The Codex is an essential resource complementary to the game's SRD. It brings together information specific to the universe in which your adventure takes place.
Each game universe has its own Codex, offering details on ancestry, classes, outfits, weapons, items, creatures, and anything else related to that particular universe. In addition, the Codex may offer rule adaptations or additions specific to this universe to enrich your gaming experience.
In summary, the Codex is your guide to exploring and understanding the universe in which your adventure takes place. It will help you personalize your gaming experience based on your chosen universe, providing clear information and resources to enrich your story and characters.
Example :
The Fantasy Codex will provide you with details on fantasy races, character classes as well as information on this universe's iconic weapons, mythical creatures and magical items specific to medieval fantasy.