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Yes, there are too many mini-arts at the beginning! Just put one on the Inc, one on the Gremlins, and that’s enough. As for the damage, you put a bow, a quiver, a mini-art for attack, luck, and initiative (on the Titans)... AND WHAT DO YOU THINK, THEIR DAMAGE IS BAD????
Added 2 minutes later
And since there are 3 archers in the army, with this combined art, the Academy units deal pretty good damage.