Lore question about the numen

So iv been trying to find out if the numen are originally from the land of shadow and where always oppressed by the hornsent or have a place they used to live before that, came to the land of shadow and where immediately tortured and kill by the hornsent for there lack of horns? I can't seem to find any answers or good speculations. Any answers or lore info would be appreciated as i am very curious to know whether marika would have really had an irish accent since that seems to be the native land of shadow accent