Lorebook: your Characters finally know their world.
Until now, everything a Character knew had to be stuffed into its definition — and every line of worldbuilding stole space from personality. On July 24, 2026, Character.AI launched Lorebook: a separate library of world knowledge that stays out of the way until the story calls for it. It's the platform's biggest creator tool since Scenes, and it changes what a "deep" Character even means.
A Lorebook is a set of entries — side characters, locations, items, events, factions, rules of magic — each tagged with keywords. Mention a keyword in chat, and the Character pulls that entry into its response. One Lorebook can link to many Characters, so a whole cast shares one canon. It's in beta, (c.ai)+ subscribers first.
01 How it actually works
Think of it as a tripwire system for lore. You write an entry — say, the rival kingdom's history — and give it keywords. The entry sits dormant until someone mentions the kingdom in conversation; then the Character suddenly knows its history, because its creator actually wrote it, not because the model improvised something plausible on the spot.
That's the quality shift worth understanding: consistency. Ask about the locket twice, a week apart, and you get the same locket. Chats stay true to the story you're in, and the world reveals itself the more you poke at it — the way good fiction does.
02 One world, many Characters
The sleeper feature is sharing. A single Lorebook can link to any number of Characters, so creators can define a world once — a school, a space station, a small town full of secrets — and every Character in it draws from the same source. Chat with two members of the same cast and they know the same places, the same rules, the same events. Character.AI's own studio used Lorebook to give the casts of its (c.ai) series microdramas real knowledge of their shows.
Early-access creators are already stretching it: mystery Characters where uncovering one secret unlocks the keywords to the next — a story engine that reveals itself piece by piece — and a dating-game Character juggling a whole troupe of suitors, each with their own entry for motives and backstory.
03 Finding and building
- Finding Lore-linked Characters: look for the blue +Lore tag on discovery pages and profiles. An in-chat viewer lets you browse the world's details mid-conversation without breaking the scene.
- Building your own: on web, + Create → Lorebook. Start from scratch or use templates (side characters, locations, items, events, factions, world rules). Add entries with content and keywords, link Characters, publish. If it's your Lorebook, you can edit entries right from the in-chat viewer.
04 The craft angle
If you build Characters, Lorebook removes the oldest tradeoff on the platform: definition space spent on worldbuilding was definition space not spent on voice and personality. Now personality lives in the definition and the world lives in the Lorebook — triggered only when relevant, so it doesn't dilute the Character's voice in ordinary chat. Our advanced character design lesson covers the definition-writing habits this pairs with.
If you have (c.ai)+: take one existing Character and write just three Lorebook entries — a place, a rival, a secret. Keyword them. Then chat until you trip all three. You'll feel the difference between a Character that improvises its world and one that knows it.