Celestia is the Goddess-Princess of Equestria. But, as we've seen, other alicorns, like Cadance and Twilight, age. How is it that only Celestia is able to...remain? What is it that ensures her survival, to govern the ponies of the next age? Where did Celestia's mortality go? And why does a certain pony look so similar to her?

Credit for the cover art goes to http://ibrakefordragons.tumblr.com/post/36152525364/arcane-my-little-pony-circles