Keyblade

The Keyblades (キーブレード) are mysterious weapons that are heavily featured in the Kingdom Hearts series. Wielded by the main character, Sora, as well as a number of other important characters, the Keyblade is a main part of the battle between Darkness and Light.

Development
According to an interview with Tetsuya Nomura, the original weapon shown during development was actually a chainsaw-like weapon. This was eventually scrapped in favor of the Keyblade.

Kingdom Hearts Birth by Sleep
Ten years before Sora's first journey, there were eight known Keyblade wielders: Ventus, Aqua, Terra, Master Eraqus, Master Xehanort, Vanitas, Master Yen Sid, and Mickey Mouse. When they confront him at the Keyblade Graveyard, Master Xehanort explains to Terra, Aqua, and Ventus that the Keyblades at Keyblade Graveyard are the remains of the Keyblade Wielders after the Keyblade War between the forces of Light and Darkness.

At one point, Terra performs the Keyblade Inheritance Ceremony with Riku, making the child into a potential Keyblade wielder, and Aqua accidentally does the same with Kairi. She meant to perform it purposefully with Sora before deciding against it, but instead Ventus is the one who gives Sora the ability, when the two boys join hearts after the destruction of the χ-blade; however, neither of them realize it at the time.

Kingdom Hearts
When the worlds first started to disappear, King Mickey realized that Kingdom Hearts was going to be opened, and went to the Realm of Darkness to find its Keyblade, with which he could seal the door. However, he would also need someone to use a Keyblade from the Realm of Light in concert with him, so he left a letter for Donald Duck and Goofy, asking them to find the chosen wielder of that Keyblade and assist him in saving the worlds.

When the Heartless invade Destiny Islands, Sora rushes to the small island to save his friends, but finds that Kairi and Riku have already been swallowed by darkness. It is at this point that the Keyblade which Terra had promised Riku finally appears on the island, but because Riku has already given himself to darkness, the Keyblade falls to Sora's ownership.

When Sora first arrives at the Traverse Town, he meets Leon which later gives him shelter and some insight about the Keyblade and Heartless. Yuffie and Leon have to get Sora off the Keyblade since it's the only way to "conceal his heart (Sora's)," this is due to the Heartless fear of the Keyblade and they will stop at nothing to eliminate the wielder of the weapon.

On Atlantica, King Triton is enraged when he finds out that Sora is the key bearer and he tells him that as a key bearer, one must not meddle in the affairs of another world and that Sora had violated the principle. He also thinks that the Keyblade and its wielder can only shatter peace and bring ruin.

Sora uses this Keyblade to seal the Keyholes of the worlds he visits, but when he arrives at Hollow Bastion, Riku reveals that the Keyblade was intended for him, and takes it back as Sora's heart falters. However, Sora soon confronts Riku, and the strength of his heart proves greater than Riku's, allowing him to steal the Keyblade back.

Confused and angry, Riku runs off and is found by Ansem, who convinces Riku to give Ansem his body in exchange for more power. This new "Dark Riku" summons the Keyblade of People's Hearts from the Princesses of Heart, in order to unlock the Final Keyhole, but it remains incomplete due to it lacking Kairi's heart. When Sora tracks down Dark Riku and confronts him, Dark Riku reveals that Kairi's heart is in fact within Sora, and attacks Sora in order to steal it. Sora defeats Dark Riku, but in order to restore Kairi's heart and fully seal the Final Keyhole, he uses the Dark Riku's Keyblade on himself, completing the keyhole and restoring all of the Princess's hearts at the cost of his body and soul.

Later on, after Sora, Donald, and Goofy defeat Ansem and attempt to close the door to Kingdom Hearts, King Mickey finally reappears with the Kingdom Key D, the Keyblade of the Realm of Darkness that he had gone to search for. With their help, as well as that of the restored Riku, they close the door, saving the worlds from the imminent flood of darkness.

Kingdom Hearts: Chain of Memories
Since Sora retained his memories and feelings as a Heartless, something only one other person had done, Axel becomes particularly interested in why the Keyblade chose Sora as its wielder. Tired of Xemnas's rule, Marluxia conspires with Larxene to use Naminé's magic to rewrite Sora's memories so they can use his Keyblade's power to overthrow the Organization.

Kingdom Hearts 358/2 Days
As Sora's Nobody, Roxas can use his Keyblade. In addition, Xion is created by Xemnas to ensure there will be a Keyblade wielder loyal to the Organization. Upon Xion's destruction, Roxas awakens the ability to wield two Keyblades, Sora's and Ventus's. The Keyblade was used during this time as part of Xemnas's plans for his Kingdom Hearts.

Kingdom Hearts II
Sora, Riku, Kairi, Roxas, and King Mickey can use the Keyblade. Sora uses the Keyblade to open new paths to new worlds through Gates. While King Mickey comes out occasionally to assist Sora, Riku receives his own Keyblade shortly before reuniting with Sora and Kairi in The World That Never Was.

