Flash Sentry Chronicles: Rainbow Rocks

by Banshee531

Sunset's Debut, Siren's Swansong

Back onstage, the sirens continued to sing their hypnotic song over the crowd. Now that they had taken some of the Rainboom's magic, they could unleash their full power instead of just one person at a time.

With each note, their music dug deeper into the minds of their victims. No matter what, the students of CHS couldn't pull their eyes away from the trio. All their bodies would let them do was stand, watch and listen to the Dazzlings as they sang.

Meanwhile, up on the back hill overlooking the concert, the Rainbooms stood ready for action. All but two of them were dressed in the outfits Rarity had made for them, the ones left out being Flash and Sunset. Sunset didn't need a costume while Flash had one, but had actually grown a few inches since he was last here. so it no longer fit him. The six girls and one boy stared down at their opponents, hearing their music, only for a strong wind to blow past them. There was no way their counter-spell would be heard at the volume they were making.

"How are we supposed to play over those three from up here?" Rainbow asked.

Flash turned to his party loving friend, "Pinkie, you got anything for musical emergencies?"

Pinkie put her hand in her hair and pulled out a list. Reading it, she let out a long sigh. "Shoot. My usual list of hidden stuff isn't showing anything like that...except a few extra triangles and three hidden drum sets. I knew I should have hid an amp somewhere around here."

"So we're stuck?" Fluttershy whimpered out.

Flash nodded. "Unless someone has a way to transport a massive sound system to here in the next minute." This statement was met by the honking sound of a car horn. They all turned to see Vinyl drive up the hill in a white and blue convertible, which sat next to Sunset before its driver held out a remote. With one click of a button, the entire thing started to transform, the vehicle morphing into a fully functioning DJ sound rig complete with tire amps and most important of all...cup holders.

The Rainbooms all marveled at the device before they all plugged their instruments in. Once complete, they turned back to the stage, ready to take the Dazzlings down. And it seemed they're weren't a minute too soon, as in that moment, the Siren's power over the crowd had hit its apex.

The three unleashed a soundwave of magic, striking the crowd with ease. The spell put them one hundred percent under the trio's control, the negative emotions now coming in droves into the Siren's pendants. There, the thousand year old teenagers slowly began to hover off the stage and into the air, their gems now shining. That light wrapped around the girls like a cocoon, showing they were about to pony up.

Their ears morphed and shifted to the top of their heads while a pair of ribbons grew out of their backs. Then, the cocoon exploded off of them to reveal their new forms as the ribbons morphed into a pair of fish fin shaped wings.

Finally, after a thousand years, their power was back, and nothing was going to take it away from them.

The Dazzlings stopped singing and started looking around, trying to find the source of the interrupting music. Aria then pointed up at the hill, Adagio and Sonata following her gaze as they now all saw the Rainbooms. Gasping at this, the three then noticed their control on the students start to weaken as the new music kicked in.

As they continued singing, the six girls and one boy then found their bodies exploding with light. One by one, each transformed into their human pony hybrid forms as their vocal chords continued to ring.

Applejack hair developed a long red streak while Rarity's got twin streaks of pink and blue. Fluttershy gained a purple and yellow streak, while Pinkie gained a light blue and purple streak. Though if Rainbow received streaks, they didn't seem to show up in her prism hair. Twilight gained a dark pink and blue streak, while Flash got orange tips along with an orange streak running down his newly grown ponytail.

The Dazzlings watched their now powered up opponents continue to play. "So the Rainbooms want to turn this into a real Battle of the Bands?" Adagio asked before smirking. "Then let's battle!" The other two nodded before continuing to sing.

Their voices once again drew the crowd's attention, bringing them back under their sway.

As soon as they said those words, their eyes went completely red as the gems around their necks shined like stars. The light exploded around the trio, flying up before molding into the shape of a trio of horse fish hybrids. The top half was horse like, coupled with a fish like fin on its back and hooves while its waist morphed into a mermaid tail. Each one was its own color, either yellow, purple or blue. The Rainbooms all went wide eyed at the sight as the fish horse monsters began flying through the air like it was water.

