Wikipedia
Chthon, chthonian or chthonic may refer to:
Chthon is a fictional character, a demonic Elder God appearing in American comic books published by Marvel Comics. His name derives from chthon, the Greek word for "earth" and "earthly", especially pertaining to earth that was not life giving soil, but dark like that of the grave or the underworld. In some instances, Chthon is portrayed as the Marvel equivalent of the primal Devil of some kind predating that of Judeo-Christian teachings, as his creations, the N'Garai, were driven from Earth by the angel Lucifer before his rebellion against God.
Chthon is a science fiction novel by Piers Anthony, originally released in 1967. It was Anthony's first published novel, and was nominated for both the Nebula Award for Best Novel in 1967 and the Hugo Award for Best Novel in 1968.
Its sequel is Phthor and two additional novels in the series were written by Charles Platt: Plasm and Soma.