Lore

Back when Kratos was a young kid being around 15 with his younger brother Deimos who were both spartan soldiers under their mother Callisto. Deimos had been kidnapped by Ares (God of War) and Athena (God of Wisdom) because of a prophecy of a warrior taking down Olympus. This led to Deimos being tortured for years by Thanatos (God of Death). Later on Ares had commanded kratos to raid a village with an army which kratos didn't know his family was there and had killed them. With the death of his family he left his service with Ares and became the "The Ghost of Sparta", beacuse he was cursed with his dead families ashes making him white. He had nighmares and horrible thoughts about the situation so he served the Olympian gods to give him relief over his guilt. After Kratos had finaly saved Deimos they both faught Thanatos which had killed Deimos in the procces. With Deimos dead Kratos burried him and promised to make the gods pay for what they did to him.