Editing Castle Oblivion

{{Game|COM|REC|KH2|FM2|358|BBS|FMB|KHC|RCO|DDD|HD1|HD2}}

{{Youmay|the castle|[[Oblivion|the Keyblade]] or [[Castle Oblivion (chapter)|the manga chapter]]}}

  |romaji=Boukyaku no Shiro

  |game1=Kingdom Hearts: Chain of Memories

  |game6=Kingdom Hearts 3D: Dream Drop Distance  

'''Castle Oblivion''', often abbreviated as "'''C.O.'''" by members of [[Organization XIII]], is a world found in the Realm Between in ''[[Kingdom Hearts: Chain of Memories]]'', and is one of only two real worlds that appears in ''Kingdom Hearts: Chain of Memories''. It also appears within cutscenes in ''[[Kingdom Hearts 358/2 Days]]'', ''[[Kingdom Hearts Birth by Sleep]]'', and a digital copy of the world appears in ''[[Kingdom Hearts coded]]''. It was governed by [[Marluxia]], and consists of thirteen floors and twelve basements.

===''Kingdom Hearts: Chain of Memories''===

''Our friends may be here...It was that thought that led us to Castle Oblivion, where cards rule all.''

''A mysterious man gave Sora a card, and using it took us to Traverse Town—of all places!''

''It turned out the town was just a figment of our own remembrances, the first world of many that lie in Sora's heart.''

''And so our journey through these worlds begins.''

In ''Kingdom Hearts: Chain of Memories'', Sora and Riku create the layout of Castle Oblivion themselves from their memories of the worlds they have visited (except Deep Jungle for both characters and the 100 Acre Wood for Riku), using [[Map card]]s. There is also an '''{{a|Entrance Hall}}''' and '''{{a|Exit Hall}}''' for each floor. Additionally, Sora slept in his [[Memory Pod]] within the '''{{a|Pod Room}}'''.

In ''Kingdom Hearts coded'', Data-Sora arrives in the Entrance Hall, where there is a large door. The door allows Data-Sora to access re-imaginings of worlds, including '''{{a|Destiny Islands}}''', '''{{a|Traverse Town}}''', '''{{a|Wonderland}}''', '''{{a|Olympus Coliseum}}''', '''{{a|Agrabah}}''' and '''{{a|Hollow Bastion}}'''. Data-Sora battles Data-Roxas in the '''{{a|Station of Sorrow}}''', a platform of stained glass disconnected to the rest of the world.

[[File:Terra's Guidance 01 KHBBS.png|250px|right|thumb|Aqua in front of Castle Oblivion.]]

Castle Oblivion was initially the world [[Land of Departure]]. After the defeat of [[Eraqus]] at [[Terra]]'s hand, [[Master Xehanort]] summons the darkness to destroy the land. After the events at the [[Keyblade Graveyard]], [[Aqua]] brought a comatose [[Ventus]] to the Land of Departure to the dilapidated castle to keep him safe. Remembering how Eraqus told her that he and others before him who safeguarded the Land of Departure devised a means to seal the world's keyhole to prevent anyone who would threaten the land's neutrality, Aqua honors her master's final request by using the method to recreate the world so that only she knew the structure and layout of it and that any unwelcome visitors would be "lost in oblivion". As a result, she uses [[Master Keeper|Eraqus's Keyblade]] to seal the world's keyhole and recreated the world into Castle Oblivion. She then leaves Ven in the newly-formed [[Chambers of Repose and Waking|Chamber of Waking]] and promises to bring Terra back with her before waking him up. When Aqua departs from the building to go look for Terra, she turns around to look at her new home, completely transformed.

===Between ''Kingdom Hearts Birth by Sleep'' and ''Kingdom Hearts: Chain of Memories''===

The castle is eventually found by [[Xemnas]] of Organization XIII, who decides to convert it into a second headquarters for the Organization. It is intended to be a place to research memories, an important topic to the [[Nobody|Nobodies]] of the Organization, who have only their memories to form personalities with. Xemnas sends [[Xigbar]] and [[Xaldin]] to recruit more members for the Organization, as they need a large group in order to run the castle.

According to a flashback in ''[[Kingdom Hearts II Final Mix]]'' that takes place in between ''Kingdom Hearts Birth by Sleep'' and ''[[Kingdom Hearts (game)|Kingdom Hearts]]'', Xigbar and [[Zexion]] discuss the new castle and the [[Chambers of Repose and Waking|Chamber of Repose]], which house Aqua's armor and [[Keyblade]], that Xemnas constructed in [[Radiant Garden]] while he was [[Xehanort]], and which he frequently went to. Xigbar believes that Xemnas was looking for the complementary Chamber of Waking, and that this place might be somewhere in Castle Oblivion.

===''Kingdom Hearts: Chain of Memories''===

After defeating [[Ansem, Seeker of Darkness]], and restoring the damaged worlds, [[Sora]], [[Donald Duck]], and [[Goofy]] find themselves in a grassy field with [[Mickey Mouse|the King's]] dog, [[Pluto]]. They follow Pluto along the path to Castle Oblivion, and as soon as they enter the castle, they forget all of their skills and are forced to rely upon the castle's memory-based card system. Although Marluxia and Larxene tell them their memory loss is simply the nature of the castle, it is revealed that the mysterious girl Naminé is actually the one reshaping Sora's memories, so that Marluxia can use Sora as a puppet against Xemnas. The scheme fails thanks to the meddling of Axel (who was actually on orders from Xemnas and [[Saïx]] to rid the Organization of traitors), who frees Naminé, and Marluxia and Larxene are destroyed at Sora's hand. Sora then uses one of Xemnas's pods so that Naminé can restore his memories, and is eventually moved to [[Twilight Town]].

