Tefnut was one of the last of the inhabited worlds of SOS. This isbecause it was many millennium until the genetic arts had progressed to thepoint where humanoids could be altered to live completely under water, andstill be close enough to humans to pay the heavy tithes demanded by theMother World, Greld.

The race of Mermen is unusual in a number of different ways and theirstory is the early story of Tefnut. While genetic experiments showed thepossibility of creating an aquatic race, it was millenium until theTechnologists were successful in creating a viable being that would breedtrue forever.

This was the first planet to lose contact, and the last to bereconnected with the rest of SOS. And frankly, those on Tefnut could havecared less for the most part. In their thousands of years of isolation,they developed a society that was very different from all air breathingones.

The few islands that exist on this water world are held as holy placesusually dedicated to the Gods and acting as a point of communications withthose of the "airy" world.