Prologue

Princess Moon was laying on her bed in her room that was located in the top tower in the royal Castle. Like clockwork every day, she studied her magic book thoroughly, wanting to get stronger every day. She has been earning a reputation in her bloodline as being the "undaunted" Butterfly, and her fights with the immortal monster has only strengthen her name. Monsters are always in every corner in this medieval looking world called Mewni, and while the monsters have their strength and ferocity in their side, Mewnians have magic and no family is better had summoning magic than the Butterflys. After all, is the reason why their royal bloodline have been in power since Mewni's first settlment.

Princess Moon began getting bored with just reading, she wanted to try out her magic/combat skill, but the immortal monster or any other monster hasn't attack her kingdom in over a week.

"Does this mole on my finger look like it gotten bigger or is it just me?" asked the little blue man, Glossaryck, floating 4 feet from the ground. He is the guardian of the book and the mentor to every Butterfly princess.

"It just you Glossaryck," replied Moon, not looking at his direction. She then buried her face in the book out of boredom. "There is nothing more read, I need to try out these spells."

"Ah, the trope of every Butterfly," replied the mentor, "reading is never enough, just want to try to magic out themselves. You know their are some spells that are best left unused."

"Spells are practice for a reason, Glossaryck." Moon closed the book, stood up, and look out her window. "Fighting monsters is the best way to know if these spells do serve a purpose."

"I'm sure your mother would disagree princess," Glossaryck than gave her a smug look. "If you are so bored, than why don't you visit young man River's at his guarding post, a princess at your age should finally decide who the future King of Mewni should be."

Moon spun around and shot Glossaryck with a red beam from her wand, which missed of course. "Don't you dare you tease me Glossaryck," she said with cheeks red as the red beam she fired. "River and I are... complicated, but the day I rule Mewni alongside him is the day Lil Chauncy stops urinating on father's favorite chair. Besides, a Johansen becoming king of Mewni it's.. illogical."

"I see," Glossaryck said with his hands together, "But what does your heart says?"

Moon look down, thoughts swirling around her head. Even if she won't admit herself, she does love Rivers, but she is royalty and must put her duty first before any other feelings. River can be dimwitted sometimes and his love in fighting monsters is more of an addiction. He is better suited as a soldier than a king.

Before the discussion can continue, a Mewnian soldier came in Moon's room gasping for air. "We're under attack!"

"Well it seems you can try out some new spells after all, Moon."

"Better than reading them," replied Moon "So which monster is it this time?"

"It is a... red lightning."

Glossaryck and Moon look at each other with a confused look.

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Bells rung and horns were blown all over the kingdom. Its citizens followed protocol; civilians ran to take shelter at their homes while the soldiers ran to danger with weapons ready. Their people have been fighting monsters for a millennia, so this was nothing new. It was part of being a Mewnian, their world after all, is an hostile one, with the vegetation sometimes as deadly as a deer monster. Casualties weren't always that high, it usually depended on how many monsters their were and/or how fast can the magical princess can arrive. But this type of attack was their first.

Civilians watch as red electricity zoomed around their kingdom with swoosh sound, as though the electricity had mass. Mewnian soldiers were dropping like flies everywhere the red lighting passed. It became cleared that their necks were snapped and they were dead before their bodies touched the floor. It bewildered the living, lighting should electrocute not break necks.

"Stand your ground!" shouted the captain.

"To what?" replied a scare soldier, "We're just standing on the ground our bodies would be lying soon."

"You have your orders, we must protect the..." all was seen a quick flash of red lighting before the captain's neck suddenly snap. The life escaped from his eyes as his body collapse into the floor like a rag doll.

"Screw this, I surrend-" almost as though he teleported, the soldier found himself with his back against the wall. He felt a leathery hand grasping his neck and saw two red, vibrating eyes piercing into his soul. He has been chosen for interrogation.

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Rivers stood firmly in his guarding post, holding his giant axe in a battle ready position to battle any one who breaks into the room. To his disappointment, Rivers was ordered to stay at his post while his fellow comrades fought the attacker. Rivers is one to never back down from a fight, he enjoyed the adrenaline, the rush; especially if he was fighting alongside Princess Moon. But his duty to his kingdom must come first, and guarding the vault that contains Mewni magical relics is his priority right now. For if they would to fall in monster's hands, it would be catastrophic to Mewni, (and his relationship with the Princess).

"The monster better pray not come here, for he had never faced a Johansen like me!" exclaimed the proud warrior.

Well, he is about to test that remark. To his shock, a daunting figure just walk into the room through the door, as though door wasn't even there. Rivers took a good look at his opponent, it wasn't a monster he ever seen. The figure had red eyes and appeared to be vibrating yellow/black suit with a red lighting insignia on a black circle placed in the chest in the uniform it was wearing. He look more like a man than a monster.

"Do you wish to test your skills against a Johansen fiend!?"yelled Rivers and he charged at the man.

The man was walking toward the future king of Mewni and spoke to him in a dark, distorted voice, "I have no quarrel with royalty River, I only want what I came here for."

Just as River was almost close enough for striking distance with his axe the man in yellow disappeared with a trail of red lighting left behind that knocked Rivers 20 feet into the wall. The man in yellow was suddenly in from of the vault that led to the relics.

"And I always get what I want," said the figure. He placed both hands on the vault and began vibrating at super sonic speed. After a few seconds, the hinges on the vault burst off and the vault collapse to the floor, revealing a number of artifacts that were behind it.

