Top Down

The top-down approach is great if you have a lot of time to dedicate to world building. When designing a setting from the top down, your initial focus is on the big picture. You might already have an idea of the big movers and shakers of your world or your multiverse. You might want to chronicle a thousand years or more of the setting's history. You might have already sketched out a galactic map with each planet's continents, nations, and factions spanning these worlds. This approach begins with broad generalities that get more detailed during play and as you design them.