Here's the sage's son au lore:
Back when Shadow Milk had not been corrupted yet, and just found out the truth of the witches, cookie kind, and the world.
From that despair the light split from his soul and that light turned into Pure Vanilla.
Shadow Milk suppressed his pain in order to raise this child and protect his loved ones. He had help raising the child from the beasts and Elder Faerie who he had been married too.
Tho eventually he and beasts all still became corrupted, he and Elder Faeri 'split', not truly divorced since faeries mate for life.
With what little sanity Shadow Milk hat left, he put pure vanilla in a deep ageless sleep, took his memories of everything exept his name and hid him away. Because then he was still somewhat sound of mind he didn't want his son to be exposed to the destruction that was coming and didn't want him to change from that sweet kind boy he is, into something dark.
Eons later when the beasts were sealed, Pure Vanilla was found by and old lady named Gooseberry who owned an orphanage and took care of him. Pure Vanilla doesn't remember anything from his past other than his name. And yet he feels like something is missing, or more like someone, and finds a strange comfort in the shades of blue. What he doesn't notice, is the blue eyes following him anywhere he went.