They are always there

This is a modpack based only for horror. You will need to install shaders for this since it does not consist of any shaders, only resource packs.

Most of these entities will come out at night so be prepared.

The Cave Dweller Spawns in deep caves and will randomly jump out and try to kill you.

The Weeping Angles randomly spawns anywhere. Make sure to keep direct eye contact. If you do not it will start to nudge closer to you. If it touches you, you will be sent to somewhere random.

The Man From The Fog will only come out at night and in caves. It behaves just like the Cave Dweller do not look at it.

From The Fog adds randomly generated structures and also herobrine. Herobrine can appear in many different forms. 

The John has three stages, baby, teen, and adult. He almost can one shot you so be careful.

All of the other mods just make the game better.