Nicomund The Red is who Kratos eventually becomes after God of War Ragnarök
This would explain Nicomund's unaging immortality, subconcious propensity to alcoholism and vulgarity, and his formidable skills as a warrior. It was an unspecified number of centuries that Kratos spent in Iceland after the reviled God of War left Greece in shame for his war crimes before he started to change for the better, and no doubt he still had a long way to go even after saving the Nine Realms from Ragnarok to becoming a truly good person. In the centuries that followed, as belief and memories of the Greek Gods he slew dissapeared, the ashes of his murdered wife-and-daughter Lassandra and Calliope, as well the red sigils tattooed in memory for failing his brother Deimos finally faded. So too did the might of being born the son of Zeus eventually fade, leaving only his longevity. Adopting the mantle of Santa The God of Hope, Kratos takes the mortal name of Nicomund and Norse Tatoos to honor and embrace his new Icelandic Heritage, marries for a third time to a Christian Shieldmaiden that who became Mrs Claus (and possibly converting to her religion), finally laying down his past as The Ghost of Sparta and finding peace.The Lightstones are an Expy of the family behind Blackwater/Academi/Constellis
With some adjustments to make them more palatable and suitable for the purposes of the story.