This trailer for God of War: Ascension shows off the primary enemies that Kratos will be faced with in this prequel of the series. They are three dieties referred to as the Furies, they possess a contract which connects Kratos to Ares, and they are hunting him down for breaking the contract.
The Furies are “bound to Hell” (the developers may decide to throw in Valhalla at some point as well. Why not?) and they go after anybody who they have “deemed guilty.” Only the death of Kratos will satisfy their desire for justice, but since this is a prequel, we already know what’s not going to happen to Kratos in this game.