Fire Emblem: Three Houses finally released in my region. Upon starting a new game, I'm asked to choose between Normal and Hard difficulty, as well as Casual and Classic mode. And after that, I'm asked if I'd like to "connect to the internet and play online".
From what I understand, the newest installment of the Fire Emblem series is, as always, a single player experience. So what exactly do I get for playing online? What features are only available then? What will I miss if I don't connect?