Thread:SonictheHedgehog1245/@comment-26897822-20171006193239/@comment-24908786-20171011141053

I believe that Twilight discussed with Star Swirl her concern about the Tree's fate should they take the Elements again to use against the Pony of Shadows. In the end, the Elements survive, and I'm pretty sure they returned them to the Tree to ensure its own magic remained intact so something like Discord's Plunder Vines could not threaten it again.