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End the battle is too strong on an offensive card. Even without an interrupt attached I would be very wary of putting that mechanic on a good card. Ending the battle is stronger than other battle winners because it immediately goes to battle resolution and thus a redeemed soul. This card effectively says "Rescue a Lost Soul. Cannot be interrupted."
Here's a revamped version. I wanted an enh involving music to be able to be used on CoW Moses as there are only one or two that can be used on him. I considered making it CBI if used by a hero involving music instead but felt that might be a bit too strong. And Moses wouldn't be able to use it (unless he's banded into battle).