They reside in a continent in Hyperborea which will be known in the future as Mhu Thulan: specifically in cave systems under the four-coned extinct volcano named after them—Mount Voormithadreth, the tallest peak in the Eiglophian mountains. Their ancestors (as described by Carter's narrative) were originally thralls of the Serpent-people who escaped after the continent of the latter sank to the sea. They are shamanistic and apparently began dwelling underground in an effort to imitate their deity, Tsathoggua, under the leadership of the eponymous Voorm.