Moondancer & the others followed and entered Twilight's house. They, though mostly Moondancer, oohed at the inside, which was filled to the brim with books, though there weren't as many as the library. Twilight ran up the stairs and brought the table from the kitchen, followed picking up some books on said table.

"Alright," Twilight spoke as the rest gathered around the table "according to these books, it's stated that a thousand years ago, Princess Celestia wasn't the only ruler, but ruled alongside with her sister, Princess Luna."

"Princess Luna?" Twinkleshine asked

"I've heard about her." Lemon Hearts replied "Sometimes, whenever I pass by Celestia's room, she's talking to herself and apologizing to somepony named Luna."

"What did she say?" Minnuete asked

"I didn't pay much attention, but I actually heard her sing what sounded like a lullaby last night. I couldn't hear it all, but Celestia sounded really sad, almost as if... wait! Did she knew about this all along!?"

"Is that why she needed you to go to Ponyville?" Lyra asked

"I don't know!" Twilight retorted "I've never seen Celestia panicking before! Heck, when I was enrolled and had a magical surge that made Spike into a giant dinosaur & my parents into plants, Celestia calmly approached me instead of running and screaming."

"...So she hoped you'd leave for the Summer Sun set celebration instead of celebrating my birthday?" Moondancer asked

"I don't think so. In fact, I was about to send her a letter regarding Nightmare Moon's return."

"That other Alicorn was Nightmare Moon?" Twinkleshine asked

"Yes, but more importantly, it's Luna."

"What!?"

"Getting back to the subject; While the two sister ruled the land, Luna watched as everypony played & flourished in Celestia's light while they slept through her beautiful nights. Tired of being ignored, Luna turned herself into Nightmare Moon, but was banished to the moon by Celestia using the Elements of harmony."

"Elements of Harmony?" Moondancer asked "I've heard about them!"

"Really?"

"They're in the children's section in the library."

"And how do you know that?" Lyra asked. Moondancer froze and looked around, her cheeks blushing.

"Uh... research."

"~Sure~." Moondancer shook her head and cleared her throat.

"Anyways, the elements are, as I can remember, are Laughter, loyalty, honesty, generosity, and kindness."

"Sounds easy enough." Lemon Hearts commented

"It would, but we saw Nightmare Moon using SIX of those things! I'm just wondering what the sixth is, but more importantly, HOW is she using them!?" Everypony looked around in confusion. Twilight lifted some books and quickly skimmed through them.

"I have no clue." Twilight spoke, placing the books back onto the table. She groaned and placed her head on the table "I kinda wished I actually sent that letter now."

"...We know you were guilt tripped by Spike," Lemon Hearts replied "but why didn't you send her the letter while going to Moondancer's party?"

"Eh, again, Spike told me that I was sounding like those stallions that yelled 'it's the the end of the world!' last year." They turned their attention to Spike.

"What!?" the baby Dragon asked "If you were in my spot, you'd do the same thing, right?" The ponies grumbled to themselves in agreement.

"...Maybe she's not inherently evil." Twinkleshine spoke. Everypony looked at her with confusion "I mean, she's still Luna, right? She was just mad at her sister and probably felt lonely. Technology had advanced, so if we can show her the changes that will appeal to her, then she may just listen to us and let Celestia come back. Sounds like a good plan, right?" They looked at each other and murmured.

"Maybe," Minuette spoke "I'm certain she isn't inherently evil either, but I don't think she's going to listen to all of us."

"She only needs one of us to do it! And we already know who." Twinkleshine pointed at Lemon Hearts and everypony stared at her. Lemon Hearts looked around, realizing what Twinkleshine meant.

"Oh no!" she retorted "There is no way I'm going to Nightmare Moon and show her how we've changed!"

"You won't be alone," Twilight said "because I'll be there with you."

"Oh thank Celestia! Now I won't-"

"I'll talk to Nightmare Moon myself and you look for the Elements of Harmony."

"But I thought we were-" Twinkleshine spoke

"Your idea sounds pretty good, but if it fails, we need a plan B. When Lemon Hearts finds the elements, we're going to take it away from Nightmare Moon and hide here. I'll look for something that will spark the elements again, blasting Nightmare Moon again and send her back to the moon."

"But how do we know if the elements will blast Nightmare Moon to the moon again?" Lyra asked "And what about Celestia?"