"Are they allowed to do that?" Flash asked as the monsters circled them.

Twilight did a loud gulp. "Even if they weren't, I doubt they would let that stop them." Her face then started to show panic as the monsters flew right up to her face.

But as they did this, Pinkie started banging on her drums, channeling her magic the best she could. Vinyl turned up her rig's amplifier as loud as it could go, the drum beats exploding out the tires. The Sirens saw this and split up, the beats flying past them.

Rarity then struck several keys on her keytar and created an explosion of magical diamonds, which struck the purple siren and pushed her back. Fluttershy followed by rattling her tambourine, creating a flurry of energy butterflies that flew into the blue siren. Flash, Rainbow and Applejack then strummed their guitars, the three firing bursts of energy that raced after the last siren. But as the attacks flew, the yellow fish dodged the blows as Twilight started vocalizing. This unleashed an explosion of star shape projectiles, all now following the monster.

Adagio, seeing this through the eyes of her monster, growled before vocalizing herself. The monstrosity then unleashed several red soundwaves, which struck Twilight's as the two began pushing at one another. But as the struggle began, she quickly overpowered Twilight's before the other two flew up beside her. Together, the three Sirens harmonized their voices, unleashing a combined sound attack that assaulted the Rainbooms. The seven tried to stay strong, but the force suddenly knocked all but one off their feet.

"AAAAHHH!" they all yelled as their backs hit the dirt.

"Girls!" Flash yelped, only to feel the ground shake as he now stood alone. The music was now rattling the earth around them, making him turn back to the Sirens.

"Let's get him girls!" Adagio ordered as the trio took a deep breath.

"Aw crap." Flash muttered as he started strumming his guitar to try and push back the Sirens' next attack. But as he continued to shred, the sirens keep firing soundwave after soundwave. "Rrrghhh…" he moaned as he felt another blast, "Can't...give up...have to....AAAAAAAAAHHHHHHHH!!!" A scream echoed out of his mouth as Flash's eyes started showing a shining gold color. A light then shot out of his eyes, the glow now wrapping his body into a shining tornado.

The Rainbooms, Sunset and Spike all gasped at the sight, the light immediately pushing the Sirens' sound waves back as the armor began to appear on Flash's body. It was basically the same as his pony form's armor, only his hoof armor was slightly different. Now they were shaped like metal boots and gauntlets that covered his wrists and arms, but left his hands free. Another thing that changed was his guitar. The red, white and black instrument glowed with the magic, the white section now becoming Flash's mane blue, with lightning bolts patterns appearing on it while several things of Flash's cutie mark began appearing in a line up the neck.

The Dazzlings had to admit, they were intrigued. Even back in Equestria, they had never seen magic like this before...and they wanted it. The Sirens once again began harmonizing as they unleashed their dark melody, but Flash channeled all his power into his guitar and fired a blast of energy out of his guitar's neck. That power flew out the tornado and formed a shield above them, the Siren's soundwaves bouncing off the barrier and back into their faces. The horse fish monsters all cried out as their own attacks struck them, pushing them back while the Dazzlings flinched.

Flash's friends all cheered at the hit, only for the light coming off Flash to suddenly disappear along with the energy shield. They all gasped as they saw the light explode off him as his armor vanished, Flash falling to his knees, panting heavily.

"Flash!" Twilight ran over and knelt at his side, "What's wrong?! What happened?!"

"That's...a lot...harder...to do here."

This made Twilight go wide-eyed, only to hear the Dazzlings and their monster forms appear again. Turning, they saw the creatures tower over them, making her gulp. One thought went through her mind: They need more power. The Dazzling's stolen power, coupled with their own, was just enough to overpower them. They needed a way to tip the magical scale in their favor.

