I noticed that since Kratos saved Deimos in God of War: Ghost of Sparta and then Deimos was killed by Thanatos, his soul might have went to the Underworld.
Since Kratos killed Hades, Deimos' soul might have escaped the dead, and then saved his brother. Also, it could be that Kratos is saved by his whole family: Callisto, Calliope, Lysandra A.K.A. his wife, and Deimos.
afterlife in this game is just so random i cant make a guess die forever, go to hell, getting out of hell, being in the river, turned in to some wierd mystic thing, going to hell then dying. idk lol
interesting idea, I don't know how this would play out though. Kratos getting saved, but then what? him and his family are all fine and dandy now? GOW's story has been about a man and his suffering because of what he has done and seeking revenge, what would be his drive if they were to make a new game?