Creepy Survival modpack is mixing Adventure and horror mods.

1.This mod pack creates immersion and a horror challenge that combines horror elements.
2.Each day is a new challenge, with the included shader packs adding more atmosphere through shadows and various atmospheres.
3.The pack includes various creepypastas. 

4.Herobrine and his brother will continue to stalk and observe you as you attempt to survive another day in a cursed world where everything around you can become a nightmare.

It's up to you whether you will face the nightmare with your sword or flee in terror, trying to hide.