“What is your purpose here? I don't know why you would attack us.”
Raeth (also sometimes known as Raith or Reis) is the boss of Chapter 15: The Dragon Girl in Fire Emblem: The Binding Blade. According to the in-game dialogue, he is a General in Bern's Army. Raeth is charged with defending a small fort on the Etrurian border, where Fae is imprisoned.
“It's that girl, isn't it...? She isn't human... Why...do you seek her...? To use her power...? Gah...”
—Raeth's death quote in The Binding Blade.