Chthonian

[Sarah]

Designating, or pertaining to, gods or spirits of theunderworld; esp., relating to the underworld gods of the Greeks,whose worship is widely considered as more primitive in form thanthat of the Olympian gods. The characteristics of chthonian worshipare propitiatory and magical rites and generalized or euphemisticnames of the deities, which are supposed to have been primarilyghosts.