Plane of Earth

A great and rocky shell situated between the Plane of Fire and the Plane of Water, the Plane of Earth is far from an endless solid expanse. It is riddled with great caverns and cave systems, excavated artificial vaults, vast crystalline geodes, and underground oceans and springs of magma where it borders its neighbors. Untold riches in gemstones and veins of precious metal make it an attractive destination for planar travelers willing to risk the wrath of the elementals and genies who resent the plunder of their home.

Travelers arriving on an earth plane risk suffocation if they cannot reach a cavern or air pocket, and a creature who cannot burrow is entombed in the plane's substance until it digs its way out. Air creatures are ill at ease here, rarely having room to move freely. While elementals have little organized society, a genie empire rules much of the plane from a rainbow-lit city inside a geode cavern thirty miles across.