Kreng - Grimoire (2011)

Here is an excellent dark ambient release I discovered through Steven Wilson's playlist. It's perfect for a horror movie soundtrack with plenty of dissonant elements including ones taken from classical and jazz. It may not have the depth of Lustmord or Robert Rich's work (the two best in the genre as far as I'm concerned), but it's an amazing release nonetheless with plenty of drama and discomfort.
9/10