grand Battle! X, where it can be tapped for more spins/hits while also having enhanced range via ROOM. Can also be used in midair akin to Senkaigiri, only at a forward angle slanted-upward (though he first delays himself in a small drop then rises upward-forward after the first two spins).
 * Kiriage (斬り上げ): Law slashes upward in an outward slash to launch his target. Used as his upward weak attack in One Piece: Super Grand Battle! X, where it can have enhanced range via ROOM.
 * Nagiharai (なぎ払い): Law's neutral strong attack in One Piece: Super Grand Battle! X, where he slashes outward across in front of himself. Can have its range enhanced by ROOM. It should be noted that the term "nagiharai" (lit. mow sweep) is a term for "mowing down", with the "nagi" part being written in hiragana instead of kanji (薙ぎ).
 * Kiri Oroshi (斬り下ろし): The followup to Nagiharai via second input, where Law reaps downward with Kikoku. Used in One Piece: Super Grand Battle! X and can have its range enhanced by ROOM.
 * Senkaigiri (旋回斬り): Akin to the aforementioned Kaitengiri, only Law rises upward at a slight forward angle; can also tap the button for more spins/hits like the said Kaitengiri as well. Used as his upward strong attack in One Piece: Super Grand Battle! X, and can have its range enhanced by ROOM.
 * "Mou dare mo hikikaesene-!" ("もう誰も引き返せねェ!"): Used in Pirate Warriors 2 and 3 as his Level 2 Special Attack, and can be equipped as one of his many others in Pirate Warriors 4. Law creates a large ROOM, then tosses his up his sheath into the air and pulls Kikoku back with both hands gripping it over his shoulder. He then does an extremely wide slash that affects the entirety of the said ROOM, then afterwards catches his sheath to re-holster Kikoku. This is most likely a nod to his finishing slash against Vergo which split the majority of Punk Hazard in half; the quote for the name of this attack is also the same one Law speaks word-for-word, only he does not speak out its name in-game until Pirate Warriors 3. In the game's English release, the technique is called "No one will go back!".

Trivia

 * In the English localization of One Piece: Pirate Warriors 3, 4 and Jump Force, it is called Demon Howl in the term glossary gallery menu.
 * Kikoku is an archaic Japanese term for "the wailings of a restless ghost", especially when the character for "oni/ogre" if read in a Chinese context (gui/guay), refers to a ghost.
 * This likely reflects Law's desire to avenge the death of Donquixote Rosinante.
 * Law is rarely ever seen slashing with Kikoku directly. When he does use it offensively, a ROOM is often active, making the actual properties of the sword unknown.

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