The Grimoire is a database within Destiny. Entries are unlocked through playing the game in the form of "Grimoire Cards."
The list of Grimoire entries is sorted into six main categories—Guardian, Inventory, Allies, Enemies, Places, and Activities. Each of these categories has a number of sub-categories. Grimoire cards are earned through various ways, such as completing a Story mission, playing a match on a Crucible map, reviving a Dead Ghost, or discovering a Calcified Fragment. These cards are sorted into six main sections by subject.