Oh man, scattered everywhere.
- https://chroniclesofelyria.gamepedia.com/Lore
- https://chroniclesofelyria.com/game/lore
- https://chroniclesofelyria.com/game/tribes
- The-Flower-Festivals-of-the-Pilgrimage-of-Renewal
- love-fortunately
- a-tale-of-longest-night-diary-of-a-vault-raider
- a-tale-of-queens-gaze-ilnajeren-and-the-lantern-man
- the-searing-plague
- the-stowaway-a-tale-of-elyria
- the-origin-of-the-sedecim
I'm sure I may have missed something. Digging around the site may turn up more results, particularly looking here through each post if you really got time :P
edit: remembered one I missed. Souzou's Flora and Fauna lore that has been snuck into the community journals. You can see part 1 and part 2 if you follow the links and scroll down to em :D