I'm not sure if this is a bug or I'm missing something, But I have a quest to beat 10 on the battlefield and there are only 9 enemies. I've switched realms numerous times and constantly gone back and forth to see if something else would reappear, I even raised all the flags because I heard some boss comes out if you do-nothing. It's a dungeon so I really don't want to start all over again. (also about half the times I try to switch realms it keeps saying I can't 'in this location' even though I am in my dorm.)
Actually, the secret boss only comes out if you raise all of the flag poles. When that's done, he will appear and walk around in the field during the battlefield fight quest. He's a fire boss, and his minion is whatever enemy actually joins the battle.