Kairi's use of the Keyblade is limited to the Heartless surge in the Castle That Never Was.

Kingdom Hearts coded
Data-Sora can use his digital version of the Kingdom Key to fix the World source of Bug Blox and to seal the data Keyholes. His digital Keyblade was destroyed in Episode 5, but gained a new Keyblade in Episode 6. King Mickey explains that this Keyblade is tightly connected to the Power of the Heart, implying that his Keyblade is genuine.

King Mickey also uses his own Keyblade to defeat the Heartless that attack his castle.

Powers
As the name implies, in combat, Keyblades are used in a manner similar to swords. Despite the fact that most possess no actual cutting edge, Keyblades still make efficient combat weapons and are shown to be particularly effective weapons against Heartless, Nobodies, Unversed, and Dream Eaters. However, as a downside to this, the Heartless use the Keyblade as a homing beacon, and thus Keyblade wielders are at constant risk of Heartless attacks at any time.

Most Keyblade wielders are also able to extend their Keyblade's length with Light or Darkness for their ultimate attacks. This has been seen for Sora's Ars Arcanum, Roxas, Xion and Riku's Limit Break in Kingdom Hearts 358/2 Days, Sora and Riku's Limit, Eternal Session, and Terra and Aqua's Command Style, Blade Charge.

The main power of the Keyblade, however, is the ability to seal or open the barriers between worlds, as well as to "lock" a world's Keyhole, preventing the Heartless from attacking that world's heart. As an offset of this ability, the Keyblade can also be used to lock or unlock any lock and dispel certain magical barriers. The Keyblade opens and shuts locks by emitting a bright, thin beam of light; this can also be used as an attack against certain enemies, although it is not featured in general gameplay.

In addition to its base powers, it is possible to modify a Keyblade's appearance and powers by attaching various Keychains or Gears in the wielder's inventory. However, there are many Keyblades that do not possess a keychain for reasons unknown. Sometimes, a Keyblade wielder may also obtain more powerful forms of their personal Keychain, usually after having some kind of epiphany; for example, Aqua's Rainfell became Stormfall, Terra's Earthshaker became Ends of the Earth, Riku's Soul Eater became Way to the Dawn, and Roxas's two Kingdom Keys became the Oathkeeper & Oblivion. Despite these being treated as an upgrade to a specific Keychain, the wielder can still go use the original Keychains at will.

Inheritance requirement
The Keyblade has a special power that only lets a chosen wielder hold it. This is proven when Sora gives his Keyblade to Jack Sparrow, only to have it come back to his hand. In the final battle with Xemnas, Sora was able to hold Riku's Keyblade, and the same goes for Riku with Sora's Keyblade.

While there are many qualities a Keyblade wielder must have, the only known requirement is that they have an exceptionally strong heart.

It is implied in Kingdom Hearts Birth by Sleep that it is possible for a Keyblade Master to choose a person as their successor if they have the main qualities that allow them to hold a Keyblade, as Terra chose Riku to be his successor. Kairi seems to have inherited the same ability when she accidentally touched Aqua's Keyblade. Aqua originally considered choosing Sora to be her successor, but decided against it because Terra had already performed the ritual on Riku and she did not want the two to fight as she and Terra would. However, Sora nonetheless gained the ability to use the Keyblade when Ventus's heart fused with his own.

However, an Inheritance Ceremony may not be required to gain a Keyblade. In Kingdom Hearts Coded, the Data-Sora's false Keyblade was destroyed by Maleficent when she entered the datascape. However, through his exceptionally strong Heart, Data-Sora was able to summon a true Keyblade later in his journey. Whether this was his own earned Keyblade or an extension of Sora's is not yet known.

Keyblade Glider
In Kingdom Hearts Birth by Sleep, Terra, Ventus, and Aqua have the ability to turn their Keyblades into vehicles and use them to travel to other worlds. This ability has only been demonstrated by the trio, though Master Xehanort explains in his Xehanort's Report that he used them during his own apprenticeship.

Magic
Keyblades are natural conduits for casting magic, as seen when Sora uses his Keyblade to command his magical attacks. This is not to say, however, that magic cannot be performed by a Keyblade Wielder when they are unable to summon their weapon. Some Keyblades have the innate ability to enhance specific kinds of magic, and many also augment the user's magical abilities on a more general level. Keyblades can also augment the holder with other powers and abilities that they would not normally be able to use.

