Stranger Things

You can easily turn Minecraft into a horror without creating complex adventure maps or scripts—just install Stranger Things. The build introduces many new monsters that will populate the block world and scare you at night in forests. Features the Upside Down dimension with demonic creatures: Demonic Bat (14 HP, 3 damage, medium speed, flies), Demonic Dog (89 HP, 11 damage, medium speed), Demonic Gorgon (108 HP, 13 damage, 0.25 speed, loud), and Mind Flayer (463 HP, 21 damage, applies blindness for 10 seconds, 0.23 speed). Don't forget to enable Experimental Options in map settings.