They can be pretty hard to fight since they sometimes disappear and reappear somewhere else but it's not too bad! As long as you keep your flashlight on them when they're nearby you can see them and hit them. If you don't they become invisible and you can't hit them but they can attack you still.
I have a special stone that makes them always stand out when I'm close to them, even if my flashlight isn't on them.
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I have a special stone that makes them always stand out when I'm close to them, even if my flashlight isn't on them.