At the very top of the list of all things to be afraid of is invisibility.
Invisibility alone can be enough to create as much terror as monsters or monsters. Anything-er, such as, giant rabbits.
But the creature in the story below draws his power from a much more removed source -- the power of being unseen and unheard. And he plays in the shadows with a very particular type of power: sound, the creation and destruction of sound. In the 50e0806aeb birkar