That's an awful lot of diamonds. Even having prepared for there to be a lot of diamonds only goes so far to make them less shocking. Sevandivasen will dutifully measure and weigh them as a matter of principle, but with the transaction taking place in Abadar's realm he doesn't actually have any doubts he's assuaging.

And the Kolaryut will present the text of the proposed contract for their perusal! It's written in Utopian, which as long as you can read it fluently goes a long way towards removing ambiguity. The Inevitable also specifically draws Brenda's attention to the section for where and how to handle contract disputes; the archbankers have suggested the ordinary set of Axis and Heaven-based arbitrator organizations for high secrecy high value negotiations, but just because a list is standard is no reason that she shouldn't make sure she knows what she's agreeing to before she does it.

Utopian is a beautiful language and Brenda's self-control is running low; she'll read and understand and sign the contract but she'll also ask a bunch of questions about whether it's a natural language or a conlang and whether any efforts are being made to prevent it from evolving and by the way would the Kolyarut like to sell her permission to copy their heritable traits?

Utopian is a constructed language, designed by the Axiomites and some of the first Inevitables to fit their needs and maintained by consensus based updates; occasionally for changes where it isn't clear if a change is for the better part of Axis will switch to it and then they decide which one to merge based on the results. Since most of its speakers never die and they have a lot more ability to stay in communication than most mortals do, it's inherently more resistant to drift, but part of it is also done due to Inevitables being the way they are as a class of entities. There are also a number of other languages in use in Axis that do change more but most people who speak one of them also learn to speak and read Utopian.

What would that entail? There's a standard contract for payment to the varying designers of Kolaryuts and their improvements according to their contributions to the intellectual property that gets used when someone wants to make a new one, and another similar set for when you want to borrow features for a new kind of Inevitable, but if what she wants isn't analogous to one of those it will need to search less frequently used contracts.

Language version control! So cool.

It's a lot like borrowing features for a new kind of inevitable! Brenda would start having some of the features of the Kolyarut (which ones isn't possible to be certain of in advance); there would be no direct effects on anyone else.

In that case she should sign a contract agreeing to the following compensation to the following entities detailing the compensation for each bit, and then pay out the associated amount depending on what she ends up getting.

Designing new ineveitables that include some of the fancier features like constant Discern Lies and Geas are pretty expensive by the standards of mortals, though nothing that Brenda can't afford, but others like the regeneration and spell resistance and darkvision are apparently independently reinvented often enough that the price to use them has been bid down a lot.

It's cool that independently reinventing things counts rather than privileging whoever got there first.

Would this have been more complicated with a species that hadn't been designed, or less? Regardless, she's fine with it. 

Looks like she got . . . faster reflexes and a spell-like ability! It's an enchantment, looks like it's for paralyzing people? She's getting better at figuring out what spell structures that show up in her brain do without poking them.

Hmm, interesting. Those aren't the most unique to Kolaryut characteristics or the cheapest or the most commonly reused, which implies that whatever is guiding the copying has different standards or doesn't track any of those. They're both midrange features by price, though.

She thinks it's at least partially guided by what's the most different from the abilities she already has. Anyway, she can pay for what she got and then she's ready to go. 

Does Rathimus have time to stick around a bit longer while she finds a scroll shop and buys a bunch of scrolls, or do they need to head back now?

He cleared his schedule in case negotiations ended up taking longer. 

"Usually it's advised to do shopping on the material when you can, since on the outer planes you need to pay for both for the items and the intervention and magic items can get expensive even by the standards of someone as rich as you are. Buying in Axis is a lot more convenient in some ways though, especially if you want things that are rare on Golarion, so it's a question of how much money you're willing to trade for that and less attention."

"Oh, I hadn't realized there were intervention costs if it was just me buying from a local with no gods more than peripherally involved. Sorry. Is it because you brought me here and I should get a scroll of Plane Shift on the Material and come back on my own? If I use two Gates to get the army from point A to point B via an uninhabited bit of Elysium, does that cost Elysium?"

“Most of the limitations on how the outer planes can interfere bind the gods, since they’re the ones most able to, but the outsiders are also subject to them. It is why Axis cannot just teach us all of the knowledge required to build Aktun on Golarion, and the gods of Nirvana cannot just look the other way while swarms of angels head to the material to rescue everyone from harm. There is nothing wrong with buying goods here, they are just often more expensive due to having to also pay for the intervention.

