A flooded planet. Was science-centric to the global culture and only The Duality was permitted to be worshipped. Magic was banned: anything that someone did that was unexplainable was magic, and anything unexplainable from the natural world was viewed as a message from the Duality. Used to be a planet of thousands of islands, but now is entirely covered in water.
Some people survived the flooding by fleeing to Nubius, while others built underwater cities. Only Unknown have ever lived on Flobin.