Wonderland Modpack 

But in this case way scarier like GENUINELY If used with the shaders.

I added another mainish horror mod that is more psychological and has its entities also. They pair well together and don't mess up with each other.

Lastly a horror ambience mod that adds spooky sounds or jolting auditory ques and isn't over playing them.

This modpack was tested and for a quick rundown:

It starts off small, you'll see or hear things to get you on your guard BUT then after an hour...all I can say is good luck.

USE THE SHADERS HIGHLY RECOMMENDED