Here is a in-depth tutorial on how to make a horror environment in Blender.
In this tutorial, you will learn how to create a real-time horror environment using EEVEE render engine. This Blender tutorial will start from modeling the 3D scene from scratch to fully texturing and rendering the final scene using royalty free textures and assets which are available to download for free.
I liked the atmosphere.
It's Cthulhu coming out of the locker room.