Erebus
EREBUS, in Greek mythology, son (according to Hesiod, Theog. 123) of Chaos, and father of Aether (upper air) and Hemera (day) by his sister Nyx (night). The word, which signifies darkness, is in Homer the gloomy subterranean region through which the departed shades pass into Hades. The entrance to it was in the extreme west, on the borders of Ocean, in the mythical land of the Cimmerians. It is to be distinguished from Tartarus, the place of punishment for the wicked.
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)
