the lost skill book in the hidden cave

you are a young peasant , a farmers child. your life has been complicated since the horse got sick, leaving only one for the farm. in this country only nobles are allowed to learn magic, a fact that is not lost on your poor community where only the kind priestess, lady Marin can heal. she is kind, but is a illegitimate child of a noble with very little mana, but she tries to help. your life is about to change though as you get lost one day in the rain and take refuge in the cave and find a skill book. What ability will it grant you? note:this is a low effort seed, i dont really know the witchcraft of coding like some...anyway enjoy!