Discord reflects on the Elements before they're ever used against him, in a nightmare mere moments before Celestia and Luna face the great villain.

I'll have forever, and yet, so many ponies do not, what I wouldn’t give to see the looks on their faces, those darn bearers of the elements, when they realize their salvation is really a curse disguised as a blessing…..

I’m afraid however, that Sweet dreams will fall upon them eternally before they have a chance to see for themselves. Oh, well, Tia and Lulu will be there, unless everything proves too much for them, but somepony will recognize what destruction I’ve noticed as of late, subtle changes in the fabric of reality every time those stones are used. If only they knew that now…