Huh.
An alicorn I don't recognise stands a little closer, watching Sunset with…
"Circe?"
Because
of course she'd be an alicorn. Immense magical power? What else?
She turns my way. "Grayven. You didn't tell me that this was happening today."
"Fifteen to one time ratio." Green pelt, pink-purple mane and tail and staff whose head is glowing with arcane power as a cutie mark. No, hang on: there's a broken and rusted sword underneath it. "And the timing is Sunset's decision. How did you-?"
The staff is an obvious choice. But a broken and rusted sword? Symbolic of intellect overcoming strength of arms?
"Jean anticipated your order."
"Ah." I nod. Hadn't realised that she was awake. I suppose that one of the g-gnomes probably notified her.
It's only what, early April 2nd? It shouldn't have been too much trouble.
Sunset glances towards the door as Celestia and Luna come inside, Celestia hanging back slightly while Luna trots up alongside me.
"Grayven, will you introduce us?"
Hmm... Is Celestia finally starting to let Luna be more active in leadership, or just concerned for Sunset's safety?
"Princess Luna, this is Circe." I frown slightly. "Do you bother with titles?"
Circe sighs. "With an introduction like that I can hardly do so now." She smiles at Luna. "A pleasure to meet you, Luna."
They'd be a waste of breath anyway. Has Circe really bothered with such things before, outside of impressing
simple folks?
"And what is thine involvement in this affair?"
"Sunset and I are 'study buddies'." Circe twists her head towards Sunset. "Isn't that right, Sun-"
Heh, how informal. I expect she's settled right into ponyhood, right down to using magic with ease.
Finishing her last check, Sunset makes momentary eye contact with Celestia and then prances over to nuzzle Circe."
"-set." Circe hesitates for a moment, then cranes her neck down and attempts to reciprocate the gesture. "Are you prepared?"
Huh, unexpected. I'm guessing Sunset's having a few last-minute worries. Or giving Celestia's nose a bit of a tweak. "Look how much
cooler my other teacher is!"
Sunset pulls back slightly. "As much as I can be. I've confirmed my hypothesis as much as I can without experimental data. The only thing I can do now is cast the spell."
"I meant: are you ready?"
Ready to become a demi-goddess? This is no small step, with no going back as far as we know. Of course she's nervous...
"I…" She sounds uncertain, her head dropping slightly and her eyes roaming around the room. Then she sees Celestia and her expression hardens. "I'm as ready as I'm going to get. Anything else is just cowardice."
"Good." Circe kisses the top of her head and then steps back. "But just in case anything goes wrong, I'll be here and so will Grayven."
Sort of taking the role of substitute parents, aren't they? I wonder how Sunset's actual family will react...
Surely they've been told...
I nod. "Pretty much anything short of you being plastered all over the walls, I'll be able to fix."
"Thanks, Grayven, that's exactly the mental image I needed."
Well, as long as she's still got an intact brain, the Rings can do a lot...
"Yes, me sticking you back together. So don't worry."
She shakes her head and walks back to her diagram.
"Just get out of the way."
And the nerves have been stamped down. Probably still fluttering below the surface, but she's bound and determined now.
I consider prodding her to say something to Celestia, but… No. Instead, I walk around the side of the diagram and and pull up next to Pinkie Pie.
"How's the family?"
"Bigger! The other me's weren't the only ponies in the Mirror Pool."
Interesting. I wonder how many people have messed with it over the years...
"Oh? Who else?"
"Granny Pie! Which I shoulda realised because she couldn't have known how it worked without using it at least once!" Makes sense, I suppose. Pinkie grins. "Granny Pie died five years ago! Mom was so happy to see her that she screamed and fainted!"
...God dammit, Pinkie... There's comedy and then there's
Comedy...
I regards her fondly for a moment. "Ah, Pinkie. Never change."
"Hey, how'd you know I wasn't one of the other me's?"
As if they'd let them in here? Bad enough Pinkie's wild talent is in the room.
"I guessed that the others are being held somewhere pending being rehoused, so the only other you you could be is Party Popper. And I know you're not her."
"Oh. How?"
Do tell, Grayven...
"I've.. sort of.. marked her. It will take a while to wear off."
Pinkie looks a little uncomfortable. "And you didn't let her have a shower afterwards? That's kind of… Icky, don't you think? I mean, I guess what two consenting adult do in private is their own business, but you've both been walking all over Canterlot and I'm not-."
<Spit-takes> Seriously,
that's the first thing you think of? Dammit, you've got a dirty mind, filly.
"Not… That… Not 'marked' like I-. Ew!"
"So how did you 'mark' her, exactly?" She shakes her head. "Because all the ideas I'm coming up with-."
I'm guessing he bonded with her as a vassal, much as he did with his other friends.
"If I could have everypony's attention!"
Sunset's standing in the middle of the arcane diagram, which is glowing in the same colour as her horn's aura. Celestia stops lurking in the doorway, but is still standing back from the rest of the audience.

It Begins!
"My name is Sunset Shimmer and today is the day I finally become an alicorn. As I'm sure you know, an alicorn is a type of pony who possesses the magic of all three tribes, which combine to make them even more powerful than any normal pony."
Twilight shakes her head. "I didn't get that much of a power boost."
Have you actually tried doing things other than flying?
Sunset gices her a mild glare. "Maybe if you used your non-unicorn magics a little, you'd have noticed it a little more."
Twilight opens her mouth, but Applejack looks at her with raised eyebrows and Rainbow Dash just nods. Twilight slumps slightly.
I'll bet AJ is just wondering "
What Earth Pony Magic?"
"So as I was saying, becoming an alicorn requires the magic of all three tribes. So far, that's happened using a powerful magic discharges from ponies of all three tribes perfectly aligning with the recipient's special talent or a spell which called upon the magic of all tribes through ponies with whom the recipient had a strong emotional bond. I will be using a third technique, a more controlled version of the method Cadenza lucked into. This network will draw on the platonic ideal forms of the magics of all three tribes via the magic networks covering Equestria… Harmony, if you like. I will use this to alter my own metaphysique into that of an alicorn. From the outside, all you should see is a quick flash of light. From inside… I don't know. I think Twilight's visit to an 'astral plane' was a byproduct of the inefficiency of the spell she used, but…"
Ah, but you miss out on the song from Princess Celestia! Or whatever mentor you favour most, I suspect.
She shakes her head.
"The whole thing should only take a few seconds, so here goes!"
Sunset's horn glows brilliantly, the strength of the glow mirrored by her diagram. I glance around the circle and both Circe and Celestia have their horns low level glowing. Not sure what Celestia's planning: there's no way she understands the process.
Hopefully just magesight spells, letting them see the workings. Or maybe Celestia's preparing a shield spell. Just in case.
"First stage is fine, now I unbind my magics to enable the change. That should happen fairly auto-."
The centre of the diagram flashes, though not brightly enough to interfere with my vision. Sunset isn't there.. any longer. Or rather, her outline is gone. I'm.. slightly concerned-.
No smouldering symbol of her cutie mark?
Then the light vanishes, the glow of the diagram drops off and
oh goodness me.
Sunset takes a breath, then looks around the room. Then she flares her new wings and looks down at herself, then left and right at herself.
Well... That was certainly successful. Let's hope it - and she- is
stable.
Then she looks at Celestia and grins.
"Yes! Tallest alicorn!"
That reaction! Entirely in character. Guessing she caught up to the fifteen years she was technically away from Equestria...