Battle ambience
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One thing I always noticed about battles is that the sound doesn't seem quite "atmospheric" enough.
I found a good channel which deals in ambient background soundtracks. They can be emailed to get the downloads of the audio for uses like this
Here are just a few:
https://youtu.be/0QmA_-uxaDE
https://youtu.be/Wo3D2I4jdL4
https://youtu.be/byomVAJNT_8
https://youtu.be/U217ClVe3D8Since these are fairly non-intrusive, in-game they could start at a random point with a fade in-effect, and leave the current audio effects in game with these sounds playing more quietly in the background.