And as this thought went through her head, Twilight remembered what Flash had said before. She then turned her eyes to Sunset, now seeing she was carrying the microphone Twilight had dropped when they fell. Maybe Flash had been right about having her help?

No. There was no maybe about it. "Sunset Shimmer...we need you!"

Sunset hopped in place at the words, her face saying she didn't believe she could be of any help. But as her vision shifted from one friend to the next, she saw nothing but looks of absolute confidence. They truly believed in her...something she never thought she would see.

And as her gaze fell on Flash, he gave her a small nod. That motion alone made her remember what he had told her before. Her past does not define her, her past is not today.

The Rainbooms then watched as Sunset stepped in front of them, taking off her jacket as she stared the sirens down. Sunset held up the microphone while Vinyl began playing Pinkie's drum solo.

She turned around and held out a hand, which Twilight took with no hesitation. Sunset pulled her back to her feet while the rest of the group stood up and began to play as well.

As they began to sing the chorus, the Rainbooms all started glowing their respective colours. The Sirens saw this and once again tried to counter, but it was too late.

The light shot off the Rainbooms, forming a rainbow colored wave of music that struck the Sirens, blasting them back. It then flew over the crowd, completely wipping out all traces of the Dazzlings' magic. The Dazzlings were next to be struck, their monster form freezing in place as the girl's spirits were forced out of them. The three gasped as their eyes returned to normal, all feeling their gathered magic disappearing.

Back on the hill, the Rainbooms continued to sing. And as they did, Sunset suddenly started glowing as she began to hover off the ground. Her friends all smiled as they watched her glow like the sun, those grins increasing when Sunset's ears and hair morphed to be like theirs, the girl now ponied up.

As soon as Sunset's transformation was complete, the rest of the Rainbooms found themselves glowing and floating up beside her. And as this happened, the newly freed students of CHS began singing along with them as the eight all held hands.

The light that surrounded the eight now formed a rainbow of blue, green, yellow, orange, pink, violet and purple. Finally, Sunset's light of red shot out and struck the rainbow. The eight colors then began to spiral around before merging into a sphere of pure white light. And from out of that sphere folded out a pair of majestic blue wings.

The Dazzlings watched as the students of CHS continued singing along with the Rainbooms, then looked up and gasped when they saw the sphere fade to reveal something new. It was a giant blue alicorn with a mane and tail of a rainbow, staring down at them as its horn began to glow. Before they could do anything, it unleashed a rainbow blast that struck the Sirens' avatars, making the trio crack up before being completely vaporized.

The Dazzlings were next, finding themselves bathed in the light that ripped away the last of their magic. The light was so bright, it stopped them from noticing their pendants were beginning to crack. Then, they could no longer take the force of the magic, the light now exploding around them. And as the light disappeared, so did the alicorn and the storm clouds that had been surrounding it. The Rainbooms all floated back down next, reverting to their normal forms and turned back to the stage to see what had become of the Dazzlings.

The three were all laying on the ground, rubbing their heads before staring at the floor below them. There, they saw the remains of their pendant gems, all shattered to pieces. Adagio picked hers up as the three got back on their feet, looking out at the crowd before beginning to once again sing. But this time, their song had no music, and was horribly off key. The Dazzlings quickly heard this and looked at each other in panic, only to hear a volley of boos from the crowd as they started throwing whatever they could get their hands on.

And as the Rainbooms ran around the crowd and up to the stage, they watched as the Dazzlings ran away while being pelted by fruit and over stain making projectiles. "That's right!" Flash yelled after them, "You'd better run!"

Sunset chuckled at the sight before noticing the remains of the other gems, which she picked up to examine. "Guess that explains why these were so special to them."

Twilight nodded at this. "Without those pendants and the magic you brought here from Equestria, they're just three harmless teenage girls."

"I wouldn't say harmless," Flash replied as he rubbed his ears. "You heard them singing. That was more painful than anything I've had to experience here yet....mostly." The others all laughed at this, Flash included until he felt something jump on his back.

