A My Little Pony: Friendship Is Magic fanfic by Chrono_Ryono.Stressed by the growing rift between herself and her sister, Princess Celestia confides in her brightest student of the era. That fateful night, the legendary battle between sun and moon shakes the foundation of Equestria. But, what brought them to that point? And, after the fact, are the repercussions merely the prelude to something even worse?Originally posted as the one-shot As Night And Day, it has since been continued as Whispers and focuses on Arcanus, Celestia's brightest student of the era.It can be found here.
This fanfic provides examples of the following tropes:
Contrived Coincidence / The Magic Poker Equation: Moonthistle's approach to intelligence gathering at the Pony'borough card table is to mention Princess Luna with varying levels of respect and gauge the other players' reactions. Naturally, she is dealt exactly the ammunition she needs to make this believable: the queens of clubs and spades, which both depict Luna and allow her to win via two pair.
Crazy-Prepared: Moonthistle's saddlebag, which seems to contain a wide variety of tools for all sorts of scenarios.
Moonthistle: "Ever find thyself thinking, 'gosh, this'd be so much easier if I had a screwdriver?' I made a list."
Moonthistle somewhat resembles Applejack (down-to-earth, straightforward thinking) crossed with Pinkie (perpetually upbeat, doesn't take anything seriously).
Fantastic Racism: The unicorn-dominated nobility seems to drifting back to this. Lord-General Ixion in particular is referred to as an infamous "closed-minded unicorn supremacist."
Hard-Drinking Party Girl: Moonthistle is outright referred to as a "hard-drinking partygoer" in chapter 7, and she lives up to it by drinking too much wine and flirting with both her best friends and strangers.
Inferiority Superiority Complex: Aurora has developed one of these due to being stuck in her sister Belphegor's shadow. It's possible that her snark toward Moonthistle is a manifestation of the superiority half of the equation.
Moonthistle doesn't usually act this way, but does have the skill to slip into the act on occasion. She casually levitates a plate of food and wine, setting them to orbit around her head in opposite directions, occasionally stopping one to take a sip/bite without affecting the other, all without needing to pay attention.
Moonthistle's water spell in chapter 8 is called Hydro Pump.
The random terms Arcanus rattles off while reading the history book are mostly references to other fiction, including Amdusias and Tantarian and Dirt Dragon. The quoted song Back in Time is also reference to Sonic R.
Thicker Than Water: Celestia compares Arcanus's rocky relationship with his brothers to her own relationship with Luna, and reminds him that "for better or worse, your siblings are all you'll have someday."
Title Drop: Appears to be a recurring theme, as all chapters are named after a phrase contained within.
The title of the story itself, Whispers, is dropped in chapter 5.