Book of Prophecies
The Book of Prophecies (予知書, Yochi sho?) is a book that appears in Kingdom Hearts χ and Kingdom Hearts Unchained χ. It is the source of cards and medals, which allow the Player to harness powers from the future.
Kingdom Hearts χ
By taking advantage of a time loop involving Master Xehanort's 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 actually give Luxu a tome of the book. Instead, he gave tomes to his five other apprentices, who became the Foretellers, with all but Gula's omitting the "Lost Page" which covered the events of the betrayal of the Foretellers, and how the Keyblade War would begin.
After reviewing the tome, the Foretellers discovered the shocking "Last Passage", which prophesied:
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.