If you have heard of Midnight Syndicate then you know what Nox Arcana is all about- “imaginary soundtracks” of a gothic horror nature (for the most part). Music production seems to be entirely based on keyboard midi and other sampled instruments, which is in my opinion the one shortcoming of their music (I think the music would be significantly better if it were performed by real instruments, because, let’s face it, while production quality has gotten much better, you can often tell the difference and it makes the music sound a little cheap or cheesy.) Nox Arcana started around the time that Midnight Syndicates production improved a bit, meaning that while this is their earliest album it doesn’t suffer from the problems of Midnight Syndicate’s earliest albums.
Darklore Manor is a decent album, and would be a great stand-by for filler music if you are running a gothic horror Ravenloft-type of game. If you are looking for higher quality music along a similar theme I highly recommend the soundtrack to The Shining, which is about another haunted mansion.