Tartarus

Tartarus is an area beneath Hell and the Abyss, where Satan and his demons banished Pluto after having defeated the original watchers. Tartarus is being described as being as far below Hell as Earth is below Heaven.

Trivia

• In Greek mythology, Tartarus is the area of the underworld where the Titans and souls of the wicked are being kept.
• Tartarus is mentioned in the New Testament (2 Peter 2:4), where fallen angels (implied to be the same ones as in the Book of Enoch) are kept due to their sins during the "days of Noah".