Twilight Sparkle wasn't crying. Not because she wasn't miserable, she was, but because she had already run out of tears long before any of the events that had led to her banishment to these stars had even occurred. It had been an overtly desperate, last-ditch attempt of an action. (Twilight had known it then, and she still knew it now.) But she was panicked, and it was very common knowledge that Twilight wasn't the most rational of ponies whenever she was in a state of panicked stress.
Twilight could easily remember her final moments on Earth, sorry, 'Neo-Equestria', before that madmare banished her. The events were very recent, but felt as though they had been decades ago.
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Twilight blanked out the droning about 'preserving the purity of Equestrian friendship' coming from the mouth of what had once been her beloved mentor, but was now nothing more or less than a tyrranical villain just like Nightmare Moon, Discord, Queen Chrysalis, King Sombra, Sunset Shimmer, Tirek, the Sirens, and Starlight Glimmer. Twilight couldn't help but notice that Luna had been just as openly defiant of Soleste's so-called 'glorious new approach to spreading the truest magic of friendship by establishing a larger circle' as Twilight had been, but Luna, much unlike Twilight, had found herself imprisoned in the dungeons rather than banished.
Twilight almost hoped that other villains would attempt to usurp the current tyrant, but she didn't count on it. She hoped that Shining Armor and Cadence's secret conspiracy would do better than Luna and herself had.
Even so, she desperately hoped that the humans would win, survive, escape, something! Twilight knew, right there and then, that she would not, could not, allow Soleste to get away with her madness.
Then, after what had felt like several consecutive eternities, the moment finally came, the baneful aura emerged from the mad ruler's horn as she cast the spell to banish Twilight to the stars.
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Twilight knew that she needed a better plan to put an end to Soleste and her insanity, but that was easier said then done. After all, Soleste, in her madness, managed to 'level up' into some strange kind of being that can only be described as the first ever archalicorn in existence.
Even still, that was the least of Twilight's worries, her body shuddered involuntarily as her thoughts drifted to the memory of the last moment she had shared with the five mares that she had come to know as her friends...
+++ +++ BEGIN FLASHBACK +++ +++
The six of simply stared at each other, not moving, not speaking, just staring. Fluttershy opened her mouth to say something, but whatever she had been about to say was shot down when Twilight said, "This is just like the wedding, except that we all know I'm right about the current situation, you just won't do anything.
"No! I'm not exaggerating, this is exactly the same, I tried to take action, I failed, and now I'm being abandoned by those closest to me. Well, except Spike, but that's only because he's, he's," Twilight broke down into sobs, unable to bring herself to finish her sentence. Her friends left her alone, in a deliberately slow pace. They clearly had been affected by Twilight's words, because they hadn't been able to bring themselves to attend Twilight's banishment ceremony.
+++ +++ END FLASHBACK +++ +++
Twilight had never felt so trapped in such a hopeless situation in her entire life. But, seeing as she was imprisoned, she was also helpless, she had no options or choices to make.
"Do you truly believe that you have no options?" asked a mysterious presence.
Twilight turned, gasped, and asked the entity in front of her, "W-What, what, what are you?"
"I am Galactus, the be-all and end-all of the Universe."
"What, what do you want from me?"
"I want you to become my herald, Twilight Sparkle."
"Your... herald?"
"Yes, as the Devourer of Worlds, I require a herald to search the cosmos for compatable energy sources to feed off of in order for me to sustain myself."
Twilight gasped as the entity beamed all of this information and more into her very psyche. After she recovered, Galactus continued, "If you agree to serve me as my herald, then I will grant you the meanest fraction of my power."
"And, and your p-power is..."
"Yes, mine is the Power Cosmic!"
"Th-This, this is, I-I mean this is all so..."
"Do you accept my offer, Twilight Sparkle? Are you willing to become my herald?"
"Yes, Galactus, err, Master, I accept your most gracious offer to become your new herald."
"Very well."
"And, Master, I..."
"Yes, my new herald?"
"Master, I wish to bring you to Earth when my banishment ends and Soleste's magic no longer blocks it off from me."
"You would willingly doom your own people and your own world to my hunger, my herald?" Galactus inquired in obvious shock.
"Earth was never my world, Master..."
"And?..." Galactus prodded gently.
"And they are no longer my people, not anymore. Everything has become so corrupted that your arrival would be the only act of mercy left."
"..."
"Master?"
"Well said, my herald, well said. Now, prepare yourself!" Galactus said as he lifted his hand over Twilight, which glowed with the might of the Power Cosmic.
Twilight's heart skipped a beat.
Then, it happened. A minuscule trickle of the Power Cosmic poured out from Galactus's hand and into Twilight's body. Twilight closed her eyes as she braced herself for a painful, gradual transformation. She needn't have bothered. It was instantaneous.
Twilight opened her eyes, and was pleasantly surprised that her Master had ensured that she would be instantly adjusted to her new form, and instinctively knew how to use her newfound powers over not only her personal variant of the Power Cosmic, but also her Power Cosmic-enhanced magic! But then again, Galactus had always expected his heralds to immediately get to work on finding energy sources to feed on, so of course he enabled his heralds to skip learning how to master their abilities.
"Listen carefully, my herald, as I am in an especially giving mood right now, I am willing to allow you to decide upon your new name."
She closed her eyes, she thought long and hard, and, finally, she opened her eyes and said, "Master, I am Silent Dusk, the Herald of Galactus!"