And the next morning she can check that Élie is at the Diobel tower and - bring him with, actually, he'll be easier for Abadar to locate if she can just point - and go to Abadar's temple in Absalom. The miracle she would like to request is that Abadar Look at the two of them, and confirm for her that:

(1) This man has treated with her fairly,
(2) That he has not deceived her,
(3) That he is not - and this part is important - the archdevil Mephistopheles, nor the archdevil Geryon, nor any other archdevil, nor demon lord, nor in fact anything at all besides an unusually impressive human from unusually far away.
(4) To the extent possible for Him, that Élie is not mistaken about where he is from.
(5) To the extent possible for Him, that Élie is not mistaken about The Important Parts of what he told her. She's not going to tell Tilbun what The Important Parts are, but Abadar should be able to see it. It's not that she doesn't trust Tilbun's word not to act on that information, it's just that it's Very Very Secret and she trusts Tilbun's ability not to act on that information less than she does his god's.

And then, she supposes, if (1-3) are true, to confirm for Élie a reciprocal set of facts, since that seems more fair and Abadaran.

And do absolutely nothing else with any information He gets from this interaction.

And then Abadar barges into her mind without much delicacy, and Looks through the whole of her and leaves behind four declarations of TRUTH and one declaration of MOSTLY TRUTH - because Élie is a little more than a mortal human, the same way Alfirin is a little more than mortal, or Iomedae is a little more than mortal - and a headache that, for all she's heard about this before, is worse than expected.

Under the pain, though, she's happy because - it isn't all a lie, prophecy can be broken and Asmodeus can be toppled, and if the Age of Glory isn't what she expected she's not sure that it's worse.

She takes Élie's hand and plane shifts, not to her best hidden demiplane but to her gardens which can be dark so that they can rest for a few hours - half a day - before planning anything complicated. She meant to ask Tilbun how many teleportation circles they would need to sell to get a replacement wish diamond but rather forgot.

And then late that evening, they're feeling well enough - and impatient enough - to go somewhere very bright, where prophecy and foresight do not work very well at all, and talk.

"So. Prophecy breaks when Aroden dies - and that's probably not a coincidence but not necessarily causal and even if it is that could go either way - and then as soon as Asmodeus doesn't have a country on the Material, he loses Hell. It seems like - the big thing we need to get right is Prophecy breaking, but we also need deal with some smaller matters like Tar-Baphon and making sure Asmodeus can't get the foothold he needs before we actually break prophecy."

"Tar-Baphon, I'm not too worried about. By default, the shining crusade triumphs in 3827. I'll want to start figuring out how to break prophecy in parallel, since right after the crusade might actually be the best time to do it – there's not another point in the history of Golarion with as many powerful adventurers broadly aligned with the interests of mortal beings all in the same place. I'm not sure if Iomedae should ascend first. On the one hand, since she succeeds by default, we might not want to change the starting conditions too much. On the other hand, infant gods have to spend time consolidating their power, and she might actually be more useful against Asmodeus as a mortal paladin. 

Also, my companions and I did win this war the first time we fought it, and that was after Asmodeus had a century to dig in. I expect that my wife and – you, actually – are trying to find out where I went, and I'm reasonably confident they'll succeed, but I can start working on it from this end as well if it looks like they're stuck.

I'm most concerned about what else might happen. There were a lot of catastrophes in 4606. Ideally we'd be prepared to evacuate whole countries at very short notice. Realistically, tens of thousands of people are going to die.  – It was millions, the first time, but I think if we know what's coming we can prevent the worst of the chaos and starvation of the years after." He's not going to insult them both by pointing out that there are trillions of souls in Hell.

"...and the next time you ask a god to call, warn me first." 

Of course she'd be looking for him. He described them as friends, and if Iomedae vanished to a different world she's sure she'd be trying to figure out how to get her back as soon as the crusade was stable. And it sounds like they were at peace, when Élie vanished from his time.

"I did warn you! I told you I was going to ask Abadar to look at you very closely! Possibly I should have warned you about the headache, but I thought you'd already know."

