Pendle Hill is a true Open-World survival horror game. Different locations of the map are host to unique monstrosities. One of the locations is the Dead Forest.
The Dead Forest is host to The Invisibles - monsters in agony that cannot be seen with the naked eye. All you can see is their faded silhouettes and hear their cries. You do not stand a chance of fighting these monsters, however if you expose these monsters to a special camera and capture their photo, you can set them free!