"FLASH!" Heather screamed as she hugged him piggyback style, "That was amazing!"

"Thanks Heather," Flash replied as Heather jumped down. Iron and First also walking up to them.

"I have to admit, that was some spectacle." First added.

"It was alright," Iron finished while looking slightly away. "Especially for you."

"Thanks guys," Flash told them, only for a certain magician to suddenly pop up and point at the Rainbooms.

"You may have vanquished the Dazzlings, but you will never have the amazing, show-stopping ability of the Great and Powerful Trixie!" With that, she tossed out a smoke bomb, creating a puff that blinded everyone.

Once they finished coughing and the smoke faded, they all saw Trixie had vanished. "She's gone!" Pinkie screamed, only to then point at the back of the stage, "Oh wait, there she is." The others followed her finger and saw Trixie trying to climb over the back of the bleachers, only to lose her balance and fall off.

Everyone laughed at this, only to hear a knocking sound coming from beneath their feet. Everyone looked down, Flash raising an eyebrow, "Is someone down there?" As soon as he asked that question, he remembered what happened earlier and went wide eyed. "Oh yeah!" He ran over to the lever while the others moved to the side of the stage.

One lever pull later, they found the stage's trapdoor fall to reveal Grand looking up at them. "Someone mind telling me what I'm doing down here?" The others all smirked as they helped the janitor climb out, explaining the situation to him as they did. "That's a relief," he replied before turning to Sunset. "Thank you."

Heather slung her arm around Sunset, "Yeah! You were awesome too."

First nodded in agreement. "No doubt in my mind, you truly have changed for the better."

Iron looked away again, "Sorry about what I said before."

"It's alright," Sunset replied as a huge smile appeared on her face, "Thank you."

Then, she felt a tug on her shoulder. It was Rainbow Dash, smirking at the reformed unicorn, "You know, Twilight and Flash are going back to Equestria soon. The Rainbooms could really use someone to help Fluttershy on backup vocals." Sunset gasped at this, then smiled before walking over to where a guitar was left.

Everyone watched as she played an awesome riff, only to stop and sheepishly blush at them. "I also play guitar."

Everyone turned to Rainbow in worry, fearing she might change her mind...but the smile on her face said otherwise. "We'll see." Everyone laughed at this as they ran over to Sunset and pulled her into a hug.

This hug was only broken when the crowd started chanting for the Rainbooms to keep playing. Not wanting to deny them, the Rainbooms rushed to grab their instruments and began playing another of Fluttershy's songs. Sunset took Flash's spot, the teen wanting the chance to play with the Royal Knights for real. The two bands played into the night, the battle of the bands returning back to the musical showcase it had always been meant to be. They didn't stop playing until their hands and voices were sore, which didn't happen until three AM.

The next morning...

And thus, the moment everyone had been dreading had arrived. With the threat to this world gone, Twilight, Flash and Spike had no reason to be there anymore. They had to return to Equestria, which the Rainbooms, Royal Knights and Grand were all obviously not happy with. Well, except Pinkie, who was about to put her face into the portal.

"Sure wish ya'll could stay longer," Applejack told the trio as they stood in front of the portal.

"Me too," Twilight replied while Flash nodded. "But we have responsibilities in Equestria that we have to get back to. Its citizens need us."

"Besides..." Flash added as he pulled Pinkie before she could look inside the portal. "It's not like we won't see each other again. Now that we can go through the portal whenever we want, it's practically like being in the next room." The others all nodded back, Flash smirking at the sight, "That and maybe I can get some of this world's ideas back in Equestria."

"Yeah yeah meathead, try to change the subject." Twilight grumbled as she gave him a glare before looking back at her friends, "Everyone...this isn't goodbye. It's just goodbye till next time."

"Alright then," Grand walked up to Flash and held out a hand. "You be careful out there."

"I'll try," Flash shook his hand, Twilight giggling at the statement. "What?"

