Talk:Episodes, films, and shorts/@comment-27214641-20160907162229/@comment-1031724-20160908002137

If it wasn't for the fact that they used the Crystal Heart to stop the snowstorm in The Crystalling, in a basic less-satisfying repeat of Sombra's... defeat... I'd say they'd use the Crystal Heart on Chrysalis, since it'll most likely be set in the Crystal Empire.

Then again, we've also seen Rainbow Power a second time, though only in Luna's dream when they used it on Nightmare Moon, and we're not 100% sure it can be used again, but I think it should be, because what if there are more villains like Tirek (we know there's one in the movie, and there's speculation that Chrysalis is still out there and that Grogar is too), besides, what Mega Sean said

I hope one of them is used to defeat whoever the villain there is, if there is one, but two-part finales have always had one (two-part premiers seem to avoid them starting from Season 4, unless you count Plunderseeds or their creator)