A creature's bestiary consists of three pieces of relevant lore information that can typically be used against it, either in combat or to predict its behaviour. Unlocking all pieces of lore about a monster also unlocks information on its tactics.

To unlock a creature's bestiary, a character must succeed on a Study action. Each piece of lore has a different DC, and after a Study roll, the player unlocks all lore pieces of a DC equal or lower than their total.