Usually she'd put comparatively little stock in millennium-old legends, but this is a primary source, and the authors made some correct predictions on other matters, and the translator is good, and she double-checked to make sure the page numbers matched up so no one has been pranking her with inserted extra leaves. And the prediction is fairly dire.
And it's rather short notice.
Clarity tucks the book into a saddlebag and trots up to the main section of the palace. She can usually get an audience fairly quickly; Celestia has taken a particular interest in her since her admission to the School for Gifted Unicorns. This day is no exception. In fact, the guards usher her in even quicker than she'd usually expect.
"Princess, I have something urgent to tell you," Clarity says, mid-bow.
"Oh? What is it, Clarity?" inquires Celestia.
"I've found a prediction stating that on the longest day of the thousandth year -"
"Clarity," sighs Celestia.
Clarity grits her teeth; she's never told Celestia not to interrupt her. You can't tell the princess that. "Yes, Princess?"
"I have the utmost respect for your diligence at your studies, but you've got to take your nose out of those dusty old books now and again," says Celestia with a warm half-chuckle. "There's more to a young pony's life than studying. You're in the prime of your life, you're coming up on the end of what you can learn from school -"
Clarity stands up on all fours, no longer bowing, jaw slightly open.
"And," continues the Princess, "you need to make some friends. I worry about you all alone, you know. Weren't you invited to that party - who was it, Moondancer?"
"Yes, I was invited, but I barely know her," says Clarity.
"Perhaps the ponies around Canterlot just aren't clicking with you. You know what," says Celestia, as though seized with sudden inspiration. "I'm going to give you a job to do."
"...a job, Princess? But what about the longest day of the thousandth -"
"Clarity," says Celestia again, and Clarity shuts her mouth. "Don't you worry about it. I'm sending you to supervise the preparations for the Summer Sun Celebration. It's being held in Ponyville this year. I'll arrange a carriage for you. Pack your things, you leave in two hours."
"I..." Clarity can't really gainsay her. "Yes, Princess."
Celestia smiles.
Clarity bows again, and leaves, and packs.
-
She's in the air, drawn with her luggage in her carriage by someone in good condition for a long-distance flight - they're still working on that train line.
She steps onto the main street of Ponyville, laden with all her possessions in her saddlebags, and levitates her to-do list in front of her nose.
"Okay," she sighs to herself, peering at the first item. Clarity is pretty sure Celestia has read every book in the palace library at least once; probably she investigated the danger well in advance and dismissed it. (But Clarity will be staying in a library while she's in Ponyville, so she'll have a chance to double-check and find corroborations once she checks out the Summer Sun Celebration preparations.)
"First," Clarity mutters, "banquet preparations. Cheery Cherry Orchard."
"Whoa, a new pony!" he exclaims. His look of startlement transforms into a grin; he presumably can't help the moderate amount of fang involved. "Hi, new pony! What's your name? Where you from? What're you doing here? I'm Joy. I know everypony!"
"This way!" He commences leading her down the street, towards the edge of town. "It's not far. And they have the best cherry pie in all of Equestria. So you're from Canterlot? Me too! Well, I grew up there, anyway. I live here now." He gestures around at the buildings of Ponyville. "I like it here, but sometimes I miss seeing new ponies every day. So I'm sorry if I'm coming on a little strong here. If you want me to slow down the constant yammering, just say."
"There's also a little problem with momentum - it's more complicated to cast the spell if I'm moving and I can't land with momentum attached to me at all. Obviously Celestia can teleport any way she likes, but it's a worthwhile exercise to figure out the details myself as long as I don't need to do particularly sophisticated teleporting for some kind of emergency."
"Hey there!" she says affably. "Cherry Cordial, at your service. What's your business in Ponyville?"
Just outside the farmhouse, a neatly arranged grid of trestle tables stand covered in neatly arranged food. Clarity might be relieved to note that not all of it appears cherry-based. The table nearest to the house has a clipboard hanging on a short string from one end; Cordy gestures at it with a hoof. It has a chart of all the available kinds of food, with projected and actual quantities recorded; there are three fewer cherry tartlets than the goal of 50, but all other discrepancies are positive. Only two rows at the bottom remain unfilled: cherry chocolate truffles (goal amount: 80), and chocolate chip muffins (goal amount: 60).
