The entirety of the Nightwish Album, because the music is fantasy or based on mythological stories. They're Symphonic metal so you might like them.
Another would be Yuki Kajura, specifically the Kara no Kyoukai OST. each track is listed as [M1, M2, M3, etc] I recommend trying M17 + M18 for specifics.
Anything by Nihon Falcom JDK.
Lastly, going to throw Two Steps from Hell out there, as overused as their music is; it's pretty damned powerful.