"The underworld is the world of the dead in various religious traditions, located below the world of the living. Chthonic is the technical adjective for things ...
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of the underworld.
The concept of an underworld is found in almost every civilization and "may be as old as humanity itself". Common features of underworld myths are accounts of living people making journeys to the underworld, often for some heroic purpose. Other myths reinforce traditions that entrance of souls to the underworld requires a proper observation of ceremony, such as the ancient Greek story of the recently dead Patroclus haunting Achilles until his body could be properly buried for this purpose. Persons having social status were dressed and equipped in order to better navigate the underworld." - (en.wikipedia.org 11.03.2020)
