//------------------------------//
// Rainbow Breaks The Limit! Big Mac Shows His Strength! 
// Story: Oak The Shadow Dragon 
// by ShadowDragon6 
//------------------------------//

The ponies assembled looked at Oak's body sadly.
"Oak..." Applejack said sadly, taking off her hat and hiding her face as she cried.
"A... A was just startina like ya." Big Mac said sadly.
"This is serious!" Twilight realized, still exhausted from her last laser attack. "Pinkie!"
"Yep?" Pinkie asked.
"Get Fluttershy and Rarity, we need to use Rainbow Power to defeat him!" Twilight yelled.
"Okay!" Pinkie said happily, diving into a present box and disappearing.
Ashmodeus laughed. "Oh, what a shame. Looks like I'll have to wait a few thousand years for him to reincarnate. I guess I'll just have some fun destroying this planet in the meantime. He liked this town... Maybe I'll just leave this town alive, so I can turn it into my own personal theatre to the beauty that is death. Maybe the sight of that will make Ashmodeus remember how to hate. Maybe his next form won't be a blasted po-"
Rainbow Dash yelled in fury and flew, breaking the sound barrier three times and making a Sonic Rainboom each time, and she punched Ashmodeus in the face hard enough to send him through Canterlot mountain, collapsing half of it on top of him.
He blasted the rubble away and flew up with a sword made of black fire in his hoof. "Black Blaze! One scratch with this, and nothing can put out the fires that'll burn you to nothingness!"
Rainbow Dash flew at his arm, hitting it and letting her rainbow trail slice off both limbs.
Ashmodeus screamed like a little girl, and then Rainbow flew past his head, punching it as she flew past. And then she flew back the other way, punching the face in slow motion. And then she punched his crotch with a flying kick in slow motion, followed by the side of her arm hitting his neck hard enough to crack it in slow motion. Ashmodeus was pushed back away, and Rainbow easily caught him, and kicked down into his crotch, sending him to the ground as his fires went out. "This'll take the Shadow Dragon out of you." Rainbow smirked.
He gasped out a weak breath, the smugness finally gone from him.
She overtook him going down and kicked him into the air hard enough to snap his spine, and the shock on his face was clear.
"I can see what Twilight was saying when she said you things are older than the universe!" Rainbow shouted, kicking him to the side, then in the chin, then in the muzzle, then in the back, then kicking his crotch again and knocking him to the ground. "MY GRANDMA IS FASTER THAN YOOOOOOUUUUUU!"
As he fell, Rainbow screamed in hate, flying downwards with all her might and pushing him faster and faster towards the ground, punching his crotch again and again as he screamed and they both went down, and then they both hit the ground, creating an enormous rainbow nuclear explosion that burned him and broke her arm. He screamed like a little mare as he was destroyed, and when it was over, Rainbow flew in the air above him, a rainbow fire burning on her horribly broken hoof that flapped limply in the air like a really badass cape. "Ow." Was all she said, too cool to say anything else.
Big Mac's jaw dropped, but Applejack had barely noticed. She was too busy looking at Oak's body, and trying not to cry any more. Twilight was eating some grass on the floor to try and get back her strength, and once she'd gotten enough, she started using an energy-draining spell on the grass around her. The grass died and turned brown, and Big Mac noticed. "What're you doing?"
Twilight hopped back up as more and more grass died. "Draining energy from the ground. It's an emergency." With her new power, she cast a healing spell on Oak, fixing his neck. His heart was still beating, so once she fixed that and the bit of spine inside his neck, he'd be fine.
Soon, Oak blinked, purple fire burning around him that healed his body. "Thank... you..." He whispered weakly, his voice still recovering.
Ashmodeus's body got up, black fires burning his wounds closed as he pounced on Rainbow Dash, wrestling her to the ground and biting her wings hard enough for them to sink in. He tore a wing off with his teeth, and then smacked her head into the dirt hard enough to give her a concussion and brain damage, her eyes rolling back in her head. "It's a shame you're not on my side... With strength like yours, you would have made a fine bride."
"RAINBOW!" Applejack yelled.
He kicked her crying form, and bit into her chest, leaving a huge bruise. "After I trained you properly to submit to your superior, that is."
Twilight quickly used what was left of her energy to heal that damage to her head and her hoof, and stop the bleeding, but she didn't have anywhere near enough to fix her wing. She collapsed back down, annoyed.
"Twilight! Can't ya fix her?" Big Mac asked.
"I can't, not without doing permanent town to this town's ecosystem! Nothing would ever grow in this town again if I did that!" Twilight said.
"Then drain ma energy, instead!" Big Mac declared, running over to Twilight and kneeling. "Take ma energy, and fix her!"
"You don't have enough energy for that!" Twilight declared. "I'd kill you and barely be able to stop her bleeding in return!"
Big Mac growled. "Dang it... Why am A always so USELESS when monsters like this threaten ma town?!"
"Hey, Twilight, I got Fluttershy and RarAAAAAAAAAAAAAAAAAAA!" Pinkie screamed, and so did the others, when they arrived and she saw Rainbow Dash.
