Welp, that vision makes abundantly clear that - despite the silhouetting and censored text - the origin of this curse is his Father (given the mother says baby Ronan looks like him). The reaction to the family is interesting... I wonder if he was a part of the secret evil organization?
Seems likely that the curses attempt to limit the MCs power, but even with 10 uber curses his physical strength is unmatched. I'm guessing these curses will slowly be shed (since the professor said she ran out of mana after just one) and used to power up the MC and reveal some nugget of info.
Or they might just do a curse breaking arc and hit them all in one go, but that seems too predictable.