Aornos in ancient Greece was a nekuomanteion — a place to go to consult the dead. Later Latin descendants (pun not fully intended!) of the word added the familiar ‘r’ we now recognize in constructions like ‘necro-’. On the west coast of Italy was another, perhaps more famous nekuomanteion featured in the sixth book of Virgil's Aeneid. It was called Avernus.
— Avalon Brantley