"I need weights for the spellsilver and for the diamonds."

"One ounce of spellsilver. A Raise-Dead grade diamond weighs - I have never thought about this, sorry - seven thousandths of an ounce? And is this big across." She gestures at about the size of diamond one might find on a wedding ring. "I propose a deal in which you use your supernatural abilities only to attempt to make two ounces of spellsilver and four pure diamonds that reflect your best understanding of my instructions on their size and shape, and in exchange, regardless of your results, I give you my headband, which I have strong reason to think magically enhances intelligence."

"I'm okay with that deal."

She's not certified yet and also panicking and it's possible that she just said something very stupid actually, but also the default outcome at this point is that she's under a ton of suspicion - 

- "Deal. Then."

Diamonds. - Spellsilver. "Uh, that didn't allow me to make the vial with the oil, so you might need to get a spare of that."

"I know how spellsilver oxidizes, I'll be able to tell if you really did it. And I'll only lose about five percent of it." She's staring at it, wide-eyed. 

"- I"m not Good and I'm not about to be but if you wanted to help me out you could - not tell them how to summon more apsels, or summon you back -"

"Noted."

If it's a test that would be - failing quite spectacularly - but while she's a bit too panicked to reproduce her reasoning she remembers having concluded that if it's real, it wasn't a test.

She hands him her headband and immediately feels stupider and watches the spellsilver oxidize.

The priest comes back. Carissa kneels.

The priest reaches for the holy symbol at his neck and says something incomprehensible. Carissa shivers.

"A Chaotic Good outsider showing up in this summoning circle," he says thoughtfully. "Did you do it deliberately?"

"I voluntarily answered the summon."

"Are you usually able to answer summons targeting demons?"

"I am usually able to answer summons targeting apsels, my variety of demon."

He looks at Carissa. "Did you deliberately try to get an apsel?"

"No. I didn't know apsels existed. I assumed when it arrived that they were some rare undocumented kind of demon I'd gotten by lucky chance."

Back to Cam. "What god or lord do apsels answer to?"

"We're too chaotic for that sort of thing."

"What do you want?"

"The opportunity to run around and see the world, do magic for personal use and for others as the whim strikes me, magic items." He puts the headband on. "- ooh, I like this one."

"You gave it your headband?"

"The apsel's claims seemed of momentous import to the Crown and the Church if true, but plausibly some sort of horrible Chaotic game, or a ploy by our adversaries, so I negotiated a trade of a personal item for spellsilver and diamonds so as to know whether it was worth your time. The result strikes me as evidence that it isn't a ploy; had our adversaries such abilities, we would be charged with preparing to defend Cheliax or defeat them preemptively, and we are not so charged."

"It might turn back."

"Detects as nonmagical. And it's oxidizing. I won't know for sure until I try to use it, but - the Chaotic planes are infinite, it follows almost necessarily that there are infinite multitudes among them which could be useful to Asmodeus in some way..."

"Hand it off to me, we'll look into it further."

"Can you instruct me in how to do that, I have never handed off negotiating power with a bound outsider before."

"Ask him to accept me as negotiating in your stead under the same conditions as established in the circle and verbally previously."