"Just trying to imagine you being careful."

"Oh, ha ha." Flash grumbled as he walked up to the portal. "Ready?"

"Yes." Twilight turned to Spike, "You ready?"

"Ready!" The dragon turned dog barked back before walking into the portal. Twilight followed suit, glancing back and smiling at her friends before stepping inside.

Then, Flash put his leg into the portal as he gave a salute to everyone. "See ya. Try not to blow the place up while we're gone." With that, his form phased into the stone and completely disappeared.

And thus, life went on as it had done before the Dazzlings arrived. Well, not exactly as it had been. Now, Sunset's actions at the fall formal seemed to have been forgiven by everyone in school. After the Rainbooms explained how she had helped tip the scales of the battle in their favor, everyone came to the decision that she deserved a second chance.

Now, several days after the battle of the bands, the Rainbooms were back at the concert stage, ready to practice again. And as the others readied their instruments, Sunset had her journal out. She had chosen to keep it on her like she did back in Equestria, now sending messages to Twilight whenever she could.

Dear Princess Twilight,

Missing you already, and I hope you'll be back soon. Things are definitely looking up for me here at Canterlot High. But I know I still have a lot to learn about friendship. Hope you don't mind if I write to you for advice when I need it.

Your friend, Sunset Shimmer.

And as she finished and closed the book, she heard Rainbow call out to her. "You ready or what?"

Sunset nodded before putting the book back in her bag and picking up her guitar. "Ready!"

The others all shined a grin before Pinkie tapped her drum sticks together. "One! Two! Three! Four!"

Yes, CHS truly had reached a point where everything was perfect. With the Rainbooms finally a true team along with Flash and Twilight just a few worlds away, nothing seemed capable of overcoming them.

Or was there?

In a dark shed like laboratory, the scratchy sound of pencil on paper filled the air. The source was a device one would mistake for a seismograph, which was currently moving side to side, the red pencil on its end drawing a wavy line on a long piece of paper. Once it stopped, a figure appeared and ripped it if off the machine. They then moved over to a board showing an image of CHS, which was surrounded by long red lines leaning to pieces of paper that had multiple confusing equations and such on it. They pinned the new piece of paper onto the board and stepped backwards, revealing themselves to be a very familiar purple skinned girl, though her hair was up in a ponytail, and she was wearing a lab coat with a pair of square glasses on her nose.

The girl continued to stare at the board, only to let out a long hum, "No doubt about it guys, there's definitely something strange going on at that school."

This statement was met by a bark, curtsy of a familiar purple dog that was eating out of a bowl. And as the girl continued to stare at the board, the sound of shuffling chairs caught her attention. She didn't look away from the board, knowing there was now three figures stepping up to her.

"Well, this is gonna be interesting." one of them said, soon walking into the light. He looked just like Flash, though he had longer hair and was wearing a black leather jacket and blue pants over a white shirt that had his Cutie Mark on it. The last two then revealed themselves, one being a teen boy that had yellow skin and spiky white hair with yellow tips. He was wearing a white hoodie, with yellow around the seams and hood over a black colored shirt and pants. Around his neck were a pair of silver headphones, each side displaying a yellow lightning bolt. The other person was a slightly older woman in her early twenties, who had blush red skin and dark scarlet hair. She was wearing a pink suit and had a pair of silver glasses hanging around her neck.

The yellow skinned boy smirked at the picture of CHS. "Looks like things are getting a little more interesting at my old stomping grounds."

The older woman just sighed at this. "Alright...but I need you all to be careful. If you get caught there, who knows how much trouble you'll get in. The Friendship Games are only a few weeks away, so they'll be expecting you to show up there."

The Flash lookalike smirked as he went up to the board and pulled the picture of the school down. "We'll be fine. Whatever happens, we can handle it."

Twilight then shook her head, "Just remember, we can't take too many risks."

"I know." he then tapped the picture with a growing smirk, "And they'll never know what hit them."