Astarte, to my knowledge is never mentioned nor brought up. The Void dragon is mentioned in passing in a book as are the two Source Hunters from Original Sin 1. The Role of The Divine now it seems is to stop the Void and The God King from enslaving everything so the God's can continue feeding on their Worshippers. Some Demons from Nemesis are present in the game and some can be talked to, but Damian is MIA which, him being the reincarnated Chaos Demon and quite a threat is extremely odd. The entire game seems to treat Damian as if he is actually dead. Lucian barely mentions him when you speak to him except to say that not killing him when he was a baby was a mistake.