Multiple Keyblade and Sharing Keyblades
Keyblade wielders each have their own personal Keyblade they can summon and wield at any time (ie. Sora's Kingdom Key, Terra's Earthshaker, etc). However, Keyblade wielders can obtain new Keyblades alongside the one they normally wield, should they find a Keyblade without a master or are allowed to use it by its master. In the former case, the Keyblade wielder may summon and use the newly found Keyblade in place of their original at will. Such was the case with Aqua inheriting the Master Keeper after Eraqus' demise and Mickey finding the ownerless Kingdom Key D in the Dark Realm. Master Xehanort used this ability in the extreme when he mentally controlled countless Keyblades in has battle with Terra, Aqua, and Ventus.

In the case of sharing Keyblades, if one is capable of wielding a Keyblade they may utilize the Keyblade of another wielder as long as that wielder allows them too. However, no Keyblade wielder has been seen to summon another wielder's blade (with the exception of Riku summoning Sora's Kingdom Key, though this is a special case). Those incapable of wielding a Keyblade cannot hold a Keyblade, even if its wielder allows them to.

Sora and Roxas have demonstrated an ability called Synch Blade, which allows them to wield multiple Keyblades at once. Due to Ventus' Heart slumbering in Sora's, Sora is able to summon both his own and Ven's Keyblades at once. Though Roxas uses this ability at almost all times after defeating and absorbing Xion, using Oathkeeper and Oblivion, Sora has only been seen using this ability in his Valor, Master, and Final Drive Forms. It has been confirmed, however, that Sora is able to dual-wield Keyblades in his base state, as Sora and Roxas share all of the same abilities. Though Riku seems to use this ability in the Castle That Never Was, it has yet to be confirmed or denied whether any other Keyblade bearer can possess this ability.

Appearance
All Keyblades shown have the same distinguishing features that are modeled after a key: a guard with a handle, a hilt and a head at the end of the shaft that resembles the teeth of a skeleton key (with the exception of Fenrir, which is instead modeled after a key). Most Keyblades also have some theme, usually a world or a person associated with that world, that will reflect in its appearance.

Each Keychain has a unique animation for when the Keyblade is summoned, and these animations usually symbolize a specific aspect of its respective Keyblade. For example, when Oblivion is summoned, a dark aura and violet sparks surrounds Sora's hands before the Keyblade actually appears. The particle effects that appear when the Keyblade is used to hit something also change with each Keychain. For example, the Keyblade "Two Becomes One" uses black and white checkered crowns when a solid object is hit.

History
In the "age of fairytales," when the world was whole, the mysterious realm of Kingdom Hearts gave Light to the world as a gift. It remained out of the reach of mankind, and its power could only be unlocked using the χ-blade, a blade made in the image of the perfect crossing of Light and Darkness. In spite of the great Light of the world, men became jealous and greedy, and Darkness was born in their Hearts. They forged the first Keyblades - made in the image and named, possibly in confusion, after the χ-blade - in order to unlock Kingdom Hearts and gain that Light for themselves. Keyblade Wielders of Light and of Dark clashed in an event known as the Keyblade War. Even those who did not wish to possess Kingdom Hearts were eventually drawn in. Thousands lost their lives, and all Light was extinguished from the world, trapping Kingdom Hearts in the deepest darkness forever.

However, Light remained in the Hearts of children, and that Light drew the fragments of the world back together into whole, but separate and divided, pieces that are the worlds that exist today. Those few still possessing the strength of Heart to wield a Keyblade decided to use the weapon that had once destroyed the world to protect it. They formed a small order in the Realm Between and vowed to keep Darkness from upsetting the balance of the Realm of Light. The site of the Keyblade War became a barren world known as the Keyblade Graveyard, where no life ever grew.

Though the Keyblade ceased widespread use and the boundaries between worlds were hardly ever crossed, legends of the Keyblade grew throughout the worlds. One legend stated that the Keyblade was used to save the world, while another states that it wrought chaos and destruction upon it. It became feared, and some, like King Triton, refused to let its master use it on their world.

After a second attempt to forge the χ-blade, its use became almost non-existent, King Mickey being the only active wielder in the Realm of Light for nine years. Only when the Princesses of Heart were gathered to form the Keyblade of People's Hearts in a third attempt to create the χ-blade by clashing it with thirteen darknesses did the Keyblade reappear.

It is as-of-yet unknown how a Keyblade is truly manufactured. Only the χ-blade and the Keyblade of People's Hearts have been shown to be created, by the combining of special Hearts. However, the χ-blade is not truly a Keyblade, and the Keyblade of People's Hearts is a special case, quite unlike other Keyblades of Light and Darkness. The most information that has been learned is that Riku's Keyblade, the Way to Dawn, was able to manifest through his Soul Eater, using the sword as an intermediary.

Keychains
Sora's Keyblade is known as the "Keyblade of Worlds' Hearts", and nearly all of his Keychain tokens represent some important item from a world he has saved. Usually, Sora is not actually shown to be given the Keychain from one of his many friends, so it is possible that after saving a world, or completing a major step in that direction, the world itself rewards him with the ability to access its power in the form of a unique Keychain.

