Yep, Irabeth should have specs for him.

The three of them are not disturbed on their walk; Nenio 'helpfully' provides him with updates on her survey of theological education in Kenabres.

Once he's past the guards, it's not too difficult to find Irabeth.

"Good to see you, Select. Anything new to report before we get started here?"

"I've handed off Radiance."

"Good to know." She retrieves a sheet of paper with cramped writing on it and slides it across her desk. "If you're available now, we should have everything set up for your Mark of Justice."

The spell has a ten-minute casting time, and it's one of the rare spells where that's actively a positive feature; most of the incantation effectively consists of blank space for specifying the act the target is prohibited from doing. In this case, their target is prohibited from (several slight rephrasings of) serving or working with demon lords, Evil gods, demons, or cultists of demon lords or other Abyssal powers, as well as committing any of the following major crimes, taking any steps to secure the removal of the Mark of Justice, and so on. It's phrased in a way designed to catch any violations well before the point where she'd actually be in the company of a cultist who could notice the problem and remove the mark. Irabeth wants Blai casting the version of the spell that makes it very difficult for the target to do anything, on the grounds that this is both impairing and very obvious.

Blai reads it over in case there is anything the matter with it that he can catch untrained and inexperienced in this spell, but they probably know what they're doing.

There aren't any obvious errors per se. The two things that might stick out a bit are the fact that the section on cultists is a bit more narrowly phrased than most of what surrounds it, presumably because a general prohibition on aiding cultists of Evil gods could obligate her to violate the Worldwound treaty if she encountered Chelish forces, and the fact that it prohibits an itemized list of specific crimes but doesn't prohibit breaking Mendevian law in full generality.

He is in fact capable of thinking of the problems that would arise if either of those sections were changed! He will nod when he's read it through, and go where the prisoner is.

She's chained up in one of the cells in the basement, where she's kneeling with her eyes closed in silent contemplation. Irabeth adjusts her restraints to allow Blai to perform the part of the spell that involves tracing things onto her body (in this case her hand and forearm).

"Hello, I'm Select Artigas."

She opens her eyes and nods. "Kattera."

"Have you read or had read to you what the conditions will be?"

She nods.

Okay, doesn't seem like she has questions about it or anything. He holds the paper up where he can see it to read from, and begins casting.

She remains still and silent and cooperative throughout the whole ten-minute casting time. 

Oh good that's very helpful of her. He steps back when he's through.

"Thank you," she says softly. 

"I can take things from here, Select."

"You're welcome," he tells Kattera, and "of course, Ser," to Irabeth, and out he goes.

"Many books written on the study of mortal societies analogize that spell to spells such as Geas! This suggests that their authors are not well-versed in the arcane arts, as the spell is strictly speaking a form of necromancy, rather than an enchantment." 

"Is it? How strange. Like Nap Stack."

She nods. "The leading hypothesis I am familiar with is that it relies on necromantic energies to inflict its penalty. However, this theory does not account for why Nap Stack is classified as necromancy. Perhaps someday it will be possible to design a more efficient version at a lower circle by taking advantage of the natural synergies with conjuration and enchantment."

"Would this make Rings of Sustenance cheaper, do you suppose?"

"I do not believe I have ever contemplated that question before!" She thinks for a few moments. "I suspect it would have a relatively small impact, as forging rings is a highly specialized skill, such that a significant part of the cost is the necessity of a crafter who has trained in it. If you wish to lower the price, you would have better luck developing an easier method of crafting them."

"There's a guy in Daggermark who claims he can do it as a necklace. ...Of course, I heard about him from someone warning me he was a scammer, so who knows if it's really possible."