The Aetheric Sargasso
The Hollow Earth is a vast, primeval wilderness; teeming with prehistoric life. Vast plains and seas bounded by towering mountain ranges hold samples of flora and fauna from all the Ages of Earth and its alternates. Dotted across the plains are enclaves of humans and proto-humans, each struggling for survival. Lost colonies from dozens of Civilizations compete with each other and a strange race of Reptile People for dominance in this Lost World.