I told you to go right

Just as we reached the bridge-gap, I felt a burden release from my sides. My wings felt free again, and I happily gave them a few flaps. Giving a quick glance over my shoulder, Twilight gave me a wink. Crikey! She had a change of heart! my mind yelled in an Australian accent. I gave the lavender unicorn a nod in return and continued to stretch my wings. The contractions of the wings was intoxicating, like that feeling you get after you've been in a car for too long and you get out. I trotted forward to the edge of the cliff, and then at the other side. The rope bridge on our side was gripped in Rainbow Dash's mouth as she flew over almost without question. A rainbow trail was following the mare as she darted to the other side. Almost casually, the cyan mare landed on the opposite side of the ravine, rope gripped in teeth. I immediately felt compelled to follow, but I saw 3 figures on the other side practically ghost into existence.
"Who are they?" I heard Applejack ask.
"I think this is a trap." I replied. "I doubt 3 pegasi can spontaneously appear without the use of magic; this is clearly a trick."
"Wait a minute..." Twilight suddenly said, stepping forward. "I think...they're trying to stop her from raising the bridge!"
"RAINBOW! IT'S A TRICK!" Applejack shouted over. We all pitched in; shouting for her to ignore them and to raise the bridge. As though it were moving to intercept our shouts, a thick bank of fog spontaneously appeared in front of us.
"Dammit!" Sky shouted, slamming a hoof on the ground. "She'll never hear us!"
"I say one of us flies over and...'removes' those creeps from the equation." Inferno Cloud grunted. Almost all eyes turned to Sky, who turned out to be looking at Inferno, so all eyes turned to him, who was looking at Fluttershy, so all eyes turned to the mare who was looking at you-damn-well-know-who. Sighing, I spread my wings, removed my jacket, before flitting over there. I disappeared in the fog for a few seconds, as did everything else. After all, flying through a cloud generally has this thing of reducing your visibility to zero. Suddenly, muffled voices ahead.
"...if you fix that bridge, you can't join the Shadowbolts!" came a female voice. I increased my speed with faster wing flaps, which in turn cleared some cloud cover. Through the layer of clouds I could partially see through, Rainbow was visible once again. I rapidly looped, before landing beside her.
"Rainbow!" I panted, out of breath from flying quickly. "It's a trick! Don't listen!" Rainbow Dash turned and looked at me, pink eyes looking for a hint of insanity again. When they found none, she listened.
"There's no such aerial group as the Shadowbolts. Think; why would three pegasi conveniently be in a forest, and know everything about you? Look, we need the bridge, Rainbow. Trust me." I fiished my speech by pointing a hoof at the bridge supports. Dash looked torn between two things; the fake chance of a lifetime, or becoming a powerful entity of friendship? After a few seconds, Rainbow turned to the Shadowbolts.
"Sorry," Rainbow smiled. "Love to join your group, but I have to attend to my friends." And with that, she turned tail, put the rope in the holder, and tied it off. A growl came behind, as there was a flash when the three 'pegasi' disappeared.
You foal.
Ha. Awesome, one, Goddess, zero.
You win this time, but when you reach the inner chamber you'll regret your victory.
I'm sorry, what? I can't hear you over the sound of my awesome.
Hmmmm...
Whatcha thinking about, Luna?
Oh, just thinking of your 'punishment' for your treachery.
Sex?
Possibly. If you're lucky. Tee Hee.
Awww, you're so cute when you giggle. Do it again, pleeeaase?
I might do more than just giggle whilst I punish you. Tee Hee.
Awwwww! That's fucking precious!
More where that came from, if you join me.
Nah. Tempting, but just Nah.
Very well. I look forward to our confrontation in a few minutes.
As do I. Can't wait to see how beautiful you are underneath that armour and darkness shit.
Good to speak once more.
Likewise.
"What's up?" Pinkie Pie asked, snapping me out of my trance.
"Oh, Nightmare Moon just invaded my mind because I beat her plan. She claims to be inventing a 'punishment' for us all when we lose. But that won't happen, will it, you guys?"
"NO!" the others shouted back.
"What are we gonna do?"
"BEAT MOONY!"
"And when?"
"NOW!"
"Then LET'S GO!"
This was it. The final run. All twelve of us charged into the castle, roaring battle cries as we cleared corners, leapt pillars, and ran up stairs. We were going to win, nothing could stop us.

