After being unable to for so long, Naofumi finally gets to upgrade his party's classes. He then takes part in a meeting of the Four Cardinal Heroes, held under the guise of a celebratory banquet. There, he learns of the existence of a bonus stage, with increased XP earnings. Meanwhile, Raphtalia gets into a fight at the party.
So if you develop weapons 
that are more rare...
...لذا إذا طوّرت أسلحةً أكثر ندرة
Wenn man also mit
sehr seltenen Waffen trainiert …
Si mejoras una más rara…
Si mejoras una más rara…
Donc, si tu en améliores
une très rare…
Quindi, se ne potenzi una parecchio rara...
Então se você treinar
com armas mais raras...
Поэтому, если прокачивать редкое оружие…