From publisher blurb:
Those Who Forget Their History
The firstborn were not the first beings to emerge from the Mists. The dark — formless and insubstantial, untainted by Weaving — were its original inhabitants. Eons ago, the fae fought the dark for the right to determine the nature of the world. The fae won and imprisoned the dark for all eternity.
Are Doomed to Be Annihilated by It
Or so they thought. In victory, the fae grew complacent and indulged in their petty grievances. Few fae remain who remember the dark or the Sacred Oaths that lock them away. Now the dark return determined to enact their revenge against the fae.
Past is Prologue includes:
A new Origin — the dark, their courts, and their means of reentering the world.
A history of the Weaving War and details about the elusive Sacred Oaths.
The dark’s fearsome Dominion of Nightmare.
While Past is Prologue is a Dark Ages: Fae supplement, Changeling: The Dreaming 20th Anniversary Edition Storytellers may find the historical information of use to their chronicles.