"... I'm not sure, Lyra, but I will do whatever I can to bring Celestia back. If all else fails, then somepony may need to be in power soon, or else Equestria will fall into chaos."

"Let's just hope everything will go right," Moondancer spoke "or else this will TRULY be the worst birthday ever."

"And I'm here to help!" Spike announced, puffing his chest to look bigger "Just tell me what to do and I'll do it! Anything to save Equestria from eternal darkness!"

"...There is one thing you can do." Twilight replied

"Tell me and I'll do it!"

"Go to bed." Spike frowned at it.

"Aw, but Twilight-"

"I'm sorry, Spike, but this is dangerous and it's almost past your bedtime."

"Twilight, it's only 5."

"I got this." Moondancer spoke. Her horn glowed and a spell was casted around Spike's face. He yawned and he started to grumble.

"I'm... not... tired..." He fell onto the floor and snored.

"That should do. What do you want the rest of us to do, Twilight?" Twilight stared at the four.

"... I think I have something," she spoke "Moondancer, you find the spell needed to use the elements of Harmony."

"There's a library inside the Canterlot castle that may have it." Lemon Hearts spoke "She may need to come with me to access it, though."

"Good. And the rest of you three... I got nothing."

"Aw!" Lyra complained "Not even a little thing?"

"If it involves Humans, that won't help." Minuette commented

"Hey!"

"We can help." Twinkleshine spoke "I'm sure I-

"Just make sure Spike is safe, okay?" Twilight interrupted. The three groaned.

"Yes ma'am." They spoke in unison.

"Good. Let's do this! Lead the way, Lemon Hearts!"

"Just follow me." Lemon Hearts spoke, leading the three out. As soon as the door closed, Twinkleshine placed the snoring Spike back into his basket.

"Too bad for them," Minuette spoke with a smirk "we never Pinkie promised."

"...What are you getting to?" Twinkeshine and Lyra asked

"Easy as this; Lyra, do you still have your Lyre?"

"I always carry it with me." Lyra answered

"Good, and Twinkleshine, you still have your singing voice?"

"It's still with me." Twinkelshine answered "But what are you doing?"

"Twilight still needs our help. Plus, have you seen Nightmare Moon's teeth!? She needs somepony to help her with that! Somepony who's also a dentist." The two's pupils shrunk.

"Oh no!" Lyra yelled "You're not going to use... her!?"

"I'm always afraid of that accent!" Twinkleshine whimpered.

Nightmare Moon sat in the throne room as the batponies cheered for the return of their princess.

"Yes, my children of the night," she spoke "your princess of the night has returned, and the reign of Celestia has ended!" More cheering. "These ponies will soon learn that there's nothing to fear from the dark, but only to fear the one causing darkness! Such as these pitiful ones that stood up for their 'leader'!" Falling from the roofs & dangling on chains were Canterlot soldiers, still in their golden armor and cramped together.

"You'll never get away with this!" Shining Armor spoke from one of the cages "Somepony's going to stop you!"

"Ha! That'll be the same day that one of you feels comfortable in your cage!"

"...I'm comfortable!" A lone guard shouted.

"Uh... except him! He's... an earth pony! You need to be a unicorn or a pegasus!"

"That's racist!" Another yelled

"I'd say it's rather species-ist." Another spoke "Doesn't that go with a human thing?"

"You've been hanging out with Lyra again, haven't you!?" Another asked

"Shut up! She's cute!"

"Cute, but dumb."

"Just like you, Mac!"

"I'm P.C! That's Mac!"

"I'm not Mac, I'm checkers!"

"I'm yu!"

"You're not me!"

"Yes, I'm Yu!"

"Are you deaf!?"

"No, I'm blind in my left eye"

"ENOUGH!!!" Nightmare Moon yelled. She pointed at a lone batpony guard "You!"

"Yes?"

"Not you! Him!"

"Me?" The batpony asked

"Yes, you!"

"I'm Mi."

"He's Mi," the guard continued "and I'm Yu."

"And I'm about to kick you plot to the sun, smarty pants!" Nightmare Moon yelled

"That's my sister's doll's name!" Shining added. Nightmare Moon grunted to herself before sitting down on her throne.

"Just be quiet!!!"

"... My name is Quiet!" Another soldier yelled

"Why did I show them here?"

Author's Note

I don't know what's the other name for batponies. Plus, more comedy will come in the next chapter!