A bestiary that updates the more you fight the same monsters. Giving you updated stats, types of attacks, etc. Not to mention lore on a specific monster. You can also get info from books, giving books a gameplay mechanic. Same with an encyclopedia. Locations, Deities, NPC's, etc. Anything you learn about either from interactions, lore objects in the world or books. Updates and keeps tracks. Don't need to remember in a 80+ game, not to mention not everyone knows about everything.
Yeah the player might not have anything to do with a specific deity or location but that doesn't mean it's not worth reading about it because lore is always cool.
