Book of Prophecies
The Book of Prophecies (予知書, Yochi sho?) is a book that appears in Kingdom Hearts χ and Kingdom Hearts Union χ. It is the source of Cards and Medals, which allow Player to harness powers from the future.
Kingdom Hearts χ
By using the power he installed into the No Name Keyblade, the Master of Masters wrote the Book of Prophecies which foretold the events that would lead up to the Keyblade War and what came after. He then placed his Gazing Eye in the Keyblade and gifted it to one of his apprentices, Luxu, in order for it to make and transmit back through time the observations which would compose the Book in the first place. In order to prevent undue temporal paradoxes, he did not give Luxu a copy of the Book. Instead, he gave copies to his five other apprentices, who became the foretellers, with all but Gula's omitting the "Lost Page" (ロストページ?) which covered the events of the betrayal of the foretellers, and how the Keyblade War would begin.
After reviewing the manuscript, the foretellers discovered the shocking final entry, which prophesied:
To avert this crisis, the foretellers established Unions to battle the darkness and used the Book of Prophecies to draw power from the future. Player's Chirithy later informs them of its creator's actions so they can understand the source of their power.
When the Master of Masters hands Ava a list with the five Dandelion Union leaders that eventually would succeed the foretellers after the Keyblade War, he encircled one of their names red to ensure this one would get a copy of the Book of Prophecies, along with the rulebook all five would receive.
However, Ava reneges on the Master of Masters' orders in hopes of changing fate. She chooses Brain to be a Union leader and gives him a copy of the Book of Prophecies, as he had not been chosen by the Master of Masters to receive it. Before parting with him, she places the memo from the Master of Masters in Brain's copy of the Book of Prophecies, hoping that he would understand it when the time came to decide their future.
Kingdom Hearts Union χ[Cross]
After the conclusion of the Keyblade War, the new Union leaders discover a new species of Dream Eaters that can banish Nightmares from their masters. Brain sends Ephemer, Skuld, and Ventus to collect the necessary ingredients to create them while he and Lauriam stay behind to make the necessary preparations.
Over time, Brain continuously reads through the book, believing that they were still on a destructive path. Brain resolves to be the virus that overwrites their destiny in order to avoid another Keyblade War.
After Ephemer's return and Brain figured out that they all trapped in a digital copy of Daybreak Town, aware that Master Ava didn't plan this but someone else reaffirms his promise to become the virus and overwrite it. He goes below and wonders if any of this was written in the book.Brain continues to look through the book aware that now is the right time he takes the memo from the it.
Noticing that something else isn't right and summons his Chirithy asking it to find Ventus and Skuld. Meeting with Ephemer, he discusses how Master Ava choose them to be Union Leaders and unveils that only one of them was suppose to receive the book. Ephemer was even more surprised that Brain had it as it was given to him by Master Ava in her attempt to change things meaning Brain wasn't the original owner.
While talking with the Darkness entity, the Union Leaders discover that Master of Masters had written the Book of Prophecies and in it they find out that Ventus was the one to harbor the Darkness as the "fated child".
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Kingdom Hearts Re:coded
Following their defeat in the Datascape, Maleficent and Pete discuss the ancient Book of Prophecies. According to legend, it is capable of transcribing and conjuring future events, as well as creating entire worlds filled with beings and powers that have yet to exist. Maleficent decides to search for a connection between the Book of Prophecies and the Datascape, and she wonders if the Book is also connected to Jiminy's Journal.
Kingdom Hearts III
Notes and references