Side story of the Pony POV Series. The title says everything you need to know really: It's The Sirens verses Nightmare versions of the Mane Six in the 'Discord Wins' timeline, while our heroes watch, who wins? TAKE YOUR BETS! Written by Godzillawolf.
Point of view of Wallflower Blush's early years that made her who she is, and Sunset Shimmer's ordeal with her friends' good memories of her stolen, in the Pony POV Verse.
Pinkie Pie with one camera and a TV studio all to herself invites her friends over for antics that can't effect the outside world and sneak some peeks at alternate timelines. What fun will the ponies have when anything is possible?