It is what most Earthly nations call the underworld, though it is no natural place for a human soul to come to rest. Heaven is the only place a soul should be - in The Darkness, they fuel demons' power and become twisted into their pawns. I have been there several times, venturing into its pits to gather the remains of Ishtar's first body, in which she imbued her prophecy.

[And then there was that other time where he jumped in to save a little girl even though he knew she was just being used as bait. No excuse not to save the innocent even if he knew it was a trap. But he's not going to talk about that.]