Atlantis

Atlantis is a small island-continent in the ocean west of Thuria, and east of the Pictish Islands. It is the home of the Atlanteans, enemies of the Picts and of the civilized Seven Empires of Thuria. They established colonies on Thuria. It is hardly a coincidence that "Commorria" in the days of Kull so resemble "Cimmeria" in Conan's days. The Atlanteans did make war against the mountain-city in "The altar and the Scorpion". Perhaps arch-darkpriest Thuron is of Atlantean descent. It was the home of Kull. Priests of Xultha were sent from Na-hor to Atlantis.

In the Cataclysm that ended the Thurian Age, Atlantis sunk beneath the sea but many escape the destruction on ships, and join their continental colonies. There, the survivors are forced back into the stone age by lack of resources but become skilled in this medium and develop an artistic culture. They soon enter a war with the surviving Picts and lose to their superior numbers and stone-age military technology. The survivors of the war devolve back into apes. They eventually re-evolve into humans to become the Cimmerians of the Hyborian Age.

Fortunately, there were a few survivors of the Atlantean catastrophe. The largest concentration of survivors was in the southern city of Netheria, whose priests and intellectuals foresaw an attack by the Lemurians. They enclosed their small city in the dome of an unknown plastic-like substance, and excavated and fortified their city’s foundation. Consequently, when the continent of Atlantis fragmented, Netheria remained intact as it sank, coming to rest in a huge sub-sea cavern.

Tiny bands of Atlanteans managed to find refuge on neighboring islands and the European continent, which were buffeted by the Atlantis catastrophe but not destroyed. One group of refugees fled to Antillia, a group of islands nearby. Other Atlanteans in Europe eventually became the tribes of Cimmeria, which the man known as Conan the Barbarian would later come from. The nearby island of Attilan, home of the genetically advanced but reclusive Inhumans, also survived the cataclysm virtually unscathed.

About 500 years after the founding of undersea Atlantis, a group of Homo mermanus left the city and made their way to the Pacific Ocean. This group founded the city of Lemuria on the opposite end of the now submerged continent of Lemuria from that settled by the Deviants. Due to the acquisition and worship of the Serpent Crown, the magical artifacts from the pre-cataclysmic Atlantis, the Lemurians' complexions and features have taken a more serpentine cast than their Atlanteans forebears.