Confirmed in the game files, this music was composed by Neal Acree! It listed him as the contributing artist in the mp3 metadata for the pre-cutscene file.
Even though this video is only 34 seconds long, it is a little complicated how this was put together, so here we go...
So basically there's a "pre-cutscene" portion that plays in-game after you defeat Fyrakk, which is what you see at the beginning of the video. That pre-cutscene part has the music file separated, and the file has metadata (with Neal Acree credited in that metadata).
The second part is the actual cutscene itself that shows all the aspects being empowered by Amirdrassil. Unfortunately, the sound effects aren't separated out in that part. Both the music and sound effects are baked together in the file for that cutscene.
So yeah, I pretty much had to take these two parts and merge them together to create one continuous song. And for the most part, it works. Sadly, only the first 7 seconds is 100% music. The other 27 seconds has sound effects baked in. Ah well, this is as good as we're gonna get it at the moment. I'll take it!
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