Helios is rather justified in his hatred ... Zeus made his hatred of Kratos known when he murdered him and laid waste to Kratos’ lands and killed him so that Kratos could never seek regicide ...

Kratos kills him with some timely assists from Gaia ... Titans and gods alike. Perses, Helios, Hercules, Hermes, Cronos, Hephaestus, and Hera all fall in battle against Kratos.