Sunset had been initially confused by the unexpected delivery through the portal - unexpected enough that it had been left in the middle of the school's front walk for two hours and had only gotten to her because the attached note read SUNSET SHIMMER on it in large red letters.
Fortunately, the contents of the note had explained things well enough. Starlight had obviously been under a lot of stress when she wrote it, but she and Sunset were on similar enough wavelengths that the essentials had gotten across.
So sitting at her desk, Sunset looked at the scroll and pondered. Unrestricted time travel had been a myth while Sunset was in Equestria. Holding something that would not only allow it, but could be used almost effortlessly by anyone who wanted to? It was an incredible amount of power.
With something like that, a person was only limited by their imagination. They could change history to gain untold amounts of wealth. Influence. Power. Perhaps even enough to become a Princ–
"Nope." Sunset flicked her lighter, setting a corner of the scroll ablaze. "Absolutely not."