Ritual Inside the Nekromanteion by Marc Jailloux, 2011.
The Nekromanteion was an oracular temple on the Acheron River near the ancient city of Ephyra. Dating to
the 3rd or 4th century BCE, it was dedicated to Hades and Persephone.
Sotirios Dakaris, excavator of the site, reconstructed the experience of the seeker as involving an incubation, during which the supplicant followed a diet that included broad beans, found in quantities at the site and known to possess hallucinogenic properties when consumed in their green state. Following a sacrificial offering, the supplicant traversed a labyrinth, causing a sensation of disorientation,
prior to entering the chamber of the oracle. Archaeologists have discovered mechanical devices inside the subterranean chamber which may have been used to enhance the appearance of the spirits of the dead.