Any landmass or island in the Etherium is an empyra. Most empyraea float on the “surface” level of the etherium. Still, many exist at varying elevations within the spacial realm and some smaller empyraea even orbit larger masses.
Empyraea have the appearance of landmasses that have been sundered away from a larger mass with their undersides having low-hanging rent earth. The landscapes and ecology of each land mass varies from one to the next. As with most other lands of Yllithien, vegetation flourishes on both the surface and the underside of an empyra.