Chapter 1:
Chapter 1 seems to introduce Nozdormu to one of the newly-awakened dracthyr, and relates a brief version of the story of Dawn of the Aspects to them - how the Aspects started off as proto-dragons, fought Galakrond, and as a reward for vanquishing a threat to Azeroth were given the gift of evolution and became the progenitors of Azeroth's modern dragons.
Chapter 2:
Nozdormu transports Emberthal, the dracthyr warrior, back in time to witness crucial moments in the history of the Dragon Aspects. A cautionary tale of both corruption and sacrifice. Chapter 2 basically covers a brief history of Neltharion/Deathwing - including a look at his pre-corruption Visage form.
Chapter 3:
Having shown Emberthal the Dragon Aspects’ rise and fall, Nozdormu takes her on a final trip back through time… so that she may unlock the mysteries of her own past.
Feel free to discuss.