The Book of Prophecy is the key to rebuilding a corrupt world. At the start of the game, the hero or heroine has a dream under a ruin in which the book explains its purpose and tells you what to do. All of the book pages are blank when you find it and to gather more pages, you must collect tablets or scan objects. Every object that can be interacted with has a code. The Book of Prophecy is hunted by many groups and requires four spirits to use its full power. Each spirit is bound in some way to the book to restrict its power. No one but its own and special individuals can see the book, its pages, or its spirits.