I had just found the water crystal and walked into one of the buildings and found A fear crystal can anyone explain to me what is is/what it does

i dont know but i think it does nothing yet

I don't know what they are going to do, I don't think they do anything yet. There are 4 total, they aren't very hidden. I've tried burning them, putting them in my face, putting them on my bed, giving them to the golem, putting them on the mirror, having them touch eachother, nothing happens.