Unknown

In your aimless search for knowledge, you find yourself in a place unknown to you. And yet it seems achingly familiar. You get the feeling you should search for this knowledge elsewhere - or better yet, stop seeking it altogether.   Maybe - if you are truly lost - you could find your way to the Library of the Lost, where such insight could surely be obtained.   .
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  Despite your better judgement, you continue searching.   Dimly, you hear the voices of people long forgotten. They blend and amalgamate into one voice, and if you listen closely, it almost sounds like your own. Almost. There is something ever so slightly off about it that you cannot quite put your finger on.   The voice, your voice, speaks to you. 'You are not supposed to be here.' It says. Maybe you should turn back after all.   .
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  You ignore the ever-growing sinking in feeling in your stomach. It has lead you astray before. Focusing on the voice a bit too much, a body starts forming where the voice seems to originate from. Startled, you notice that the body is forming from your shadow. It looks like a shadowy silhouette of yourself.   'You are not supposed to be here.' It repeats. Despite its lack of facial features, you get a distinct impression that it is smiling. It is not a nice smile.   Involuntarily, you shudder. You miss the warmth of your home. There is still time to turn around and leave this place.   .
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CW: slight body horror
You have come this far, you might as well continue. After all, what is the worst that could happen? You open your mouth, to say as much, to ask it about the location of whatever you were searching for but find yourself unable to speak. Raising your hands to your throat, you notice that you are starting to look oddly shadowy.   'You are not supposed to be here.' It says again. This time it feels different. Final.   You notice that your shadow now wears your features... Except that its mouth opens wider than it should, splitting your face from the forehead all the down your throat, exposing multiple rows of razor-sharp teeth.   You want to scream, to run away but find yourself rooted in place. Unable to move a single muscle. Panic sets in as you realise you cannot even breathe or blink.   You feel an ethereal hand gently caressing your cheek. The last thing you see before you lose consciousness is your former shadow leaning down, as if for a kiss. Only its maw is wide open.
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  You wake with a smile. Finally. It has been too long since you have had a body. And this one seems particularly fun to play around with for a while...
Spooktober
Prompt 30: Shadow
Type
Void