Valusia was the kingdom furthest to the west of the Thurian continent in the Thurian Age of Earth’s pre-history. It was created and initially ruled by Serpent Men until they were overthrown by their human slaves. They attempted to control new human kingdom of Valusia from behind the scenes, using illusionary magic, when mankind’s memories of the past wars faded but they were again defeated in a secret war.
Finally they created a religion, the Snake Cult, to do the same thing again and almost succeeded. Their power was, however, eventually destroyed by Kull, an Atlantean barbarian who had gained the crown of Valusia by force.