Awesome, literally.
This is a truly amazing piece of work, so much so that I actually felt the need to submit a review (a first for me, on Newgrounds). I love the bassline in this. It gives the music a sense of desperation and urgency (exactly what you need in a boss battle).
I can totally see this being used in a big name RPG. To me, it's up to the standard of Nobuo Uematsu. Hell, if I heard that he composed this, I wouldn't be surprised (although it's not really his style).
Well, I guess that's it. I can't really think of anything negative to say; it's that good. I've listened to the other Rose tracks, and I can honestly say that this is the best out of them (except I'm a bit biased towards this orchestral style). I'm glad that my first review on Newgrounds is one so positive.
PS It's nice to see that Lost Odyssey isn't completely lost.