A/N:Hello Internet! Before we start, I want to let you know that English is (sadly) not my first language, so please forgive my (very) limited vocabulary and (hopefully you won't find any) grammar mistakes. Feel free to judge / correct me harshly in the Reviews, if you want to (no, seriously, that would help). Hope you enjoy though!
The title of the story is simply Star Vs. The Finale as the whole fic is tentatively written to look like an actual series finale for the show (if that makes any sense).
Also, what a twist! I don't own Star VS. The Forces of Evil nor its characters. It's actually (C) of Daron Nefcy and Disney. Quite shocking, uh?

**Update May 2016:** The story has been renamed Star Vs. The Forbidden Dimension.

Chapter 1 (Prologue) - Fairytales

It was a beautiful night.
The sky was crystal clear, no clouds in sight.
Stars were shining brightly, glittering like tiny diamonds, still perfectly visible despite the dazzling light of the two moons.

The entire Kingdom of Mewni was asleep, not a single soul walking around: the moonlit alleys were completely deserted and even otherwise lively and crowded nightspots such as the Gryphon's Inn or the Three-headed Unicorn were closed.

Overlooking the peaceful town was the huge Royal Palace of Mewni, an enormous building adorned by tall dome-covered towers, undeniably the Kingdom's most interesting sight.

People living in the palace were privileged with a stunning a view of the Kingdom from above, a view that anyone would spend hours admiring; and that's exactly what a 5-years old princess was doing right now, despite being late night. Alone in her room, lights off, silently looking out the window, the young princess Star Butterfly was dreaming about a life of adventures, exploring faraway worlds and dimensions, fighting enemies and defeating evil forces. But she was too young to even leave the Royal Palace alone.
She was so completely lost in her imagination, dreamily admiring that stunning view of the moonlit Mewni, that she didn't even notice the adult figure looming darkly behind her.

"Star Butterfly!"

An angry woman's voice echoed in the room, taking Star off guard. The princess let off a tiny scream as she realized what happened.

"I thought you were asleep one hour ago!" – the woman continued.

The young princess had no real excuse. Hugging her stuffed animal tight (a lizard-like monster with four eyes), she tried to find a good answer to that.

"I… I'm not tired!"
"Oh yes you are, young lady!"

Star's mother was not easy to fool anyway: she was the Queen of Mewni after all.
Smart, sophisticated and a cunning politician, she was considered a role model for both men and women for the Kingdom and, hopefully, for her own daughter as well.
But Star's personality, despite her young age, was often incompatible with the Queen's devotion to old rules and traditions.

Being awake at night ignoring the curfew was nothing compared to taming wild, dangerous unicorns at the mere age of 4, something that Star did (more than once).
The whimsical young girl sure had talent for wacky and unusual stuff like this, but that's not how princesses were supposed to act.
The Queen, the woman who controlled the whole Kingdom, for some reasons had no real authority on her own daughter.

"Time to sleep, Star. The entire Kingdom is asleep, with the exception of its princess…"
"… and its Queen!" – Star replied, with a grin, trying to make her parent smile.
Not surprisingly, she failed.

The royal mother patiently guided Star to the bed.
The child slipped under the blankets, protesting a bit. She angrily hugged again her stuffed lizard, making a forced sulky expression.

"Stop making faces. Now go to sleep!"
"I told you, mom. I'm not tired!"
"Yes you are, and you better start acting more like a princess, young lady…"

The Queen was a great politician but for some reason she always had troubles with Star's whimsical nature. Not that the child was doing something incredibly terrible right now: the woman was simply very tired.
She didn't also realize that she was yelling a bit too much.

"Now go to sleep, or else…"

"Or else… what? What is going on here?!" – a man's voice interrupted.

Star's face lighted up as she saw her father walking towards her bed.

"Do you realize how late it is? I could hear every word you said from the other tower!"

"Finally. Glad you're here." – the Queen said, sighing in relief.

The King looked at his wife and then at his daughter, mildly confused.

"Could someone tell me what is going on here?" – he asked. He wasn't angry, just tired.

The young princess crossed her arms, still annoyed by this whole "royal-code" that she had to follow.

"I don't want to sleep. I'm not even tired!"

The King simply rolled his eyes and sat on the bed, facing the princess, but also smiled. He had some kind of soft spot for his daughter. One could say that he even sometimes encouraged her happy-go-lucky behavior.

"Yes you are, my starlight…"
"Nope!"

Star's father was much more patient than his wife. And he also knew exactly what was going on. And what his daughter really wanted right now. After some moments of silence, he talked again.

"How about a bedtime story?" – the King asked, with a smile.

Star tried to not look too interested.

"A story about adventure, magic, evil forces and a young rebellious princess?" – he said, smiling even more while finishing the sentence.

"The Legend of Princess Astria?!" – the princess asked, excited, but she already knew the answer to that question. The King chuckled a bit.

The Queen rolled her eyes too, but annoyed instead. She too sat on the bed, next to her husband. The King noticed the wife's irritated mood.

