The Elements of Fate

With Canterlot and the rest of Equestria over run with changelings, the princesses of the sun and moon have been forced to take shelter in a library in Ponyville, the last safe haven in Equestria. The princesses have only one hope left in all of Equestria. Twilight Sparkle and the Elements of Harmony.
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In a dusty, old room no bigger than the average bedroom stood two horned pegasi. One larger with a coat as white as snow with a translucent rainbow mane, and the smaller one a midnight blue with a matching translucent mane. Their perfect, regal posture contradicted the state of the room they were in quite nicely. Bookshelves and scientific gizmos lined the walls of dirt. The two alicorns stood behind a desk of polished wood.

“Sister, do you think we will ever be able to save our people?” The smaller one asked.

“Luna. It is not our fate to save them. It is Twilight's,” The larger one replied, in a kind yet commanding tone.

“But Tia, when will she be ready?” The one named Luna whined.

“Luna, I’ve told you many times, call me Celestia not Tia. As for Twilight, she is is almost ready, all she needs is a little extra push,” Celestia replied, with a hint of mischief in her voice.

“Tia, don’t tell me you’re thinking what I think you are thinking. She loves that dragon as much as life itself. You wouldn’t dare,”

“Just to see if she can handle heartbreak. Last time her heartbroke the entire world shook with her sadness. You remember don’t you? Her brother’s wedding?”

“How could I forget it? Her magic summoned a literal tidal wave which destroyed the entire castle. Better she destroyed it then those rotten changelings!”

“Also remember her parents she tried to bring them back to life, with terrible consequences,” Luna seemed to literally shudder at the memory, “if she can’t handle grief, she will never be able to free the world, from Discord and Chrysalis’ tyranny,”

“I now understand sister. I’m still not sure how you plan to have her save Equestria though,”

“Remember when we defeated Discord 1000 years ago?”

“Yes, I do... WAIT! You don’t plan for her to use the elements. Do you?”

“I do Luna,”

“But, the sheer power of the elements would destroy her,”

“Oh, sister. I don’t plan for her to use them alone,” Celestia giggled.

“Sometimes I think you know too much for your own good, sister.”