Im just unsure because in the wiki i says you meet the owner at the plaza after you finish the darkwood forest and drink a potion for the first time, but im long past that point. Im level 18.
I already pointed out: the library contains the necessary information, because Celica must develop her skills, increase her mastery level, befriend others and help increase the level of her friends and trusted bodies. Without this, the plot will slow down and Deimus wrote excellent books for beginners, thanks to them I myself understood how to optimally complete the game. But some players ignore such advice and continue to stumble.