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Someone asked: what to do if Duncan is better leveled than Frida? Answer: give Duncan the army and send him into battle. I did this with another pair. I gave the army, artifacts, and the tent to Gotay, who was leveled up to level 34. The quest is marked as completed.
They immediately attack the Dungeon castles, not allowing the opportunity to transfer troops. And even after the battle, the heroes are a blue ally, not your heroes.
Regarding Biara, she has not only the Amulet of Mastery but also the Ring of the Broken Spirit.