Reportedly he has practice! Everything the dead guy had on him should be checked for curses. In case it was a cursed item planted by one of his ostensible allies or something. What else is there to do now, anything? He'll take Can We Get Out Of Conscription With Illegal Orders Rules if that's all there is.

He could attempt to adjust security procedures to make it more difficult for invisible people and/or people who can teleport to get into the camp in the first place? He could randomly select some of the staff who might be embezzling and pay Rathimus to do an Abadar's Truthtelling? He could go deal with some people who are loudly annoyed about the Hellknights?

He could see if the handful of wizards attached to the army outside of their adventuring party would be willing to let her copy additional spells for the sake of her experiments!

Is Nenio having trouble convincing them to allow this in whatever manner is traditional for wizards?

"They requested that I direct other wizards to them rather than permit them to copy the spells from my spellbook directly, and expressed displeasure when I informed them that I would be unlikely to remember agreeing to such a condition. ...And also did not want to."

"I can see how that would be a problem. I don't think I can usefully intervene there, we don't have an internal free trade agreement for spells."

"That is most unfortunate, and will delay the progress of my magical experiments." 

"Well, if you do get ahold of a good spell without this condition maybe you will be able to trade it for more."

"Perhaps. Did you know that" she gives a visual description of an attached foreign wizard adventurer "is weak on illusion magic and specializes in abjurations? His priorities are highly confusing."

Nenio can be occupied with conversation along these lines for as long as Blai cares to be deliberately busy.

It's very convenient of her. "Abjurations are useful in practice in most situations and especially at the Worldwound even if you do not care for their mathematical aesthetics."

"In many cases, the function of abjuration spells can be adequately served by other magical effects. For example, many abjurations serve primarily to prevent injuries, but it is also possible to simply use healing magic after the fact, presuming of course that you survived, which functions by conjuration both in the case of a Cure Light Wounds and in the case of modern healing-wizardry spells, despite their different mechanisms of action."

"The presumption that one has survived is a pretty major one. If you could guarantee survival in some way then healing rather than defending might make sense, and some bias in that direction may yet stand up to the present balance of arcane versus good-aligned divine casters we have among us, but it's not a safe general heuristic."

"In some cases it is also possible to achieve a similar effect with spells that are cast in advance. For example, the spell Aid can provide some protection against injury; although it is typically a divine spell, a wizard of the third circle or higher can make use of the effect by summoning a lantern archon and requesting that they cast it. Likewise, the spell Lesser Angelic Aspect uses a transmutation effect to more efficiently achieve the objectives of three simultaneous abjurations, albeit at attenuated power and in two cases reduced duration..."

(She can continue listing examples for a while.)

Eventually he will go see what the people who are loudly annoyed about Hellknights think they're doing.

"Well, sir, I've read the Acts, and — I know people mostly think of Iomedae as the goddess of the war on the demons, but in the original Acts she actually opposes Hell just as strongly as the Abyss, maybe even more. And we can't very well ask Cheliax to leave the northern border, but I think it sends the wrong message bringing them on Crusade."

"They're slavers and torturers, isn't that enough?"

 "Slavery's not a crime. I'm sure some of the nobles traveling with the army own slaves."

"That's also bad."

This one's an attached adventurer rather than part of the army per se. "I grew up in Galt, sir, back before the revolution, and — Shelyn teaches us that no one is unworthy of redemption, but that's really the best I can say about them."

"...They're Hellknights. Just to be initiated at all they have to sacrifice a victim to each of their five gods."

"I just think they're assholes, you know? Is it against the rules to call people assholes now, is that the sort of thing they get worked up about in Lastwall? That'd just figure."

"I've read the Acts too. Do you have a strategic objective in mind best accomplished by making conspicuous complaints about our allies?"

"The fact that they are slavers and torturers will certainly come up when they must account for themselves to the Judge. What are you hoping to add to that procedure? Are you suggesting that they should desert, or disobey their orders?"

"I don't require you to say anything particularly generous about their character, I question the wisdom of bringing it up negatively instead of not at all."

"That is untrue."

"It is not against the rules to call people assholes, unless of course it should present enough of a problem that you are ordered to cut it out. The fact that it came to my attention is suggestive in that direction. Do you have anything to say for yourself?"

"...Not really, sir. But — I'm not a paladin, it's not a rule for me, but Iomedaeans aren't supposed to lie."

"Is that some kind of trick question? Obviously they should disobey their orders if their orders are 'bring back escaped slaves to be tortured' or 'torture this person.'"

 "Are you allowed to say that?"

"I haven't been talking to them."

"I think the Mendevian forces are thinking of them in a way that's not really accurate. And I understand where they're coming from, but they aren't really like normal Mendevians who are kind of intense about discipline — I guess not all of them are Chelish, but the ones that aren't still signed up to be Hellknights—"

"Obviously they aren't going to admit to it."

"I think whoever was complaining should mind their own damn business."

"I am not suggesting that you lie. If anyone asks you point blank about your opinion of Hellknights you are permitted to tell them until further notice."

"You are in case it was not clear not allowed to say that to them, being as it would be an action intended to interfere with our Worldwound allies' internal disciplinary matters."

"The rank and file Chelish soldiers are also our allies here. I have not actually encountered any Mendevians with a particularly rosy opinion of either."

"Do you simply assume whenever you concoct a story about a secret that it must be true, because if it were true the secrecy would explain why no one else has ever mentioned it?"

"Is disparaging chatter about our allies a form of minding your own business?"

"Maybe we've been talking to different Mendevians," says the third guy.

"I didn't come up with it, I heard it from my cousin."

"...yeah? As long as you keep it in the unit."

"Your cousin is mistaken."

"It did not successfully stay in the unit. Take this as a caution about how information travels, and perhaps you will not need another in the future."

"The Hellknights can lie, you know. Maybe they told you they don't do it because they knew you'd be mad."

"Your cousin can lie too."

"He wouldn't lie to me about anything really important."

"Cease to repeat sensational rumors about our allies without better corroboration than that. Am I understood?"

"....Yes. Sir."