Chthonic

Of the earth and the underworld (Greek chthon, earth), as opposed to Olympian — Hades "who dwells under the earth" and Persephone who rules the dead with him in the Odyssey; used by Pausanias as a cult title, "Demeter Chthonia (of the Lower World)", and by Plutarch of Anubis as "a deity of the lower world as well as a god of Olympus". Hesiod's Hecate, often called chthonic, holds a share of earth, sea and heaven.