Hello!
I GM a game with some friends and we use Syrinscape. We are currently running Curse of Strahd and I just wanted to recommend that you guys check out the In Search of Sanity soundpacks that just came out recently. They are great for this kind of campaign, all sorts of spookyness and a very serious fantasy-horror tone throughout that reinforces the Ravenloft campaign setting quite well.
There are also “tension levels” that you can go to. Perfect for a dungeon or creepy exploration as the players get closer to their goal, you can amp up the intensity.
I’d highly recommend taking a listen to this soundpack if you are looking to up the intensity of your fantasy-horror game.
Well done Syrinscape!