In Greek mythology, Tartaros (also
Tartarus) is both a deity and a place in the underworld even lower than Hades. In ancient orphic sources and in the mystery schools Tartaros is also the unbounded first-existing "thing" from which the
Light and the
cosmos is born.
2 Peter
2:4: "God did not hold back from punishing the angels that sinned, but, by throwing them into Tartaros, delivered them into pits of
dense darkness to be reserved for judgement."