"What did I miss?" Rarity asked, summoning a giant sewing needle and some fabric. "Did that brute do this?"
"Angel Bunny's gathering up the biggest monsters in the Everfree, he'll be here soon." Fluttershy said. And then she saw Rainbow, and started to cry.
"Yes, he did." Twilight said angrily.
"Twilight... Drain my energy." Oak whispered, purple fires burning around him. "I can take it."
"Ok." Twilight said, draining his energy. He screamed, it felt like his fire was being sucked out of him and burning him at the same time, but for Rainbow Dash, he'd suffer through that and worse.
"What's she doing, torturing him to bring out his inner darkness?" Ashmodeus asked, amused.
"...Yes." Twilight lied cleverly.
"Hm. You weak creatures and your friendships... You'd always sell each other out or do whatever you have to when the chips are down, even if it means stabbing the one you called friend."
"So, he can take it, but A can't?!" Big Mac asked angrily, and then he started yelling. "I'm Big Mac! I'm the strongest pony on the planet! Every day, I have to hold back so I don't break my own trees! But you... You can take it, can't you?"
"I can take everything you've got, laugh, and spit it back in your face." Ashmodeus sneered.
"That's what they all say. THEN I BREAK THEM WITHOUT EVEN TRYING! Dang it... Sorry Ma, Pa... I'm finally gonna do it. I'm gonna use ma strength to hurt another thing. On purpose."
"Oh, this is gonna be hilarious." Ashmodeus laughed.
"...You monster... THIS IS MA TOWN, TOOOOOOOO!" Big Mac yelled, rushing forwards.
"Oh, that's adorable." Ashmodeus sneered, intent on taking the attack without flinching.
And then Big Mac crashed into him and kept running, carrying the red-maned black stallion away while red flames rushed out of his body, scorching the ground.
"DAAAAAANG IIIIIIIIIIIIT!" Ashmodeus shouted. "Is what I'd say if I couldn't do this."
Ashmodeus wrapped his tail around Big Mac, crushing his neck in a second.
The larger pony fell to the ground, useless, and Ashmodeus landed on his rear. "I meant to do that." Ashmodeus said.
"Black Blade!" Ashmodeus yelled, forming his sword of black flames and burning Big Mac into nothingness.
"Big Mac!" Applejack yelled.
"What was that?" Ashmodeus asked, laughing. "What even was that?"
"He did that on purpose!" Twilight thought, realizing it. "He wanted to make sure we could get Rainbow's body!"
Twilight's magic drained more energy from Oak, but he closed his mouth, not wanting to give anything away even as it felt like a hundred supernovas were being shoved into his eye sockets.
Finally, it stopped, and Oak fell to the ground as Twilight's overflowing magic healed the bleeding Rainbow Dash, skin and blue fur growing over the winghole left behind.
"Big Mac... You might not say much, but there always was more to you than met the eye." Twilight thought as Rainbow Dash got back up.
Pinkie rushed over to her and carried her back to Twilight. "Mommy... I'm sorry. I didn't want to be slow any more."
"I'm not your Mom." Pinkie said quietly, not sure what to say now that it wasn't time for joking around.
"Finally... We're all back together." Twilight said, as the six Elements of Harmony got ready to face down Ashmodeus - Except for Rainbow, who just stared into the distance.
Twilight activated Rainbow Power, and they all transformed. Rainbow grew back her missing wing, and her broken hoof, and she suddenly felt way better. She joined her friends in staring down Ashmodeus, hating him now more than ever.
Oak stared at how beautiful they were, especially Twilight, Pinkie, Rainbow, and sweet, sweet Applejack. The other two looked kinda dumb. He wished he had an awesome transformation of his own. 
"OOOOOOHHHHHHHHH!!!" Ashmodeus shouted. "It's happening! You six, you're the ones destined to kill every last one of the Shadow Dragons, aren't you?"
"What?" Oak asked, surprised.
"That's right... Every last one!" Ashmodeus said, smiling. "They're going to destroy us all."
"That's a lie!" Applejack yelled. "We'd never hurt Oak!"
"And when Twilight tortured my little brother Nixhilus with that spell of hers?"
"I AM NOT YOUR BROTHER!" Oak shouted. "And she was draining my energy, so we could pull this off!"
"Really? Dang, and I thought you'd finally found yourself a mare with a backbone. Oh, who am I kidding! You couldn't get a mare if she didn't have any bones left in her body!" Ashmodeus laughed.
"Laugh while you still can! With this power, we can finally defeat you!" Oak yelled.
The six ponies floated together and shot a huge rainbow beam at Ashmodeus, who dodged. But Oak was faster, and he punched Ashmodeus back into the beam.
"Why, Nixhilus... Why would you do this to your own brother?" Ashmodeus asked as he fell back into the rainbow beam.
"You're not my brother... AND MY NAME! IS! OOOOOOAAAAAK!" Oak yelled, firing his own purple beam from his mouth into the rainbow explosion that grew bigger and bigger before finally exploding, making everything white.