"Alter one event and a new future comes to be. Splinter a link and a new chain is forged "
-- Star Wars Infinities, A New Hope
Sunset Shimmer felt a pulse of energy surge through her, she didn't quite know what to make of it. Perhaps the singing had something to do with it, but she felt more in touch, more in sync with her new 'friends'. They needed her as much as she needed them, the Sirens already proved that without her their powers weren't enough to defeat them. They had all but blown them all down even after a powerful push from their magical song. It was only after Sunset joined in did they start to make progress.
In fact, they were starting to win now, the chorus was kicking in, and there was another burst of magic. Magic she'd forgotten the feeling of. Magic she'd had only once before, before she started making friends, when she'd turned into a demon.
The feeling was incredible, and she wanted to make sure it stayed here, and the only way she could ensure that was to stop these Sirens. They had only one chance to do it. The memories of the physical beating she'd received in the hallway by the three girls was fresh on her mind, reinforced by the br uses and tenderness in her ribs. Someone had to stop these monsters. A little payback was just a bonus.
Aria Blaze was jarred awake by a slap to the head, whatever magical blast hit her and the other two had knocked them out for a moment. Their clothing in shreds, Adagio yelled at them to get back up and use what power they had left.
She'd warned her so called leader this might not be the best idea, but it fell on deaf ears. In fact, things were turning worse than she thought they might, whatever magic was manifesting inside those other girls was increasing fast. She needed an escape plan and fast.
Sunset opened her eyes and summoned every bit of power inside her, combining it with Twilight's it was already more than what was needed to thwart the Siren's plans. She couldn't let them take away any of what she'd worked hard to get back. No. She needed more! They needed to pay for what they did to her! To her friends!
“Sunset, what are you doing, you're manifesting too much!” Twilight yelled, but the construct was already forming above them. It took the form of a giant alicorn and it was powering up for a massive blast of dispelling magic.
“Payback!” Sunset yelled as the power gathering around them deafened them, the focus was already preparing to fire.
Aria started backing up, this wasn't working, whatever they threw at the Rainbooms had no effect. In fact, they were getting stronger, so strong their own siren constructs had frozen in place. She backed up past Sonata, leaving herself in the lead for a quick getaway, which was starting to look like a smart move.
“Oh crap! RUN!” sonata said backing up another step. “We're all gunna die!”
Sunset felt the construct build up and fire. The downward shot of pure white energy turned into a focused line of fire, hitting Adagio first, then Sonata, then Aria last.
Aria cursed and backed up as the magic fired, and their stubborn leader finally turned tail and ran with Sonata. They both didn't expect Aria to strike them in the chest, doubling them over facing her. She ducked beneath them as human shields, the brunt of the blast hitting the other two and quickly destroying their gems. Aria looked at both of her 'sisters' expression, satisfied for a moment. Adagio always was so smug and treated her awful, it was nice to see her knocked down a peg. Sonata's moronic behavior was always a pin in Aria's dreams of being in charge, she wouldn't be missed. Both of them cried out for a moment until the charge tore their bodies apart and turned them to literally nothing, the power dissipating as Aria had anticipated, but not enough, it struck her next, and threatened to take her too. She yelled out in pain and put her arms up instinctively to defend herself, the searing heat from it scarring her forearms up and down, before stopping finally burning itself out.
Sunset watched as the Siren's were taken out, pleased but horrified at the same time. More concerning was the fact she couldn't stop the magic pouring out wildly now. It was saturating the area, as bad as gasoline fumes in a room. It was starting to become dangerously volatile. She couldn't stop it, even with her friends. The so called power they had was useless at this point.
Aria collapsed backwards and yelled as she felt the pure undiluted magics in all three of their magical gems mingle and turn into pure dark magic. She looked up and saw a ball of manifesting Equestrian magic in front of her and rolled off the stage, behind a rock. This wasn't going to end well, had to protect herself first!
Sunset's eyes widened, a spark to all this gasoline was heading right for them! She looked around frantically, and tried to think...the only thing she could focus on was the nagging feeling that maybe Celestia was right to cast her aside. When it came down to it, she wasn't powerful at all...but neither was this so called Magic of Friendship.
A blast of white light overcame all of Canterlot Highschool's grounds and shook the earth from their to across the bay in Equestrian City. A growing spherical shock-wave knocked out electricity and overturned cars and damaged structures from its epicenter to the first few neighborhoods in the suburbs.
Sunset Shimmer felt the explosion rattle her teeth and knock her to the ground. She landed with a grunt, the wind knocked out of her. Screams filled her ears as a rumbling shook the ground around her, she couldn't see anything, the world was spinning so fast and her senses were being overwhelmed. Standing back up, she was knocked to her knees again as the ground shook. She squinted her eyes and tried to find anyone, all she could see was dust, and all she could hear was screams. Suddenly, a burst of purple hued light filled her vision, near what she assumed was the stage area. A figure emerged from the center of it, she couldn't tell what it was, but it was moving.
Another quake rattled the ground as the purple orb vanished with its occupant. The shock-wave from its displacement rapidly overtook Sunset's position and knocked her out cold, the last few faint sounds of chaos around her giving way to darkness.