I hover out there in darkness unseen.
I will shred things in pieces 'til they are just smithreens.
I might share a gateway to places unspoken,
Yet I'm sealed off to man, forever unbroken.
I twist and distort, only darkness escapes,
I destroy all I find
Whatever I take.

Who or what is the "I" referred to in the riddle? Provide adequate reasoning for your answer.