Talk:The Crystalling - Part 2/@comment-26561304-20160308075124/@comment-10390252-20160308105334

It has was established back in The Crystal Empire that the Crystal Heart's power that makes the plain upon which the Crystal City is built habitable. If, for whatever reason, the Crystal Heart's power is failing, the City could be frozen over.

FWIW, I suspect that Starlight reconciling with Sunburst will restart the heart for whatever reason. It will be another reason for suspecting that Starlight is 'special' in some way that her heart rediscovering love will have such a massive effect.

I'll forgive the script writer if that second paragraph is at partly wrong and it is just an expression of true love in the Heart Chamber that does the effect - anypony's expression of true love. This means that, from now on, its it is happy fun time for Shiny and Cadance once every year in the Heart Chamber!