A very powerful, seemingly completely orchestral piece, this is. Probably the most fear-invoking track on the entire site, not to mention the project that this track is a part of.
There's a bit of repetition to the main pulse, but all that does is add to the suspense, and at the points where the music gets going, I can almost see a conflict between a hero, or a small group of soldiers, fighting something they can't see, hear, or understand.
The last part, the piano solo, seems to me to be a quiet respite, as our heroes calm down, or survey the carnage they're due to witness. Possibly a couple have died to the attack. Then, finally, when their guard is down, the enemy returns for one last go... and that's all we see of them.
Maybe this isn't a moving piece, but it invokes plenty of emotion, anyway.