More My Little Pony fanfic:

I'm afraid, and this one, well, this one gets down into the weeds, as they say.

It extrapolates upon information given in the two-part, second season opening episode, "The Return of Harmony" as well as the historical play the ponies put on during the episode entitled "Hearth's Warming Eve." Add in a strange revelation from a Hasbro toy display that there's apparently a third winged unicorn princess named Cadence who hasn't actually appeared in the cartoon, and the stewpot I call my head threw together the following.

This is Part 1. Part 2 is the conclusion.