Koalinth

A race of Hobgoblins created by the Archdevil Glasya  (daughter of Asmodeus) shortly after the Second Godswar .
Glasya created the Koalinth to be her own people on Erdde, to fight her wars for her, but she needed to do this in secret, knowing that her father would not have approved. Thus, the Koalinth were created to live under the sea, but able to breathe air above the surface.