The thing laughs, or at least, that's probably meant to be laughter.  It sounds horrible.

"Ah.  One of those services to Asmodeus."

"You would be wise not to insult us by offering us loot from the corpses of those we ourselves slew.  You would be wise not to insult us by offering us mundane riches less than you took from these corpses that we slew."

"Be there something about your person that'd you find more painful than that to sacrifice to us, that may serve to assuage our pride.  Some greater devil will be along in time, to arbitrate if more debt than that exists between you and Hell.  In due time, when your complicated service is done."

She draws the first ever Glibness sword-pin from her pocket with a sense of utter misery that doesn't, really, make a whole lot of sense - she can just make another - 

"This is a magic item of my own design, made by my own hands, and used on my project, Project Lawful, in Asmodeus's service. I have made others in its image, since then, but this is the first. May it settle matters between us, until it is clear what Asmodeus thinks of my service to Him."

Bony fingers take the needle from her.  "It is a little thing, but I see that it pains you much to part from it.  You can seek to buy it back, do you return here before a century passes.  Expect its price to be dear."

"Do you truly seek passage to Dis in this place?"

"I don't. I think I see the purpose I've been steered for, and it is in Golarion. And if I'm wrong, then I'll come to Dis soon enough."

"You shall come to Dis soon enough either way."

Well, that's not the least ominous thing that a bony many-fingered devil ever said to her while meticulously wiping its claws clean of the blood of people that trusted her. 

....actually it is, but not because it's not ominous, just because that specific thing hasn't happened before. 

There's some pretty valuable things Hadrian has on him, but the most important one right now is definitely this remaining scroll of Plane Shift in his Bag of Holding.

Yep. 

(She could have used her Gates while not in Avernus, and a Wish to get to Keltham, but firstly it seemed like a really bad plan to ask a pit fiend to their face for a Wish that seemed obviously traitorous, even one with a known safe wording, and secondly she might need those Wishes to save Asmodeus and the world.)

Scroll of Plane Shift, presumably he's got a tuning fork for the Material no one planar travels without those ah here it is -

- how about scrolls of Teleport or Sending, any of those -

Both.

Right. 

Fly.

Greater Invisibility. 

Plane Shift. 

It drops her over the ocean, which is fine because she's only here for six seconds while she reads -

Teleport. 

In the grand temple of Abadar in Absalom an alarm notifies staff of the appearance of an invisible teleporting person. That happens a lot, in any temple that services adventurers, and they're not anywhere near where the vaults are; no one is particularly concerned. 

Shortly after that, another alarm interrupts Temos Sevandivasen in his office; this is more surprising. 

"Hi," says a woman as her invisibility wears off. She's wearing a nightgown; her hands are bloody; she's the most stunningly beautiful person most people have ever seen. "I'm Carissa Sevar. Can you get me into the Black Dome in the next twelve seconds I am not committing to defecting or taking Osirion's money."

"No."

"I'm afraid so."

It took time to be sure.  There was no report from the Security team that took Sevar to Hell; Sevar did not reply to a Sending; a Scry failed to find Sevar -

- and another Scry found Hadrian's soul with his owner in Hell.

There were Messages exchanged then, through the Scrying.  When Hadrian reported that Sevar had claimed the Most High had done all the talking last time, Aspexia knew, then, though mostly she had known already.

Discern Location did find Sevar in Osirion, in the Black Dome, though even Discern Location could narrow it no further through Ulunat's living shell.

Aspexia did scry also those devils she and Sevar had met at that fortress, and inquired of them too; lesser beings of Hell's surface layer, permitted to report knowledge of their interactions with adventurers, and not have that be an intervention of Hell.  So Aspexia learned that Sevar had instructed them to kill, looted the bodies of her comrades, taken those bodies with herself, returned to the Material -

Carissa Sevar had claimed to be serving Asmodeus in a complicated way.

Sevar might, perhaps, have simply been lying.

If Sevar's words had been true or at least honest, there might be some tiny hope of Sevar still being aligned to Cheliax, returning to them reconciled, in time.

Aspexia Rugatonn, after careful consideration, is telling Pilar simply that Sevar defected.

The Queen, Aspexia now judges, has shown herself incapable of manipulating tropes - that one night's tryst, in retrospect, was simply appealing to the tropes to curse them after - and so Aspexia is now trying her own hand at it, for lack of literally anyone else.  Does Pilar hold out hope in Sevar, the tropes will crush it; they seem to be in that sort of story.  Does Pilar, now the last surviving trope-girl of Cheliax, believe herself by all signs betrayed, the story may subvert her expectation.

To Pilar, then, it should be told simply that Sevar betrayed and murdered her comrades within Hell, including Olegario, and fled to Osirion.

"Am I - to be next, then?"

A jolt of unease runs through Aspexia Rugatonn.  "I cannot read your mind anymore, Pilar, and I do not understand."

"Everything about Project Lawful is being wiped away, like Prestidigitating a wall clear of what you've drawn there.  Keltham.  Subirachs, Maillol.  All of the trope-girls one after another, Ione, Asmodia, now even Carissa Sevar -"

"Cease this foolishness.  You are not the last remaining trope-girl loyal to Asmodeus, you were the only one truly loyal to Him to begin with."

"Yes, Most High."

"I - not of my will, my brain, has thoughts, that disobey your command to cease my foolishness.  You cannot hear them, now, am I to speak them?"

Aspexia sighs heavily.  "Speaking things can give them more power than only harboring them as thoughts.  It's why I use Detect Thoughts as much as I do among loyal Asmodeans, to hear what people wisely do not let their lips say but which I should know they are thinking."

"If you can pretend that you didn't choose to say those thoughts, somehow say them without hearing them as your words, then do that.  But if you believe I should know what - your brain, as you say, is doing without your will - then tell me of it, regardless."

"I'm afraid that Snack Service is going to tell me that I have to - defect, make myself vanish, like Asmodia and Carissa Sevar did, because it serves Asmodeus in a complicated way that I'm going to believe it about.  Everyone on the Project is just going to wake up one day and find out that the last of the trope-girls is gone."

By the tropes, it's less likely to happen exactly that way now that Pilar has said it out loud.

"If you say it that way, Pilar, it sounds like you're thinking about how your friends will be sad if you're gone."

"Yes, I was.  I regret my incorrectness."