My Little Pony: Friendship is Magic - Elements of Harmony... again...

I'm convinced that Chrysalis was also feeding off of Celestia's emotions: Her love and defensiveness of her subjects, as well as her anger at the threat.

well remember, Celestia used to have the Elements herself, and i think they contain a lot of her magical power, kinda like the Triforce. since the Elements now manifest themselves in the mane 6, they're the ones who can unlock it's potential.