First, to Razmir: DON'T PANIC.

A troop of paladins, freshly relieved from their Worldwound posts by Razmir-summoned angels, is Teleported into Barstoi's capital and politely inform the Hellknights that they are interfering with an operation providing logistical support to Lastwall's forces at the Worldwound, and therefore are in violation of the following subsection of the Worldwound treaty.

(Razmir was not going to panic, Razmir was going to unleash a mob of bound fiends on the county with orders to kill everyone on his list of rebels. Panicking would be much less friendly and polite.)

Absolutely false; not only are no logistical operations to supply the Worldwound currently taking place in Barstoi, but if that clause was interpreted to mean that anything that distracted Razmir, the lawless usurping false god, was illegal, than the following six operations by Lastwall (which caused Cheliax to devote less resources to the Worldwound than they otherwise would have) would violate the treaty.

Sigh.

Do you swear upon your Law and your honor not to allow information revealed as part of these negotiations to come to the attention of Cheliax or Hell?

(Better to ask this now rather than only when they need it, which would tend to reveal at least the outline of what they're hiding.)

"No, I expect to die in the next week."

"We can arrange not that, if you'd prefer. Also, you don't actually detect as Evil."

"My duty is to my superior, Count Neska, whom I still serve in his absence; in this I act by my judgement of his judgement, which is that I should resist the tyranny of the False God rather than surrender the county of his creation to this enemy of true religion and morality."

"And whether or not I detect Evil, I am incapable of committing that on judgement I will not go to Hell, as more than fifty percent of Hellknights do, and therefore I cannot make this binding compact."

So they can't tell her that Neska is still alive, in their custody, has atoned to Lawful Neutral, and, while he disapproves of Razmir, absolutely does not want his Hellknights mounting a pointless resistance that will get all of them killed and, as Varga correctly pointed out, half of them sent to Hell.

(The spectre of Hell had already been looming over Neska, in his old age. Capture by Lastwall was more than enough shock to make him reconsider a few things about his life.)

"Very well. Our compact with Razmir, by which he has agreed to build us a supply route for our forces at the Worldwound, does not require us to assist in his conquest of Ustalav, only to refrain from interfering in it. If you believe, honestly, that you can maintain Lawful government in this place, and do not interfere with the road-building or our supply caravans, then our only interest in what you do to Razmir's priests is that you please turn the next one into a statue instead of sending him to Hell.

"Also, if you maintain this course, you are almost certainly all going to die, and I would mourn to hear of half your number being damned to Hell."

"We intend to maintain Lawful government and secure the county against all trespassers," she confirms, "as well as working in concert with other military forces opposed to Razmiri tyranny. We do not acknowledge your interpretation of the Worldwound treaty as correct and will appeal for arbitration should you attempt to press it, but we now acknowledge your interpretation."

"And the sentence for his crimes by the legal code I enforce was and is death. If you know of specific reasons I am incorrect in my decisionmaking, you are Lawful, as an I," by a Detect Law spell and them being paladins, "and I can respect your sworn oath, but my duty is Law, whatever the price."

"We will accept the arbitration of any Lawful Good or Neutral church active in Avistan. Which of them would you prefer?"

(They don't expect to win that battle; the point is just to make it look to Razmir like they have a solution in hand, for long enough that they can persuade him into some course of action that isn't 'kill everyone'.)

"We will accept arbitration on the Worldwound Treaty from the church of Abadar," because he cares more about the treaty than about the worldly consequences thereof.

Then, if she would, she should accompany them to the Temple of Abadar in Absalom. Sooner would be better, as Razmir is not known for his patience and they'd like this to resolve peacefully. They're happy to provide a Teleport.

(A Sending goes to Razmir asking him to meet them there or send a representative, if he would like to be part of these proceedings.)

Razmir is not part of these proceedings. The arbitration regarding the road is irrelevant; these are rebels against His rule and deniers of His divinity, and they will be crushed.

She'll send her deputy; he has a summary of the information; as the highest-ranking Hellknight, it is her duty to not abandon her knights in the face of danger.

Then they'll go.

Ernesto Zampetti, Lastwall's semi-official liaison to Razmir, will also arrive at the temple, with an amount of money that should be sufficient to preempt anything else on Temos Sevandivasen's schedule.

He explains Lastwall's position. (The official one, not the one where this was largely their idea.) Razmir is the Lawful governor of Ustalav: see surrender agreements blah, blah, and blah. They have the following compact with Razmir to build them a road. This road constitutes logistical support for Lastwall's Worldwound positions, see definitions in the Worldwound treaty. By rebelling against the Lawful government of Ustalav, the Hellknights of Barstoi are interfering in the construction of said road, which is a violation of such-and-such subsection of the Worldwound treaty. They don't ask that the Hellknights acknowledge Razmir's authority, just that they...go away.

Paralictor Eilisilo Varga, the Hellknight explains, was deputized to Count Aericnein Neska by her superiors in the order, here are copies of all the paperwork; her duties officially included counterespionage and oversight of the justice system. Razmir used magic to enslave every count in Ustalav, at which point they surrendered their powers to him and his deputies; per the following codes compulsion spells are legally considered violence, not free gift, hence this transfer is legally invalid. Count Neska was teleported to an unknown location by Razmir's representatives, they haven't seen him since; here are their corroborative witnesses; as highest-ranking deputy of Neska believed free of mind control, Paralictor Varga has formed a government to act in Count Neska's stead until he is released or a successor can be found. The Worldwound treaty obviously does not include the right to conquer any country you want if it simplifies your logistics, this is ridiculous, behold the relevant subsections.

Yeah, it sure does seem like that's the case.

"Where is Count Neska?" asks Temos, mostly in Lastwall's direction. There may be no one in Barstoi capable of casting Scrying, but he can, and it certainly seems like finding the Count is the fastest way to get this cleared up beyond a doubt.

Um.

"I can neither confirm nor deny any knowledge of the whereabouts of Count Neska," he says, "unless all present swear not to allow the information to come to the possession of Cheliax or Hell."

"As I may die shortly, I am incapable of swearing this oath," this Hellknight concurs.

"You may leave the room, then, and I will hear the truth, and report what of it is safe to reveal without risking the wrath of Hell, if that is indeed a consideration here."

He will do that!

"Neska is in Lastwall's custody. He is alive and unhurt and has Atoned to Lawful Neutral. He was, indeed, compelled to surrender, but does not wish his knights to mount a doomed rebellion which will damn many of them to Hell."

"Why did Razmir send him to you?"