Keychains that Sora receives from his friends, or from defeating challengers in the Olympus Coliseum, always use a token that is somehow intimately symbolic of that person. While Sora's Keyblade is not specifically a Keyblade of human hearts, like the explicitly named Keyblade of People's Hearts, it is likely that the connections between his heart and those he meets allow him to sometimes access their power as well. Sora and Roxas's Oathkeeper and Oblivion are said to specifically embody Sora's memories of Kairi and Riku and Roxas's oath to Xion before her death (Oathkeeper) as well as her demise (Oblivion) and so it is extremely likely that for "people-Keyblades" like these, the Keychains act as a physical embodiment of the memories Sora and Roxas have of those that are important to them. Keyblades that represent entire worlds likely function the same manner, being formed from Sora's memories of that world.

In Kingdom Hearts 358/2 Days, Roxas utilizes Gears, which function more or less exactly the same as Keychains would, and create Keyblades that feature apparent Keychains. In Kingdom Hearts Birth by Sleep, the Keyblade wielders are able to use several different Keyblade forms, and although the forms have apparent Keychains, the items are never mentioned.

Prominent Keyblade wielders

 * This is a list of the Keyblade wielders most important to the storyline of the series. For a complete list, see List of Keyblade Wielders.

Sora
The most prominent character in the series to use a Keyblade is Sora, who has used them successfully in the two main games in the series (with one minor incident). His ability to use and possess the Keyblade was a major plot point in the first game. He has used more Keyblades than anyone else in the Kingdom Hearts series; the variations are created through various keychains attached to his original blade, the Kingdom Key.

King Mickey
The King of Disney Castle, King Mickey's Keyblade is known as "Kingdom Key D". It looks the same as Kingdom Key, but its colors are inverted compared to the Kingdom Key. In Kingdom Hearts coded and Kingdom Hearts Birth By Sleep, he uses the Star Seeker, the Keyblade he used in his days as an apprentice under Yen Sid.

Riku
Sora's best friend and rival, he wields the Way to the Dawn Keyblade, though in Kingdom Hearts he briefly took possession of Sora's Kingdom Key. In Kingdom Hearts, he stayed behind with King Mickey in the Realm of Darkness. In Kingdom Hearts: Chain of Memories, he explores the basement of Castle Oblivion and struggles in resisting the darkness in his heart, Ansem, Seeker of Darkness, while in Kingdom Hearts II, he helped Sora defeat Xemnas. In Kingdom Hearts: Chain of Memories and Kingdom Hearts, he used the Soul Eater as his main weapon until it transformed into the Way to the Dawn Keyblade.

Roxas
Sora's Nobody and the thirteenth member of Organization XIII, Roxas also possesses the ability to wield the Keyblade, an ability which Xemnas uses to his advantage by ordering Roxas to gather countless hearts to complete Kingdom Hearts itself. Upon the absorption by Roxas of his Replica, Xion, Roxas regains the ability to wield the two Keyblades, Oblivion and Oathkeeper, an ability passed onto Sora when Roxas fuses with him.

Terra, Aqua, and Ventus
Three Keyblade wielders before Sora, apprentices under Master Eraqus. Sharing a common foe, Master Xehanort, they each suffer horrific fates due to Xehanort's doing at the end of the game: Terra is possessed by Master Xehanort and becomes Terra-Xehanort; Ventus is rendered comatose after his heart is damaged following a victorious confrontation with his dark side, Vanitas; and Aqua is stranded in the Realm of Darkness. All three currently await for Sora to rescue them from their fates.

Master Xehanort
Master Xehanort is the primary antagonist of the "Xehanort Saga", but makes his appearance through a variety of incarnations, most of which can wield the Keyblade. He himself is a Keyblade Master who plans to restart the Keyblade War; his hybrid form Terra-Xehanort has the same abilities, but is inflicted with amnesia soon after creation and forgets how to use them until shortly before he splits himself into a Heartless, Ansem, and a Nobody, Xemnas. While Ansem is implied to have required Riku's body to wield the Keyblade of People's Hearts, series-creator Tetsuya Nomura has hinted that Xemnas had the ability but intentionally did not exploit it. Master Xehanort's youthful, time-travelling "Young Xehanort" identity can also wield the Keyblade as well as weapons similar to Ethereal Blades, and No Heart, a data simulation of Xehanort in his Keyblade Armor, wields a data simulation of Master Xehanort's Keyblade.

Trivia

 * In Kingdom Hearts, the Keyblade disappears until Sora starts attacking, while in Kingdom Hearts II and Kingdom Hearts Birth By Sleep, it reappears as soon as the player approaches an enemy. In Kingdom Hearts 358/2 Days, the Keyblade appears when Roxas takes damage or begins attacking. In the manga, Sora keeps his Keyblade behind him, strapped to his belt.

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