Maybe instead of increasing the running speed on the third one, let the song stay on when you are getting hit.
Sabotender Mazurka LV99
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Increases the Movement Speed of party members within the area of effect. Party members under effect will remain so even during enemy attacks.
I find that this would be useful in many ways just trying to escape some nasties that want to kill you. It may also add some interesting new tactical scenarios for battles.
Please add your thoughts (or a better name for the spell).