Fina discovers that her current iron knife can't cut through the tough fur of the black tiger and Yuna takes her to get a stronger replacement. However, Yuna finds out about the existence of mithril at the blacksmith's and begins a quest to obtain it!
There's no way an iron knife 
would work on something like that.
.محال أن ينفعك سكين حديدي في ذلك
Mit einem Eisenmesser wird daraus nichts.
Sí, no podrán con un cuchillo de hierro.
Sí, con un cuchillo de hierro no basta.
Vous n’arriverez à rien avec du fer.
Il vous faut de l’acier.
Beh, con un coltello di ferro
non ci si può far nulla.
Да, железный нож тут не подойдёт.