Twilight had a bad feeling in her gut. As the dance went on, she noticed the absence of Sunset Shimmer and Goldenrise. She suspected the two were up to something, and her suspicions were confirmed when Snips and Snails abducted Spike right before she was crowned! She and her friends gave chase, and found Sunset standing by the statue with a sledgehammer at the read with Goldenrise at her side! It was then that she gave Twilight an ultimatum. Hand over the Element of Magic, or never see Unity again.
". . . No." Twilight said firmly. Visibly shocking Sunset Shimmer! "Unity's survived without the Elements of Harmony, and it will again. And I've seen the damage you've done without the Element of Magic. Leaving it in your hands would only make things worse!"
Sunset Shimmer scowled, and dropped the hammer. Ordering Snips and Snails to release Spike. But as Twilight's friends crowded around the crown's rightful owner, Sunset Shimmer snapped! "Oh yes! She's just so special!" Sunset was about to charge at Twilight when the sound of a motorcycle could be heard coming right towards them! Sunset broke off as Burst Stream pulled up and dismounted!
"Hope I'm not late to the party." Burst remarked as he set his helmet on his bike before looking to Goldenrise. "It's honestly pathetic how far you and Sunset have gone just for one crown."
"Coming from the guy who just stood by and let us have free reign for so long?" Goldenrise asked with a scowl.
"I realized my mistake. You two haven't." Burst said calmly. "I knew that if my dad were here, he would be ashamed in me. But more than that?" Burst Stream glared at Goldenrise. "He'd be disgusted by what you've done."
"RRRRRRAAAAAHHH!" Gold screamed as he charged at Burst! Only for Burst Stream to grab him by the arm and throw him at Snips and Snails! All of this prompted Sunset to get in on the action as soon as Gold had recovered! The situation becoming a game of keep away as the crown was thrown all over! Everyone trying to keep it out of the hands of one of the others! Eventually, the crown wound up in Sunset's hands!
"Finally!" Sunset said with a greedy smile. "After so long, I'm finally going to get all that I've ever wanted!" But as Sunset placed the crown upon her head, a surge of dark magic radiated from her body! Warping her into a demonic form! "Now the crown and the power with it is finally mine! Just as it was supposed to be all along!" She then used her magic to transform Goldenrise and turn Snips and Snails to stone!
Goldenrise glared down at Burst Stream. "You've been a thorn in our sides for far too long!" He dove down, and slugged Burst across the face! "You're pathetic! Weak!" Goldenrise spat as he kept attacking Burst! "How could Aether ever stand having someone like you as his son?!"
"Because. . . I'm stronger than you think." Burst said weakly as he got up. "Weakness isn't a measure of helplessness. It's. . . a measure of how much stronger you can get!" He then spread his arms out as he stood in front of the students! "For too long I let you both make everyone miserable. Even if it kills me. . . I won't let you take anyone else's smile!"
Demon Sunset sneered. "How touching. Acting like a big hero. You want to be one so bad?" She then launched a massive fireball at Burst! "THEN MEET YOUR END LIKE ONE!"
"AAAAGGHH!" Burst screamed as the fireball engulfed him in flame! He could barely see Sunset and Gold readying another attack when something blocked them! A shifting distortion in space materialized in front of Burst as he tried to power through the pain! When the shifting stopped, the distortion looked like a mirror panel. And staring at Burst from the other side was the dragon he'd seen as a kid! "You. . . "
"Do you want to save them?" The dragon asked as it motioned towards the students cowering behind them. "Are you just going to let those bullies have their way?"
"No. . . " Burst said in a pained voice. "I won't. . . let them win! Someone. . . has to stop them!"
The dragon nodded. "A wise answer. But as you are, you stand no chance. However, there is a way." The dragon reached through the mirror distortion, and was holding a small, black deck with an emblem similar to its head on the top. "By contracting with me, I will lend you my power. We will fight as partners. But once you link with me, there's no going back. Do you accept this advent?"
". . . Yes." Burst said weakly as he reached out and grabbed the deck!
The dragon seemed to smile. "Then from now on, you are Kamen Rider Bahamut." Just like his father before. Unlike then, I will not fail him! A belt formed around Burst's waist! The flames around him disappearing! "Cry out 'Henshin!' after slotting the advent deck into place, and your power will be unleashed!"
Burst did as instructed! Slotting in the advent deck! "Henshin!" A sphere of energy burst out from the belt as the deck seemed to spin inside the belt! Two rings then rotated around Burst! Covering him in armor, and disappearing as soon as the armor fully formed! When the smoke cleared, the transformed Burst Stream stood tall.
"What?!" Goldenrise exclaimed! "Where's Burst Stream?! He should've been burnt to a crisp by now!"
"I. . . " The transformed Burst paused. His voice was slightly distorted, but revealing his true identity wouldn't be the best move. "I saved him before you could hurt him any worse than he already has. Now that you look like the monsters you really are, I can finally get involved!"
"WHO ARE YOU?!" An angry Demon Sunset screamed!
Burst reflected on what the strange dragon had said earlier. "Kamen Rider Bahamut." He then got into a fighting stance! "And you're about to feel the power of a dragon!" Bahamut leaped into the air, and punched Goldenrise in the face! Sending him plummeting to the ground! "Let's see if you're any good on the ground!" While Kamen Rider Bahamut was fighting the transformed Goldenrise, Twilight and her friends had unlocked the magic of friendship! Bahamut noticed, and threw Goldenrise towards Sunset Shimmer! He then leaped up to where Twilight and her friends had assembled, and positioned himself into a side kick as they unleashed their magic! "RIDER. . . KICK!" As soon as he made contact a massive explosion happened! Forming a crater in the ground!
Kamen Rider Bahamut stepped out from the crater, and looked down at the reverted Sunset Shimmer and Goldenrise. "Looks like my work's done." He then looked over to Twilight and her friends. "You guys can handle the rest." He then got on the bike. "Don't worry. I was able to send Burst Stream home. I'll just be returning his ride." And with that, he rode off. Soon transforming back to Burst Stream and soon collapsing on his bed. The advent deck in his hands.
Back at the Fall Formal, Twilight had given Sunset and Goldenrise a chance to reform before going through the portal. Her mission completed. For now, the battles of both heroes were over.