Castle Oblivion originated in Kingdom Hearts Birth by Sleep after Ventus feel into a comatose state. Aqua created Casltle Oblivion to have a place to keep Ventus safe. Castle Oblivion is also used as a headquarters for Organization XIII. In Chain of Memories, Sora, Donald, Goofy, and Jiminy Cricket search the Castle hoping to find Riku and the King, but end up losing their memories and having to fight the Organization instead. They are then contained in sleeping capsules in the castle until their memories return.
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