La Louvre
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I managed to win against the gnome on my first try, although I lost almost my entire army. But I understand that he won't fight Biara, so it doesn't really matter. However, I'm having trouble with Frida. But I re-leveled her, gave her Divine Vengeance, fully upgraded Dark Magic (with Berserker and Mind Control) + bought Vampirism and Luck (because I almost always had bad luck in attacks). All that's left is to replay the 3rd mission and see what happens.