Cordy nods. "If you head back to the road and turn left, away from Ponyville, then keep on going down the main road until you see a side road on your right opposite a pond on your left, rehearsals should be a little ways down that side road. I can get that written down for you if you prefer."
The rehearsals are taking place at a stately old tree just past a low hill; the birds perch in the branches, while a grey pegasus with a bi-coloured silver mane sits beneath the tree and plays her violin. This must be Silver Streak. She's very good.
Clarity looks down at her front to see if there are crumbs or bits of dressing in her fur, but sees nothing. "Uh? ...Next I'm planning to look in on the decorations, to give whoever's clearing the sky extra time to get it done before I'm breathing down their mane." She peers up at the sky; it's not exactly crowded with clouds, but it doesn't look cleared.
"That would be my sister Brightblaze. When you're done inspecting the decorations, you'll find her in the tower on the far side of town, immersed in some project and having thereby forgotten what time it is and possibly what day. But it will not take her long to clear the sky, so as long as somepony reminds her with a few minutes to spare, all will be well."
The town hall looks pretty decorated! Appropriate sun symbol banners are hung from hither and yon, and streamers and crepe paper are strewn and elaborately knotted around other things, and the unicorn who seems to be handling this is in the process of arranging flowers to tuck into convenient loops of ribbon left when the bows were tied. "Oh! Hello!" she exclaims when Clarity approaches. "I'm Guiding Star." She slots a bouquet of camellias into a bow and cinches it up, then nods at her work and lets the golden magic fade. "You must be Clarity! Joy said you were going to come check things over. What do you think?"
"Well, all the bows are getting flowers. Do you think we've gone overboard on the colors? The florist thought we were going overboard on the colors. The idea is that the main color in every bunch of flowers matches its ribbon and the others complement it, and as you can see the ribbons are arranged in rainbow order."
"Well, it takes a little while to cast, and then I get a picture of a likely future around wherever I'm going to be or sometimes somewhere else if I try really hard! It's basically 'the future if everything goes according to plan', I think, but I've never had a serious magic-type pony go over it with me. It can get thrown way off if somebody makes a choice that wasn't just about decided on when I cast the spell. Joy's trying to tone down his wackiness for the day so I can use the spell to see how the decorations will turn out before we invest all the labor in putting them up, but usually he throws me way off, and other ponies can too."
"Yep, everything looks great, except it looks like I was at risk of confusing the roses and the daisies, whoops! I'll just put those up right now in their correct places." Guiding trots out and then back in, a bouquet of each in tow, and tucks them into their ribbons one and then the other. "Oh, if you wanted to know, the choir goes up there on that balcony, and the catering tables are over there."
And off she trots, following Silver Streak's directions to her sister's place to issue a reminder about clearing the sky.
Just as Streak promised, there is a tower on the far side of town, some distance down the road from the main cluster of buildings and set a little ways back from the street. As Clarity approaches, mysterious sounds emerge: clanging, clinking, and a crackling whoosh almost like a strong wind.
It takes about ten seconds to get them all. Then Blaze arcs down toward the front of the tower, brakes by pointing her hooves at the ground, turns off the boots, and lands beside Clarity in normal pegasus fashion.
"What'd I tell you?" she says, grinning.
"I'd have to make you your own set, anyway, the other problem is that I need my special talent to operate them - I deal really well with fiddly little things," she explains. "I guess you could use magic or telekinesis or something but these ones," she taps a hoof against the ground, "are designed to work purely by hoof. And they're very fiddly."
As someone who is often mistaken for some sort of musician based on the bell stamped on her flank, Clarity decides not to ask how exactly a flaming lightning bolt represents fine dexterity.
"Unfortunately I was interrupted by the errand so I don't have much to go on. Key words include -" Clarity produces her current notebook. "Mare in the Moon, or, Nightmare Moon; and the Elements of Harmony." What kind of classification system is this? It doesn't seem to be arranged by author or in subject groupings. Is this literally alphabetical by title? Wow.
"The last librarian organized it. But then she moved to Manehattan. The shelves that are alphabetical by title are because there's no author recorded for those books; if you start over there," she points a hoof, "it's nonfiction alphabetical by author, then fiction alphabetical by author that stops over there and starts again up there on the next floor, then a bunch of things that Page Turner never got around to filing properly in no particular order on that shelf way up there."
