The Codex is your living encyclopedia — a private library where Characters, Locations, Artifacts, and Lore live together. When you create a Codex Entry for a character, fill in everything: their motivation, their wound, their mask. When you later write them into a chapter, you will have a reference that prevents continuity errors.
For locations, describe the sensory details — the smell of the market, the sound of the citadel bells. For artifacts, track which character holds them and when. The power of the Lore Repository is not just memory — it is the ability to see your entire world on one screen and find connections you never planned.
The best world-builders don't invent everything upfront — they discover it through their Codex..