Meanwhile, Sora's friend [[Riku]] awakens from the darkness within the lowest basement of Castle Oblivion, where he faces the remaining darkness of "Ansem". Though he initially sets out to destroy the indelible darkness in his heart, with the help of [[Ansem the Wise|DiZ]], Naminé, and King Mickey, he is able to eventually embrace both the light and the dark, achieving balance. The three basement members, Vexen, Lexaeus, and Zexion seek to recruit Riku in order to counter Marluxia's use of Sora, but Riku denies their requests and vanquishes them. Riku eventually defeats the Ansem in his heart, and decides not to have Naminé seal it away completely; instead, he sets out on the "road to dawn" in order to help while Sora is sleeping.

After members of Organization XIII are sent to Castle Oblivion, [[Roxas]] learns from [[Demyx]] and Xigbar on Day 24 that the members assigned to Castle Oblivion have been annihilated.  

On Day 296, when Roxas learns from Axel that Xion was born in Castle Oblivion, he becomes determined to investigate the place for himself. The next day, Roxas was assigned to go there and hunt down [[Riku|the impostor]]. Roxas used the opportunity to investigate Castle Oblivion. Axel chose to tag along claiming that he knows the place better than anyone else in a black coat. However, barely has Roxas walked in the door when he is overcome by a strange weakness and passes out entirely, due to how close he physically was to Sora and Ventus.<ref>'''''[[Kingdom Hearts Ultimania|Kingdom Hearts Birth by Sleep Ultimania]]''''' "...Because he had gotten too close to both Sora and Ventus, his 'real self'."</ref>  

After defeating [[Sora's Heartless]] and returning to the data worlds, [[Data-Sora]] enters a data version of Castle Oblivion. He has meetings with the mysterious cloaked man, as well as various figures from Sora's memories. Like the real Sora did, Data-Sora uses World Cards to traverse the castle. One notable feature of this incarnation of Castle Oblivion is that the White Rooms do not change form completely; the design remains like the rest of the castle, although the shape of the room differs. Pictures of areas from the worlds are displayed on the walls. Near the end of the story, he meets Data-Naminé, who explains the reason of his existence.

Ventus continues to sleep within the Chamber of Waking, following the end of Sora and Riku's Mark of Mastery exam. Upon Sora's return to Traverse Town, he smiles from Sora's happiness.

File:Naminé KHRECOM.png|[[Naminé]]<br>{{KHCoM}} {{KHD}}

File:DiZ KHII.png|[[Ansem the Wise|DiZ]]<br>{{KHCoM}} {{KHD}}

File:Vexen KHD.png|[[Vexen]]<br>{{KHCoM}} {{KHD}}

File:Lexaeus KHD.png|[[Lexaeus]]<br>{{KHCoM}} {{KHD}}

File:Zexion KHD.png|[[Zexion]]<br>{{KHCoM}} {{KHD}}

File:Axel KHD.png|[[Axel]]<br>{{KHCoM}} {{KHD}}

File:Marluxia KHD.png|[[Marluxia]]<br>{{KHCoM}} {{KHD}}

File:Larxene KHD.png|[[Larxene]]<br>{{KHCoM}} {{KHD}}

File:Data-Roxas KHREC.png|[[Data-Roxas]]<br>{{KHc}}

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File:Shadow KHII.png|[[Shadow]]

File:Soldier KHII.png|[[Soldier]]

File:Large Body KHII.png|[[Large Body]]

File:Red Nocturne KH.png|[[Red Nocturne]]

File:Blue Rhapsody KH.png |[[Blue Rhapsody]]

File:Yellow Opera KH.png|[[Yellow Opera]]

File:Green Requiem KH.png|[[Green Requiem]]

File:Darkball KH.png|[[Darkball]]

File:Wyvern KH.png|[[Wyvern]]

File:Defender KH.png|[[Defender]]

File:Wizard KH.png|[[Wizard]]

File:Invisible KH.png|[[Invisible]]

File:Angel Star KH.png|[[Angel Star]]

File:Neoshadow KHII.png|[[Neoshadow]]

File:Ansem (First Form) KH3D.png|'''[[Game:Ansem, Seeker of Darkness|Ansem, Seeker of Darkness]]'''

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File:Riku (Dark Mode) KH.png|'''[[Game:Riku Replica|Riku Replica]]'''

File:Vexen KHD.png|'''[[Game:Vexen|Vexen]]'''

File:Lexaeus KHD.png|'''[[Game:Lexaeus|Lexaeus]]'''

File:Axel KHD.png|'''[[Game:Axel|Axel]]'''

File:Marluxia KHD.png|'''[[Game:Marluxia|Marluxia]]'''

File:Marluxia (Second Form) KHRECOM.png|'''[[Marluxia (Second Form)]]'''

File:Marluxia (Third Form) KHRECOM.png|'''[[Marluxia (Third Form)]]'''

File:Larxene KHD.png|'''[[Game:Larxene|Larxene]]'''

File:Data-Roxas KHREC.png|'''[[Game:Data-Roxas|Data-Roxas]]'''

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File:Tidus KHREC.png|'''[[Game:Tidus, Selphie, and Wakka|Tidus]]'''

File:Pete KHREC.png|'''[[Game:Pete|Pete]]'''

==Other Appearances==

*In the manga, the monitors through which the Organization watches Sora are "Nomura-brand", a reference to Tetsuya Nomura, the director of the ''Kingdom Hearts'' series.

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