Talk:Episodes, films, and shorts/@comment-24145509-20140330184249/@comment-26973802-20140330203602

There is clearly a pattern. Rarity, Rainbow Dash, Pinkie Pie, Fluttershy, and Applejack began to turn away from their Element of Harmony, but when they realized what the right decision was, a rainbow light was reflected in their eyes. After making the decision, somepony they taught their Element of Harmony to gives them an item which has a rainbow shimmer (of the colors of all the Mane 6) at the end of the episode.

I don't know if they're trying to be subtle or not but these items have to be the keys for the box. Twilight's the only one who doesn't have hers yet and probably in the final she will get it and the items will turn into keys and unlock the box enabling the Mane 6 to transform into a "Rainbow Power" mode so whenever a new villain attacks they can use the rainbow to blast him/her into oblivion.