Who Could I be?

Who am I?

I am the one who is never seen,

I am the one who hides away,

I am the one who has never been,

I am the one who is not kept at bay. 

I am the one that loses its mind,

I am the one that has no relation, 

I am the one that you can never find,

I am the one that feeds exploitation.

I am the one as dark as night,

I am the one as changing as sea,

I am the one as fierce as a bite,

I am the one as strong as a tree.

I am the one seen in forests,

I am the one seen at murders,

I am the one seen as a chorus,

I am the one seen giving the orders.

I am the one who is the master,

I am the one that loses control,

I am the one as haunting as spirits,

I am the one seen as the murderers puppeteer. 

So again... who am I?