Okay first of all. Bad-ass. I think this is the first intensely dramatic song I've heard. It sounds like the soundtrack to an alien horror film. It's like I was fleeing from a xenomorph and fell into a mysterious hole, and in that hole I discovered some horrible truth.
I thought at first it wasn't going to fit very well with the theme. But later on in the sing, I think it does the best at capturing a 'crystal' vibe.
The other half of this jam's theme - castle. I'm not really feeling a vibe in that area. If you included cello, violin, strings, or something like that you could've captured the other half of the theme. Around 3:00 there's like this (flute?) but it sounds more Japanese then anything castle-royal.