Allagan Empire

[VargasVermillion]

While we're on the subject of the 12 one Limsan Lominsan tale was that when the world was created the land was dry, so Nymeia created a serpent who then task to bring water into the land. But that serpent didn't and was going to flood the world, so she sealed the serpent up to stop. And that where the motto "till sea swallows all" came from.

Not sure if that was talking about leviathan or midgardsomr

I'd say leviathan, He was also worshiped by pirates as the patron god of the seas. Plus he's all about flooding things and has a distaste of land dwellers, I heard somewhere that the primals used to exist along side the twelve before the spoken races came to eorzea.