Rainbow Dash becomes a master magic-eating vampire, forms her pack, and works on managing magic with her new role. Friends help out of course. It's actually kinda awesome, all things considered.
Upon discussing and deciding on retirement, Princess Celestia and Princess Luna are caught off guard by the answers to their offer extended to Twilight Sparkle for ruling Equestria. This story has three different endings.
Rainbow Dash lost control of her vampire power five hundred years ago, and she's never been the same mare since. Numerous ponies find themselves caught in the web of this vindictive killer's game.