“As for other cases… I believe that would not charge Elysium, and certainly not more than a minuscule amount, but I am not an expert on the matter. It is certainly cheaper for them than if you needed an Azata to make you the gates.”

"I'll be sure to ask Ramien before I commit to doing it."

While scroll-shopping will be cheaper on the Material, and just as convenient if she starts with a scroll of Teleport, Dragon Fairy Elf Witch-shopping is decidedly not the same everywhere. She'd like to stop at a few stores run by interesting-looking folks who don't look excessively busy and attempt to purchase their heritages before going home, if that's alright.

Certainly. They can take another trolley away from the first vault towards one of the market plazas that caters to selling Golarion export-legal magical goods.

When they arrive it's to a square with dozens of stores, mainly run by Axiomites and Mercanes. Each one has signage cheerfully listing their specialization (and thereby expected selling point compared to their peers) at the front, varying from 'Keeps rare protective items in stock for immediate purchase in exchange for correspondingly higher prices' to 'proprietor does custom armor enchantments, current queue 1.5 weeks' to 'this store rated at 93rd percentile satisfaction for matching items to purchaser's use case at only 76th percentile prices.'

Is there a specific decision criteria she has for where to start?

Mostly whoever looks cool! And like they won't mind a weird trade offer. The "matching items to use cases" place is probably used to conversations of varying lengths and the axiomite behind the counter is elegant and graceful; she'll start there.

"Greetings! What can I help you with today?"

"Hello! I have a somewhat unusual request for a trade: I have an ability that lets me copy some of the traits of anyone I meet with no effect on the other person, and I'd like to purchase permission to use it on you. I can't predict in advance exactly which of your abilities I'll turn up with; we can do a flat fee or if you'd prefer we can agree on multiple possible amounts depending on the result. I can also try to avoid any specific thing you'd prefer not to share, but I don't have conscious control of the process so can't commit to that."

Hmm. Well, that's not in their primary business model and likely to be less profitable than their usual trades that they specialize in, but since it's not currently trading off against their sales and is thus plausibly worth it in expectation.

"What counts as a trait, and what does copying imply here? Is it personal skills like knowledge of magical items, crafting practice, and so forth? Is it analogous to having a simulation of me and then being able to query it on questions?"

"No, it only includes the traits inherent to you being an axiomite, as opposed to an inevitable or an elf or something. The abilities you had when you started existing, roughly speaking. There are definitely no simulations of you involved." 

"Then if you require an agreement of sale first, I'm not sure I can offer it. The ability to become an Axiomite is something inherent to residing in Axis; I did not myself purchase any rights, that I could resell to someone else or otherwise, and therefore cannot offer you them in a contract."

That's a bit of a headscratcher. "I wouldn't be becoming an axiomite exactly? Just copying some of the abilities you have that other people don't. I'm not sure if you're saying that you don't care whether I copy you or not but don't want to have a formal agreement about it, or think it would be improper for me to do it at all. Does it help to think of it as selling me the information you have about what being an axiomite is like, except I'd be doing magic things with it instead of just learning it?"

"I don't have a problem with you becoming an Axiomite and wouldn't consider myself to relevantly have the authority to approve or disapprove of you doing so anyway. If you entered into a deal to compensate me for becoming an Axiomite that would be a deal entered under false pretenses where you paid me for something I didn't own and wasn't providing. I would be willing to tell you things about being an Axiomite."

"Okay, that makes sense." Heritage: get! And she'd love to learn about axiomites, what they do for fun and what kind of communities they live in and what they think the coolest jobs are. (And since she's taking up this guy's time she'll also at least look at the actual merchandise and see if there's anything really useful that she couldn't get on Golarion.)

It sounds like Brenda might like an Astralabe, a device used to help people navigate other planes! It's not exactly needed in Axis, but particularly for the chaotic planes it can be very helpful. For her work as knight commander, she guesses that Brenda could make use of a Lord's Banner of Swiftness to increase the speed at which her soldiers travel overland, and while Brenda's experimentation seems harder to pick out a specific item she guesses at p≥60% that Brenda will get enough use out of Triple Eyes of Vivid Auras to be glad of the exchange. Brenda may also want to look into a Ring of Delayed Doom, Amulet of the Planes, or Boots of Teleportation, but she doesn't currently carry them and would have to refer Brenda to another vendor or put in an order from one of her suppliers.