Well you could check out the Opera it is actually from,

Carmina Burana.

You may also like Woflgang Amadeus Mozart's Requiem, not as evil sounding, but very epic, and very powerful.

Beethoven's 5th, has slight similarities, in feel, well the first movement does.

Franz Schubert's Unfinished symphony has some great, dark parts to it.

You might like to check out osme film soundtracks also, for that epic feel.
thanks i'll be sure to check them out, im mostly looking for that vocal sound they have, thats awesome stuff