I did a reverse image search on google, and this is what came up https://www.google.com/search?q=darkness&source=lnms&sa=X&ved=0ahUKEwiLuKzV19LbAhUGObwKHe6aA2sQ_AUICSgA&biw=1366&bih=635&dpr=1
DARKNESS. And if you click on 'images', just look at the 'related images'. Super creepy.