Non-canon warning: This article or section contains non-canonical information that is not considered to be an official part of the Legend of Zelda series and should not be considered part of the overall storyline.
The Book of Koridai is an item from Link: The Faces of Evil. Link obtains this item after defeating Glutko in the Shrine of Koridai. A translator named Ipo, who can read the Book of Koridai, reveals that this book itself is enough to defeat Ganon. After trekking through Ganon's Lair, Link finally reaches Ganon, who attempts to recruit Link with the promise of great power and the threat of murder; but Link turns down his offer and instead imprisons him within the Book of Koridai.
Non-canon warning: Non-canonical information ends here.