Maybe after the fall of the Olympians the Persians try to take over and expand there **bleep**. Kratos could go after them. We got to see a little bit of them in Chains of Olympus. I am pretty sure that Persians have a **bleep** load of mythos that Kratos can tear up. He could fight god-kings like Xerxes. Although he was human, they could give him powers and **bleep**.