[quote=Joegreenbeen]
I think the idea of a world with water in the center would be cool. One of the worlds (if we're doing multiple) could have one civilization one the surface, and then a water living race in the core.
[/quote]

And over the years, the 'strik-hi' (Water Dwellers in their tongue) have evolved webbed hands and feet and can breathe under water, also developing their own language.