Of or pertaining to Hades: as, Hadean realms.

adjective. of or relating to or characteristic of Hades or Tartarus

noun. the earliest eon in the history of the Earth from the first accretion of planetary material (around 4,600 million years ago) until the date of the oldest known rocks (about 3,800 million years ago); no evidence of life

"The reduplicated angānga is used to designate the soul as distinct from the body, and which at death was supposed to go away from the body and proceed to the hadean regions under the ocean, which they called Pulotu."

infernal  

aeon  eon