Nope, he has nothing.

"Allow us to verify that you are as you appear, but then of course."

Now does anyone actually have the means to do that? Anything that can gate can mind blank but if it's really Morgethai she didn't come prepared for a fight -

"Who - besides the archmage - is best at identifying spellwork?"

"Gallipsiwhoop, of course, but I'm sure you won't trust his word for it either - may he cast an antimagic field for you?"

...That would verify that the creature claiming to be Gallipsiwhoop is in fact a faerie dragon, and can cast an antimagic field -

"If anyone knows a way to nonmagically take the form of a faerie dragon, or of any other faerie dragons that can cast an antimagic field, speak now - "

No?

"It'll have to do."

Then a brightly colored tiny dragon with butterfly wings will come and land in the middle of the dinner table and cast an Antimagic Field, in which he is definitely still Gallipsiwhoop, if you can tell faerie dragons apart, and definitely still a faerie dragon even if you can't.

Detect Evil.

Detect Magic.

Gallipsiwhoop before casting the antimagic field is not Evil. Gallipsiwhoop after is still not Evil and also no longer has magically observable attributes.

There are probably sensible tests Marit could be trying to think of but instead of doing any of them he suddenly, bizarrely, feels like he's panicking about the archmage! 

"Not that I can detect magic, but it looks to me like the field is affecting the paladins among us. So either the Provost is genuine or a sixth-circle wizard got an extremely specific result on a reincarnate. I don't think we'll get a better proof unless she consents to let Ser Tauler smite her with a merciful butterknife like I hear he did during the riots."

Oh, also Jilia is wearing chainmail now.

Carlota does not primarily design her outfits with sleeves of many garments because that makes you look like a poor person - they're real silk - but she uses the sleeves for matching jewelry since she can't justify buying ten sets of it. She is abruptly without jewelry. She doesn't otherwise look any different.

"I think those stories are a little exaggerated," Feliu says.

Joan-Pau is wearing clothes that make him look like a poor (well, middle-class) person! It's very important to do that if you're a Molthuni radical.

So's Xavier. Molthune has very broad definitions of radical.

The woman and her stuffed armchair are abruptly at the head of the table. She smiles at Feliu. "Ser Tauler may smite me if he pleases. I would prefer the knife be either merciful or butter but insisting on both seems a bit unreasonable, when I am the one whose wanders in the Astral brought me to such a specific place at such a specific time. - it smells delicious here. Kanyakumari?"

"Yes. That's an impressive talent, naming a restaurant on another plane off just the smell of the food."

Feliu will glance at Joan-Pau, shrug, "If you have no objections -" and pick up a butterknife off the table which kindles into holy fire and smite Felandriel quite hard.

Korva has looked like a desperately poor person all evening and continues to do so.

She should really have processed more of what was going on about thirty seconds ago, but actually it has taken her about this long to fully realize that FELANDRIEL FUCKING MORGETHAI IS INVADING THE MANSION.

.....there are no possible actions that she can take about these events other than focusing on not shitting herself, so she's going to do that.

She has a Stoneskin up and not only does the smite not work the holy fire doesn't do anything either. He leaves a light scratch. She gives Tauler an only slightly condescending smile. 

"Oh, I cheated," she says lightly. "I was reading your old food blog. I have been nostalgic, see, for conversation about the civil war, and wondered if the mortals were having any of those just somewhere else."

Angela has only been immune to fear for a few months now and going back to experiencing it is unpleasant but not too terribly so. What is a food blog.

"Not on my food blog, to be sure. I never ended up reading any mortal histories of the war, and would hesitate to form much of an opinion about - anything but my own part in it - without that. But my part I'll speak to, if that's what inspired you to wander through the Astral -"

"It isn't."

"- or even if it isn't."

"I don't think we met, back then."

Elorri has been immune to fear for a little longer than that and his heart is pounding like he's been at a full gallop shooting things for the last hour but he has been at a dinner party instead. Why this.