Children of the Night.

The world is full of stories. They begin and end with a word.

If, for example, a pair of thieves claimed they could smelt metal that was invisible to those who were stupid or unfit for their job, came to a princess, then you have the story of The Princess With No Crown. But if you look again, it is also the story of The Filly Who Spoke Out Loudly And Was Taken By Her Mother And Given A Good Beating, or the story of The Whole Crowd Who Were Rounded Up And Told, Look, This Didn't Happen, OK?

This story is told by the Weaver, an alicorn so old that her name was lost to the ages.

This story begins with a word. The word was

NIGHT