Thras

The Coral Kingdom has been a powerful, antagonizing power against the Summerset Isles since before recorded time. The Sload may at one time have even called Summerset part of Thras. For millenia, the hulking, slug like creatures, notorious for their necromantic mastery terrorized the Altmer, conjuring sea monsters along the coast and laying siege to Skywatch. But for all of the attacks, horror, and devestation coming from Thras, we know very little about the land itself.

Geography
The first maps that were made by cartographers who sailed to Thras and lived to tell the tale show a group of sixteen islands, in a semicircle like a partially submerged coral atoll. Over the centuries other maps have been charted by spies and the number and size of the islands has varied, suggesting that the amphibious Sload have a volatile kingdom which fluctuates in land mass, either by the tides or some other, less natural means. The largest of the islands, Agonio, seems the most stable, though later maps show it considerably larger than earlier ones.

Many Altmer have been captured by the Sload, and a few have escaped to tell of the brackish lagoon in the center of the island chain. There the buoyant creatures may move about with relative quickness and grace through an intricate network of coral formations and ancient shipwrecks.

History
The reach of Thras has been felt far beyond its own land. The Thrassian Plague which decimated Tamriel's population in the year 2260 of the First Era was their most outrageous attack against the mainland. When the Redguards came to Tamriel in 1E 808, they brought with them a tradition of burying their criminals on islands of their shore, to prevent their evil spirits from disturbing the living. The Sload took advantage of these graceyards of the coast, finding them suitable laboratories for their necromancy. The Redguards pushed back against the invaders, but reports of Sload living off the coast near settled lands from Stros M'kai to Abibon-Gora have surface well into the Third Era.

Recently the Sload have been quiet for the past thirty years. Their hero, the King of Worms, Mannimarco, has likewise ceased to trouble Tamriel.