The Canterlot dungeons; dimly-lit, dirty, humid and generally quite unkempt. It wasn't Celestia's fault, honestly. She hadn't had to house anypony in here since the last major thieves' guild was disbanded...three hundred years ago. Now, the dungeons housed only two occupants: her nephew Blueblood, due to be released (ugh) tomorrow, and the Changeling Queen, Chrysalis.

"Chrissy, dear, I'm hoooome!" Discord called into the dungeon's depths, completely annihilating the dark calm that usually settled over the room. In the dim light, a pair of reflective green eyes opened, and a dark figure shuffled forwards.

"Discord? What in Tartarus do you want?" Chrysalis snapped, remembering the irritating spirit's last "visit" to her cell.

"Oh, but my dear former queen, it's not (currently) about what I want from you, it's what Princess Sparkle wants from you," Discord uttered, a positively Cheshire grin on his face. With a snap of his talon, the aforementioned Princess, followed by Celestia, were teleported outside of Chrysalis' cell. Celestia kept her face neutral, for the sake of formality, but Twilight had no such desires and immediately frowned upon seeing the Queen.

"Changeling Magic. How does it work? I wish to know," Twilight said, getting straight to the point.

"That's awfully forward of you, Princess," Chrysalis snarked. "I should think you could at least try to ask nicely."

"I could, but that would require being nice to the creature that attempted to dethrone my mentor and enslave my brother."

"Touché."

"Just answer the question already...please."

"Alright," Chrysalis began. "Changeling Magic doesn't function much like Equestrian Magic. Whereas you ponies have to focus and think carefully about how your Magic will form, Changelings can simply will their Magic directly into an effect. This means that, sadly, our Magic is somewhat limited; we can only perform one task at a time, and no task at all if it has more than one or two steps. I can cast a fire spell and a shield spell at the same time, much like a Unicorn, but sadly that is it. If I were to attempt a third spell, the first one I cast would simply fail to continue. As well, our Magic has a natural predisposition towards shapeshifting and illusory magic. A changeling can will themselves to copy any form they have seen with their eyes at any point in time, and we have an excellent memory."

"Ooh, special eyes," Discord interjected, a pair of silly glasses appearing on his face. "I have special eyes, too, see?"

Chrysalis gave him an unamused glare for interrupting her, but at the same time knew that agitating the Spirit of Chaos was generally not a good idea. She continued.

"All changelings have a green Magical Aura because we are all the same entity. We share a soul. That is why we are able to communicate so quickly; our minds are shared to an extent, so that thoughts addressed to each other can be shared instantaneously. We are not mind-readers, no, we are a Hivemind," Chrysalis finished.

"Hmm..." Twilight hummed, once more lost in thought. "Chrysalis, thank you for sharing."

"It's not as if I had a choice in the matter, is it?" she mused.

"No, not really."

With a flash, the three entities appeared back in Celestia's study.

"Twilight, did you learn anything?" Celestia asked, ignoring how Discord had miniaturized himself and was wading through her ethereal mane like a pool.

"I do believe I did, Princess. Who knows? Maybe I can reverse-engineer the concept of changeling shapeshifting to find a way for normal Unicorns to replicate its effect!" Twilight said, her voice steadily growing in volume.

"Before you do that, Twilight, can I just say something?" Discord asked.

"Erm, I guess?"

"Next chapter!~" Discord shouted, as everything faded to black... Next Chapter: Fluttering Estimated time remaining: 5 Minutes