Charlottes
And here I was hoping for something unique...but from this idiot and doormat MC, I guess it's expected. Why doesn't he reveal his power and has to hide his children's existence. He's already almost omnipotent in the fate verse with very few exceptions that in no way would care if he pressures his clan elders...
Author can't he buy the authority of balor aka his mystic eyes that actualizes death upon glare and create storms on one's focal point of vision and become a modern divine spirit. He already has one authority so what if he gets a few more. Have him buy the authority of several death related deities.