"You can go if you're not interested, my dear."

The Queen sensed the slightly sarcastic tone of that sentence.

"No, I'll stay here." – she replied, trying to look as distant as possible.

The King bent to her daughter. "Truth is, your mother loves this fairy tale as much as you do…" – he whispered, making sure his wife heard that.

Star quickly slipped her hands under the pillow and grabbed a small book. The father chuckled a bit as he knew that her daughter loved that story so much that he even wanted to keep the book close; but the King didn't need it anyway: he told her this fairy tale so many times that he completely memorized it by now.

"You can keep it, don't worry." – he said, as Star "hid" it again under her pillow.

Star's eyes gleamed in joy as her father once again started to narrate her favorite fairytale.

Once upon a time, there was a beautiful cosmic entity wandering through the Universe, a princess with no name nor kingdom, that everyone simply called "Princess Astria". She was a magical girl with the ability of jumping through dimensions at will, spreading love, joy and happiness wherever she went, befriending every living being she met.
One day, while visiting a fancy, royal dimension [very similar to our Kingdom, my darling], she met a boy around her age, Prince Deimor and…

"No!" – the Queen interrupted. "It's Prince Luxor. Lord Deimor is Luxor's brother…".
"Are you sure? I'm pretty sure it was Prince Deimor and Lord Luxor…" – the King replied.

"You were listening then…" – he then added, with a smirk. The Queen simply gave him an annoyed look, but she did like that story too, so she pretended to be irritated by all of this storytelling.

"Mother is right: it's Prince Luxor." – Star quickly checked her book before slipping it back under the pillow, waiting to hear the rest of the story.

"Anyway…" – the King continued.

She met a boy around her age, Prince Luxor and the two quickly fell in love. They were so different, yet they completed each other. But she couldn't stay with him forever.

"There are still so many dimensions to see, so many worlds to help…"

"I'll come with you, my love!"

Astria really wanted to take Luxor with her, living wonderful adventures together, but she couldn't. Her unique powers only worked on one person: herself. She felt too privileged. "Everyone should be able to see the Universe!". Astria realized that there was a way to let other people through dimensions like her and with her.

"Do you really love me, my Prince?"

"More than anything!"

"Then let your love guide you through the Universe…"

And thus she created one of the most powerful magical artifacts that we still use today: Dimensional Scissors.

"As long as you love me, my Prince, those scissors will let you travel through dimensions at will, so you will be always able to find me, no matter where I am."

And he did. Prince Luxor was now able to visit her wherever she was. They lived incredible adventures side by side. Their love was so deep and strong that ignored any border that once kept the dimensions separated: the Scissors were actually "powered" by Luxor's love for Astria.

But if Luxor saw the Scissors as a way to reach happiness and spread love, somebody else would use them to reach power and spread war. Luxor's brother, the evil Lord Deimor, wanted to use the magical artifact to conquer other dimensions. Using the Scissors, he could finally open the gates of the legendary Forbidden Dimension, a place where the mighty destructive force of The Darkness was imprisoned, taking over the entire Universe.

Tapestry-like images of the fairytale started to flash in the room as Star's mother used her magic wand as some sort of projector. The image showed a demon-looking armor-like humanoid, grinning maniacally and surrounded by evil spirits of some sort.

Astria and Luxor fearlessly fought and defeated Lord Deimor and his legions, but The Darkness was ultimately freed. Was it too late?

The magical princess couldn't let The Darkness invade the Universe she swore to protect and love. Just as the dark entities were emerging from the portal, she bravely stepped right into that dark cloud of pure evil and started to shine, as bright as a star. The Darkness was completely overwhelmed by the sheer force of Astria's light and quickly retired in its own cage just as the portal closed behind it.

The Universe was safe and as Lord Deimor was imprisoned for his crimes, Astria and Luxor continued to travel through dimensions, living great adventures and loving each other for the rest of their long lives.

"See, my darling. This is why we can use the Dimensional Scissors. Prince Luxor's love for Astria is what keeps the scissors 'alive' and…"

"It's just a legend." – the Queen interrupted.
"No… it's not!" – the King quickly replied.

"Legend or not, Princess Astria was amazing! Take that, you dark… Darkness!" – the young princess shouted, goofily waving her arms pretending to fight some invisible enemies.
"And that happy ending… sometimes it sounds too happy to be true… awww…" – she was completely lost in her imagination as she finally yawned, tired. "I can't wait to be 14 and have my own royal magic wand… So I'll be a magical princess just like Astria!"

The King chuckled a bit and kissed her daughter's forehead.

"Trust me, my darling. You are already magical…"

As Star was already falling asleep, the King got up and left the room.
The Queen, who was trying to be all-serious, finally sincerely smiled too and kissed her daughter in the forehead just like her husband did seconds earlier.

"Your father is right, my little Star. You are magical… one day, you will shine brighter than the brightest of the stars…" – she whispered.

End of Chapter 1