I like the idea of world/lore building in game but with point limitations to keep things even. Say once a week you get 5 points that allow you to introduce new lore.

A new hero/character could be 1
A new basic race 1, advanced 2 monsterous 3
Town 1 city 2 capitol 3 
Island 1 special landmass/location 2, country 3

So as you want to write in something new you use creation points. If you don’t have any, you just have to wait and work on what others have created.

The most basic concept and delivery of this would be from the aliens side as we explore the new lands discovering new creatures and cultures.