At the end of the party to welcome Celestia’s prized pupil and protege; Twilight Sparkle to Ponyville, we had gone to the Summer Sun celebration, when and where Princess Celestia was supposed to be.
The problem is; she never arrived. In her stead, her younger sister appears. Twisted by emotions, and a millennium in the Moon; bent on having her revenge through the eternal night, just as she had originally promised.
One can never permit a small detail, or a few to get in the way of party and fun; this is why I am here. I have a job to do and a purpose fulfill. I have a new friend to make, and I be damned if I fail her.