Twilight rushed back into her library with her mind focused on an epiphany. She had the key to fixing Starswirl’s spell, she was just surprised that she hadn’t realized it before. She lifted the spellbook with her magic, turning to the page to where the original spell was. She took a quell, ready to rewrite the spell, and finally undo her mistake for good.
“From all of us together,” she said out loud as she wrote, “Together we are friends, with the marks of our destiny made one, there is magic without end.”
As soon as Twilight finished writing and placed the book back in its place, something in the air felt different, she felt a spark as if a new form of magic had been released. Her suspicions were quickly confirmed as light burst from the element crystal on her head. Both she and her friends were caught off guard as the elements began to operate on their own. One by one, each element crystal shot a beam of light at Twilight, who was now caught in a bubble of light.
Despite the sudden turn of events, somehow Twilight knew that this was merely the magic of friendship at work, operating in it's own mysterious ways. She knew that there was no fighting it, she didn’t even try; she just closed her eyes as the elements whisked her away from her current realm. Twilight opened her eyes after the blinding light faded out, finding her in an expansive cosmic realm made up of stars.
“Hello? Where am I?” She asked as she gained her footing on the surface made up of sparkling stars below. “What is this place?”
Twilight was relieved however to see a familiar face manifest and approach her from the cosmos. “Congratulations Twilight, I knew you could do it.”
“Princess? I don’t understand, what did I do?”
“Not only did you overcome your own internal struggles, but you did something today that’s never been done before.” Celestia lifted Starswirl’s spellbook with her magic, turning to the page of the spell that Twilight had rewritten. “Something that not even a great unicorn like Starswirl The Bearded was not able to do, because he did not understand friendship like you do.” Celestia sent the book away in a puff of magic, no longer having any need for it. “But that’s not all, you’ve also had the courage to look inside yourself and overcome your struggles and conflicts, from learning to let go of fear and judgment, to discovering who you are and becoming a better and stronger pony because of it”
Twilight was puzzled at first, but like a truly brilliant mind, it didn’t take long for her to put the pieces together. “That night when I came out.”
“That night, I was able to witness for myself how much you’ve improved. Your beginning to accept yourself for who you are, and thus learned how to help others overcome their internal struggles as well.”
“Well, I have great friends and a great teacher to help me along the way.”
Celestia smiled humbled by Twilight’s compliment. “Which is why I’m proud to do what I’m about to do. You’ve proven that you're ready Twilight.”
“Ready? Ready for what?” Twilight asked as Celestia began to lead Twilight down the path of stars laid in front of them.
As Celestia lead Twilight, she sang a beautiful ballad, praising Twilight for her accomplishments thus far, as screens floated by, displaying her greatest triumphs and deeds. Twilight was humbled watching her greatest achievements thus far and looking back on the memories being shown to her, along with the heartwarming, melodic song that Celestia sang to her, and the encouraging and humbling lyrics that came with it.
At the end of the starry path, Celestia flew upward in a powerfully majestic pose, her wings spread out wide and her head held high as she declared that it was time for Twilight to fulfill her destiny. A rushing collection of swirling lights surrounded Twilight, raising her upward as she felt an exhilarating amount of magic enter her body. In most cases, such a large dosage of magic would be dangerous for one pony to contain, but Twilight was absorbing it like it was nothing.
Along with this sudden rush of magic within her, she felt another feeling, a tingle on her back, a soft, feather-like sensation began to make itself present. Her hooves began to feel smaller, and less dense like the feeling of muscle tension released and softened. Her face felt lighter as well, her muzzle felt less heavy, and her cheeks began to soften, which began to make her feel light-headed. She felt the familiar sensation of her hair being combed as if it was being straightened out, but there was no brush above her head to speak of.
The strange feelings came to a stop, as her vision cleared out. She could see herself being slowly lowered back to the grounds of Ponyvile. Her friends stood still witnessing Twilight descend from whatever display of magic and light displayed in the sky above her. She finally landed softly on the ground, her knees weak as they still felt the aftermath of the magic cast upon her.
“Twilight?” Applejack asked squinting in hopes of getting a better view of what was going on, but all she could see was a silhouette of Twilight. But the silhouette seemed off to her for several reasons, making her seem different.
Suddenly, a light gleamed from where Twilight stood as she made a glorious, angelic pose spreading her wings wide. Wing? That’s what that feeling was back there. One question was answered, but more arose as she saw her friends in front of her watch her in awe and amazement.
“I-I never seen anything like it!” Applejack proclaimed as she and the others approached Twilight.
“Twilight’s got wings!” Rainbow Dash gleefully shouted before embracing Twilight with a hug “A new flying buddy!”
“Not only that, but you’re a mare now!” Rarity said
Twilight was caught off surprised by Rarity’s comment “A mare?” She asked, but as she did so, she noticed a difference in her tone of voice. She looked upon herself, her hooves, her back, and her flank, even getting a feel for her face. She smiled and pranced in place with excitement that none of her friends had ever seen her express before. “I’m a mare! I’m finally in a mare's body!”
“Twilight Transition party!” Pinky yelled swinging from a rope attached to an unknown source as confetti and party balloons manifested out of nowhere.
“Oh my, and you’re an alicorn too” Fluttershy noted as she approached to join the group “You look like a princess”
“That’s because she is a princess” Celestia declared as she slowly descended to the ground, watching as everypony’s expression turned to that of surprise.
“A… a princess?” Twilight stuttered.
“Since you came to Ponyville, you’ve displayed the charity, compassion, devotion, integrity, optimism, and of course the leadership of a true princess. And your friendship helped pave the way to becoming your truest self, learning from your experiences, and taking pride in your identity and your accomplishments.”
“But will this mean I won’t be your student anymore?”
“Not in the same way as before. I’ll still be here to help and guide you, but we’re all your students now too. “Celestia bowed before her top student, along with all the other ponies beside her. “You are an inspiration to us all Twilight.”