Lithosphere is a dwarf demon from Plane. He was first mentioned in Vale of the Vole.
Lithosphere is in charge of keeping track of the rocks and continental plates of Earth, so he created Pangaea. He fell to sleep, and Pangaea broke apart. Earth blasted him to a thousand pieces, and those pieces fell onto Xanth and created the creatures there. He lost a game with Xanth and was forced to meld his world with Xanth, underneath. He is also known as Litho.
Novels: Vale of the Vole, Currant Events, Stork Naked, Well-Tempered Clavicle