Fear.

What is fear?

At its most basic level, it is the flight in "fight or flight."

It is caused by neurons firing in the amygdala of your brain in response to some stimuli found threatening.

Fear is things nesting in dark corners, shifting, coiling. Fear is born unto darkness. It keeps you awake. It torments your dreams and your waking life. Fear can be power and fear can be weakness.

Fear is powerlessness when those dark things come to haunt you at night. Awake or dreaming, they are there in the darkest regions of your room. Why do they only come out at night?