i thought the leaders of the chaos peepz were the darkness, so this might mean the 'the fury' and 'the darkness' are just generals that work for a higher chaos boss, maybe a lvl 30. Ohhh maybe that will be what the 3rd chapter is about, the origin of the chaos or even about fighting them in an entier continent. "you have met them before, the choas, the fury, the darkness, now you shall see what truly contorls them, now you shall meet fear itself, now you shall meet..."