Okay. Six Elements of Harmony, only five known: laughter, generosity, loyalty, kindness, honesty. Known to whom? The unspecified author of this book, apparently. Oh, hay, why didn't the Princess listen to her? The other book said she used the bucking things. She could probably list them all, and tell Clarity where they were, in less time than it had taken to chide her and tell her to make friends. And then Clarity would at least have an idea of what to do if some disaster did happen to occur at the Summer Sun Celebration.
Oh, this book knows where they were last seen, apparently. Last known location, palace of the pony sisters, located in what had become by the time of this book's publication the Everfree Forest.
Eeugh. Clarity has heard of this forest; it is no doubt serving useful ecological purposes, but it isn't exactly a comfortable prospect for traveling through.
Celestia was unworried; the elements sound vaguely from the language of this book like they might require special status of some kind to use at all; and if they were that important Clarity vaguely doubts they'd have been left to decay or crumble or undergo whatever deterioration process applies to the unspecified material in a disused castle. So she decides they're probably not worth running out to fetch right now. She might not make it there; she might not need them for anything; if she did she might be unable to handle them to any useful effect; and they might not be all they're cracked up to be. But she feels better for having been able to consult the reference and is glad she left time for it.
"I guess the library would have to stay unstaffed for quite a while to still have the position available in a few years, though." Clarity locates the disorganized shelves and scans them in case there's something else Elements- or Mare-in-Moon related but finds nothing.
When the time of the celebration approaches, a pink earth pony with a green mane comes to collect her. Blueberry puts her book away and trots up to her with a happy cry of, "Hi, Clover!", then follows her to the town hall.
It is crowded, the food is tasty, everypony in town is mingling, the choir stands ready, and the sky is still completely clear to allow proper viewing of the sunrise. The decorations are finished and the curtain is down to allow proper dramatic reveal. A mare who must be the Mayor is standing by it to present Celestia at the correct moment.
"Fillies and gentlecolts, as mayor of Ponyville, it is my great pleasure to announce the beginning of the Summer Sun Celebration!" cries the mayor. "In just a few moments, our town will witness the magic of the sunrise, and celebrate this, the longest day of the year! And now, it is my great honor to introduce to you the ruler of our land, the very pony who gives us the sun and the moon each and every day, the good, the wise, the bringer of harmony to all of Equestria... Princess Celestia!"
That's the cue for the songbirds, and for the drawing of the curtain.
This time Clarity doesn't answer fast enough to suit her.
"Remember this day, little ponies," laughs Nightmare Moon, "for it was your last. From this moment forth, the night will last forever!"
She cackles, and thunder echoes across the cloudless night sky.
Clarity forces herself not to break into a canter that will guarantee her a timewasting trip over her own hooves as she makes for the exit. She doesn't know any part of Ponyville well enough to teleport there without looking straight at it in better light than that of the stars and the suddenly blank-faced moon, so on hoof it'll have to be. She doesn't know for sure if the contents of her saddlebags are going to be useful in the Everfree Forest - actually, she'd put her bits on 'no' - but while this is an emergency, it is not an emergency on a scale of minutes and so she's going to go ahead and take the precaution.
"Nightmare Moon equals Mare in the Moon equals banished sister of Celestia, could theoretically be defeated with five mysterious and one extra mysterious objects that can maybe be found in an old castle in the Everfree Forest," Clarity recites, not breaking stride.
"And you mean to go get them? Sounds reasonable. I'll help plan the expedition," says Cordy. "We should bring Guiding Star and Silver Streak for informational purposes, and Brightblaze would be good to have along in case of trouble, plus there's no way she'll stay behind if her sister is going."
"You saw Streak's cutie mark? She answers questions," says Cordy. "Solves mysteries. Finds out facts. If we find the Elements of Harmony and can't figure out what to do with them when we get there, it's a good bet she'll be able to offer some insight. And I'm sure you've seen Blaze fly, when she cleared the sky; those boots of hers will be good to have around if it comes down to a fight of some kind. As for large predatory animals - I did say I can communicate with anything."
"Okay, you can all come if you want, but - at your own risk. I feel bad enough that I didn't successfully get Celestia's attention with my warning; I'm sure you all know, living right here, more about the forest than I do, but still." Here's the library; Clarity opens it up and collects her saddlebags.