"You thinks guarding is boring, just wait in 10 years,you'll be promoted to a much more boring a position,"spoke the man to Rivers.

"Being a prisoner in an isolated Mewni cell would be much more boring," spoke a female voice. The man in yellow and Rivers look behind to see Princess Moon battle ready and Glossaryck floating with feet and arms crossed.

"Ah, the princess and her table of contents, you look younger than I imagined," spoke the man in yellow.

Moon look at him with a puzzle look, "Have me met before?"

"No, not yet." He replied

"Than answer me this, Which tribe do you belong to? Which kingdom bears your insignia? Killing all a lot of my soldiers means war, and no kingdom does war better than Mewni," exclaimed Moon the Undaunted

This is why I love her thought Rivers.

"Oh you have no idea," replied the man in yellow.

"We have a couple of ideas" spoke Glossaryck.

The man in yellow look at the blue man, which was the distraction Moon needed.

"Rainbow blast!" was all that was heard before the man in yellow was hit a barrage of colors that threw him into the vault.

"See, I told you I could do this," said Moon

"Yes, well next time try not to pummel your enemies toward the objective they are trying to claim," spoke Glossaryk.

Than in an instance, Moon was hit with red lighting that shock and threw her across the room. She crashed with a large thud and her hair frizzled with the amount of electricity that coursed through her body.

"MOON!" exclaimed both Glossaryck and Rivers.

"Cute trick," out came a distorted voice.

Glossaryck and River look to see the man in yellow standing on his feet again, but this time holding one of the relics that was shape like a orb.

"Put your hands up you fiend," spoke Rivers as he charged at the man with his fists.

Rivers began swinging his fists at the man, but they never landed on their target. The man in yellow kept dodging River's attack as though he knew exactly where they going to land beforehand. Rivers did no give up, hopelessly attempting to land a punch at his opponent, but only end up hitting the air. The man in yellow began returning his own punches, with his being quicker and hitting its target. After a 25 second fight, the man in yellow deliver the final blow with an elbow to the face. Rivers fell to the floor.

"They never learn," said the man in yellow.

"Than teach me," spoke the little blue man.

Constructs made of pink magic appear from his gem that was located in his forehead and attempt to strike down the man in yellow. However they kept missing their target, the man kept disappearing and reappearing in a different spot, making Glossaryck hit nothing but the floor in what look like a terrible game of whack a mole.

"For the sake of my sanity, can you please stay in one spot for just a sec?," blurted out a frustrated Glossaryck.

"Like you?," came the distorted voice that emitted right behind Glossaryk. Before he can react, the man in yellow slaps him with the back of his hand that sends the little blue man flying across the room.

Moon was regaining her senses only to see Glossaryck and Rivers on the floor.

"No," she whispered. She aimed her wand at the culprit only to have him to appear in front of her and have the wand slap out of her hand in blink of a eye.

"No princess," he said as he grab her by the neck. "Let's have a little a talk."

He and Moon disappeared with a trail of red lighting that quickly was disappearing.

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Red lighting began zooming around the kingdom again, and Moon was surrounded by it. Everything was a blur to her, she could see colors move around her, unable to make out what they were, not knowing that it was houses, trees, people, the sky, moving around faster than the speed of light. Moon began to feel nauseated, feeling 5 times worse than that time she was sea sick. Suddenly everything seemed to stop and familiar surroundings of her room appear around her. She collapse into the floor with green all over her face.

"Don't be over dramatic princess," spoke the man in yellow, "It is just whiplash."

Moon swallow whatever was going to come out of her bowels and slowly started standing up. He faced her kidnapper with a dazed look.

"What do you want with me?"

"You think this is about you?" he said with a amusement in his voice. "I just needed to borrow something." He than raised his hand to reveal the orb shape relic that he stole. "You know how hard it was to get here?"

"Why do you need that?" asked Moon, who can only ask questions to stall time since she didn't had her wand.

"You could say, it's for a mutual friend of ours," he said.

"Who?"

"In time you'll see, but for now it is time for me to go." he replied.

"What are you?" she asked.

The man in yellow looked at her when an idea pop into his head. "We harness power from this," he pointed to his red lighting insignia.

Moon looked as though she had a revelation. "There is more of you?"

"Yes, while you people harness the power of the universe, we have the power to reshape the universe, to erase your reality and create a whole new existence." he said. "So let me give some advice if you ever meet another person like me; lighting insignia, similar outfit, power, and everything. Don't hesitate to strike first, even if that person seems like nice guy." He told her with a smirk, as though he planted a seed into her head. "Because the power we possessed shouldn't be allow to walk freely before you."

With that being said, the man in yellow disappeared, taking with him the prize he came for. Moon got on her knees, feeling a bit shell shock in what just happen in the last 30 minutes. Her state of mind was interrupted when the door suddenly open to reveal Rivers and Glossaryck.

"Moon!" they both said in unison.

Rivers ran to her, got his knees, and hug her tightly. "You're alright!"

"Yes I am," replied the princess. She broke free from his grasp and got her feet.

Glossaryck floated over to hand her her wand. "How do you feel?"

"Daunted," she said, half amused in her little joke.

"Glossaryk? What did he took?"

Prologue to what is to come. Just an idea that pop to my head. The story would differentiate from the Flash TV show, so don't expect some regular characters to pop up from that show. They would either not exist, or be incorporated into the SVTFOE universe in a different manner. Feel free to leave your remarks and call out any mistakes I made. The rest of the story would take place in present time.