Cadance became an Alicorn after defeating a mighty foe with Love. Twilight became an Alicorn after completing a spell with Friendship. Rainbow Dash is the first pony to create a Rainboom.
Nothing to see here folks just another lousy fic combining alicorn ascension, divine parentage, and the fallout one of the episode we just don’t talk about aka Mare Do Well.
After seeing what happened when she accidently changed her friends destinies, Twilight is curious about about the 'what if'. Like, for example, what if Luna had ponies a thousand years ago who noticed her.