Editing Castle Oblivion

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{{expand|create=add room names from non-gameplay sources, like the White Rooms from the reports, and "World Warp" object -- also create the World Warp redirect}}

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

  |romaji=Boukyaku no Shiro

  |game6=Kingdom Hearts 3D: Dream Drop Distance  

'''Castle Oblivion''', often abbreviated as "'''C.O.'''" by members of [[Organization XIII]], is a world introduced in ''[[Kingdom Hearts Chain of Memories]]''. It is located within the Realm Between, though a digital copy of the world appears in ''[[Kingdom Hearts coded]]''. It was governed by [[Marluxia]], and consists of thirteen floors and twelve basements. After Marluxia's defeat, the Organization abandoned the castle as they lacked the manpower to keep it operational. Hidden within the castle is the Chamber of Waking, where [[Ventus]] sleeps; no one but Aqua can locate the Chamber, as she was the one who designed the layout of the castle to keep Ventus safe.

;Sora's Tale I

''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.''

==Settings and Areas==

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 {{nihongo|'''{{a|Entrance Hall}}'''|入口ホール|Iriguchi Hōru}} and {{nihongo|'''{{a|Exit Hall}}'''|出口ホール|Deguchi Hōru}} for each floor. Additionally, Sora slept in his [[Memory Pod]] within the {{nihongo|'''{{a|Pod Room}}'''|ポッドルーム|Poddo Rūmu}}.

In ''Kingdom Hearts coded'', Data-Sora arrives in the Entrance Hall, which contains a large door that 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 {{nihongo|'''{{a|Station of Sorrow}}'''|悲しみの園|Kanashimi no En}}, a platform of stained glass disconnected from the rest of the world.

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

Castle Oblivion was originally the [[Land of Departure]]. After the events at the [[Keyblade Graveyard]], [[Aqua]] brought a comatose [[Ventus]] to the Land of Departure, which had been destroyed in a storm of darkness by Master Xehanort. In order to keep Ventus safe, Aqua follows [[Eraqus]]'s prior instructions to seal the world's Keyhole with his Keyblade and recreate it as a labyrinth that only she could navigate, using a means devised by prior guardians. She leaves Ventus in the castle's newly-formed [[Chamber of Waking]] and promises to bring [[Terra]] back with her before waking him up. As Aqua leaves to search for Terra, she looks back on her transformed home.

The castle is eventually discovered 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 with which to form personalities. Xemnas sends [[Xigbar]] and [[Xaldin]] to recruit more members for the Organization, as they need a large group in order to run the castle. Despite rumors among the Organization that Xemnas intends to locate the Chamber of Waking, to complement the [[Chamber of Repose]] built under [[Hollow Bastion]], they never do.<!--cite kh2fm flashback scene-->

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.

{{coded}}