"So anything from running down the power in the Divine Beasts to them deciding to sod off to the afterlife could do it?!"

"So you should tell Revali not to leave without notice, along everything else. In case you do get dismissed, can you tell us how to summon more people like you, in case we can replicate the necessary conditions some day in the future?"

"Yes, I can even tell you how to summon me specifically again."

"Come on, then, spill, spill!"

Cam makes a circle for himself. "This will summon me unbound. I don't know a binding design that would prevent me from acting if possessed or even if that's possible in principle, though I could take a stab at designing one in case it helps. Negotiating a task around a binding is slightly more advanced but I can make you circles for random angels and fairies in case you need those - it's plausible they're more applicable to the Ganon situation anyway - and give somebody a lesson?"

She looks at the circle. Is it written in a local language or obfuscated?

"Syyymmiiiinnnn!"

    He pokes his head in from where he was hiding behind a shelf. "Translations aren't done yet."

"Wanna learn demon summoning?"

    "...Sure."

The unbound one is written in a local language, assuming Revali is literate! Except he hasn't decided how to transliterate his name yet. "So what you want to do if you're using this one is you get it flat on the floor - a little tilt is okay but not a lot - and you fill in this gap, here, so it counts as you, not me, making the circle. That gets you me, with no constraints on my behavior at all, I'll be able to go do stuff immediately. A more complicated circle, which would take me a lot of work to confidently translate, will be intended to get you whoever among the relevant daeva species answers first, so it could be almost anybody, but the complexities are safety measures. Bindings. Make sense so far?"

Revali is indeed literate!

All of them are listening, even Link. Symin nods.

"Now, some things you might want a fairy for are not necessarily compatible with the bindings that are standard on Earth, because they are there mostly to prevent fairies from being dangerous to people and property, and you might conceivably want a fairy to be dangerous. But translating or re-writing the bindings would be time-consuming and it's not obvious that it's the best use of my time, so here's a standard generic fairy circle." One appears. It is much much more elaborate than the one for Cam. "This gets filled in the same way, but the fairy won't be automatically able to leave the circle or act outside of it, nor even inside of it in a few ways that could have knock-on effects. They will acquire more freedom when they have come to an agreement with their summoner about what their job is and what they will be paid for it. This phenomenon doesn't track whether the summoner meant to agree, just whether they said something that sounded like it - 'yes' or 'okay' or 'deal' or whatever. So for amateurs I would recommend having someone else do the talking, and the summoner - whoever filled in the circle - chiming in when the agreement is hammered out."

"What do fairies and angels do again exactly, executive summary..." says Symin as he reads the bindings.

"Both are indestructible same as me. Fairies are telekinetic; they can fly, haul stuff around, compress things or rip them apart. Angels change things - they can diminish them to nothing, or transmute them into other materials, or heal if they do some of their own detail work."

"Subject to the same matter limitations as you, or you don't know?" He looks up. "This is a lot of text, unless this language is an order less compact than Hylian."

"Demons have the longest range and the greatest rate of possible matter affected. Angels have the shortest range and lowest rate. We all have about the same information or contact with a target location in order to do magic there. And yes, the state of the art is very complicated circles that people don't try to hand-write, to cover more and more creative exploits."

"Are interactions normally so... adversarial? Is it the mortals that summon you, or can demons and angels and fairies summon each other? How do you relate to each other?"

"Interactions don't have to be adversarial at all! Only mortals can summon us. Most daeva were never mortal and aren't intimately familiar with how fragile mortals can be, the precautions help against that too. But when you're summoning randoms, you don't know who you'll get. Most daeva of any species are lovely people and the ones that aren't can do phenomenal damage."

Nod. "Sorry, you were just talking about negotiation."

"Right. The outcome of a negotiation is a task for the daeva and a payment for the task. You want the payment to be something you are either dead certain you can come up with unless you - the summoner, specifically - is dead, or you want to insist on paying in advance. If you fail to come up with the agreed upon payment in a reasonable time frame after the task is complete, the binding loosens till they get it, and you cannot dismiss them till then."

"Can I dismiss before a deal is struck? How do I dismiss?"

"You can dismiss before a deal is struck! You just concentrate on wanting the daeva gone for about one minute straight. It's less hard than that sounds, you don't have to achieve perfect meditative focus."

"Hm. So let someone else do the talking so you don't accidentally agree, pay in advance, dismiss by thinking for a minute. Is agreeing to a deal by reference generally safe—so once the negotiator and the daeva settle on a wording, if the summoner says 'I agree to the described deal', can the daeva draw the box around a different set of mentioned statements as 'the described deal'?"

"Yes, that works. You can also put the deal in writing."

"Deal in writing. Do you have a book of common mistakes or case studies, or any other reference text—if you leave us a dictionary and other materials it doesn't have to be translated; we can decode it the old-fashioned way if you end up missing—how do you know Hylian, anyway?"

"Daeva automatically get all the languages spoken and read and so on by their summoners at the same level of fluency. So anyone you summon won't have any trouble talking to you. If you fancy doing a decoding project, sure -" Big ol' dictionary, some summoning textbooks.

"Well, ideally we don't need it, but if we do, better have a decoding project than nothing at all."

Symin flips through texts to make sure there's enough of a corpus to make his life easy, then beams.

"Are we still missing anything?"

"There's honestly a lot of complexity in how you want to define tasks and payments. The good news is that you only need that if your daeva is trying to fuck with you, and this is a sufficiently weird and delicate situation that if you get a bad vibe you should just dismiss and retry. I can make you a lot of circles - I can even make you a printer that'll dispense more, where d'you want it?"