The Library, part of the Storage, holds information about monsters and game play mechanics. It is divided into two parts: The Monster Encyclopedia and the Compendium.

The Monster Encyclopedia keeps entries of monsters that the player has encountered in battle. The monster has to be faced in battle for its entry to be unlocked in the encyclopedia.

The Compendium keeps track of the various information given by the NPCs of the game. It lists tips on monsters, battle arts, and battle mechanics. More entries are unlocked as the player progresses through the game, which is every time an Arcana monster is defeated.