One stamina loss later...

Who knew we'd tire so easily? Most likely Nightmare did, because I swear to Faust we'd been climbing these same stairs for 5 minutes. None of us had the stamina to keep running, so we all just trotted slowly, trying to catch our breath after an insane adrenaline rush. The stone steps were occasionally punctuated by moss, cracks, or at some points missing steps entirely. I still had no clue how such a peaceful world would have things like fortresses. There were arrow slits lining the walls: why would Equestria need Archers?
"Wow," I said, breathing heavily. "I feel like flying up these stairs right now." Suddenly, every Pegasus in the group, Rainbow, Fluttershy, Sky Wheel, Inferno Cloud, and me all simultaneously facehoofed. "I feel like a bit of a dumbass now."
"Yeah," Twilight groaned at her own mistake. "I could also have teleported us there." Everypony's pupils shrank at that exact moment.
"Well, let's do that." I said, my eye twitching slightly. Twilight nodded, charged her horn, and we experienced a bright flash of brilliant purple light. I felt nauseous for a second, but that passed quickly. When my eyes stopped being blurred, I took a gander about. Stone floors cracked beyond belief harboured a large number of weeds that entered the chamber through ever crack and crevasse. Vines tumbled in through the windows using sheer pressure and time as their entry method. Darkness still reigned outside, another castle visible through the low mists. The whole vibe of this chamber seemed incredibly eerie, as though something happened a thousand years ago that still haunted the place. Dead centre of the room, however, was what we had come for. Small stone spheres around the size of footballs (Or Soccer ball, if that's your thing), each emblazoned with a simple symbol. All 5 stood on individual pedestals, awaiting their time to (literally) shine.
"Well, here we are guys." Twilight said, sounding quite relieved. I saw a lavender aura appear around the unicorn's horn and the Elements, as all five rocks floated in formation towards her. She carefully set them down, so as not to create so much as a chip. It all seemed rather surgical.
"But there's only five!" Pinkie cried, bouncing up and down next to Twilight. "You said there was six!"
"Well, the book said the sixth element would appear when all five were present. All they need is a spark, that's all. Step back everypony, I don't know what's going to happen."
"I think some of us should head to the other castle." I quickly said. "Y'know, just in case she teleports you there and you have to fight her alone?" I received some dodgy looks for that statement. "Fine, I'll go alone. But I fight her alone, you owe me 20 bits."
"What?" Twilight responded, horn still aglow. "I won't give you money!"
"You shit on floor, you give me 20 euros." I smirked back. The inBetweeners references are almost always fitting.
"Just...go..." Twilight groaned.

"Suit yourself." I smiled back, spreading my wings and taking off quickly. I did a loop, flew to a window at speed, before shutting my wings to dart through the gap. Once on the other side, I rapidly soared over 500 metres to the other castle.

It was dark in the other castle. It's possible that's just how Moony has it, but probably not. Torches did almost nothing to light the corridors, just barely being able to light a 1m x 1m square around themselves. All I knew was that I stood out quite a bit in the dark; bright blue and gold tends not to be the best camoflage. I couldn't help but 'wow' as I entered the main chamber. This one was even bigger than the other castles chamber. Huge cigar-like pillars rose around 50 metres up, to a ceiling made up of a large chapel-like roof. Smashed stained glass windows were lining the long side walls, whilst at the end was a giant one. The floor was dark, the roof was dark, the walls were dark, everything was dark. But, since this was a cartoon, I could see quite easily that Nightmare Moon was not here. I did know, however, that Twilight would be here soon, so to pass the time I sat on my haunches as I sang 'Bassline Junkie' by Dizzee Rascal.
"...big dirty stinkin' bass, dirty stinkin' bass...~~" I sang, the echoes spreading throughout the entire castle. If the show was accurate, as it has been so far, Twilight should appear in several minutes. I used these to my advantage; I flew to a decent position where I could land on Nightmare, I smoothed through my fur, mane and tail, before preparing a ready stance. Finally, I would face the legend, alongside characters I thought were fictional.
This was it.