"...Probably the most important thing to do, now, is to figure out what the best use of Iomedae is, since how much we can tell her influences our contributions to the crusade as well as our ultimate plans. I think the main reason we might not want to tell her and ask her to delay her ascension is if we think we can win on the material without her and - having her as a god is more useful in the long run and we don't know if her ascension would be successful after prophecy broke. Related to that, are there any more ascended gods besides her?"

"No. ...Not yet. 

I think we can win without her." 

There was something in that 'yet' - Élie? His wife? Future Alfirin? A yet-unmentioned companion? She's not sure which and it doesn't seem important for their situation.

"So - we let her ascend, as normal, and we don't tell her what we're planning. I think she would accept that but her advisors would be very unhappy about it and it would make our alliance with the crusade more strained. Especially if we want to use their resources for our project - or the cleanup after. I'd rather we figure out something we can tell them that's - first of all true, I can't reliably get a lie past her and if you can't reliably get one past me then you can't either. True, and convincing enough to win their help, and sufficiently uninformative that neither Iomedae nor anyone who might have doubts about murdering their god will guess that that might be involved."

"I'm from the future. About a hundred years before I was born, Cheliax fell to the rule of Hell. I fixed it. I'm not saying anything more about the circumstances in which it occurred, including the exact century, because now that I'm here I'd like to prevent it from happening in the first place and while I'm doing that I don't want to give Asmodeus or his servants any clever ideas." 

"...That'll do it. Be quite alarming, justify a lot of secrecy. True, and they'll notice that we're not giving the whole story but that's explained. Simple enough that it shouldn't slip,even if we keep it up for months."

"...I want to do a teleportation circle. I mean - I want to do one for Archbanker Vakkad, in exchange for a wish diamond, because I owe one to the crusade. But also I've never cast one before that actually works - I tried what I'm sure are all the usual things with bilocation et cetera - "

"Oh, it's terrific fun. Requires too much complicated dynamic spellwork on both ends for bilocation to work, but if you're willing to put the time in you can build permanent termini. We're building a network back home."  

"...You can make it permanent? Is that a variant of the common permanency spell or is it built on specialized magic items? If it's items are they permanently linked or reconfigurable - "

"... I think I endorse spending time on this right now, because you are a friend of my future self but I don't actually personally know you all that well, yet. But maybe you'd rather we get acquainted in the course of winning the shining crusade and breaking prophecy."

"Very unwieldy, specialized, non-reconfigurable magic items. I'm working on improving them.  'Magic item' might actually be giving you the wrong impression – I adapted the design from a Tien ritual working – 

I'd think being able to move troops across a continent in hours would be useful for winning the shining crusade. I have a few other ideas along those lines, but they might want to wait until I can meet the rest of your war council." 

"Shall we do that now?

- I would, all else equal, prefer to talk to Vakkad first and get that diamond, probably on the promise of a future teleportation circle after the church has had time to set up enough goods to flow through it. Not for strategic reasons, exactly, it's kind of petty but there's - well you'll meet him soon enough and I aughtn't bias you."

"A permanent set would take months without my usual staff, and they're expensive. If you just mean casting the spell – where could we do it that's really surprising?" 

"Yes, just one casting. Presumably Absalom to - Somewhere deeply inland in Tian Xia? I don't know what the major cities there are, I haven't had a chance to visit the continent. Yet."

"Oh, you'll get there. Probably they haven't moved too much."  

"You are going to be constantly teasing me with your greater knowledge of my own life story than I have, aren't you."

Plane shift?

"Sometime I have to tell you about this spell you invent to turn people into books. Useful, that."

Plane shift! 

Tilbun, with a little more explanation, agrees to lend them a diamond now in exchange for a 200-minute portal between Absalom and Changdo in a month when the Abadarans have had time to sort out which goods they want to send each way. She sends Iomedae notice, that she'll be back shortly with news and a guest, so that she can get the other commanders assembled while she and Élie wrap up negotiations with Tilbun and teleport over.

She glides into the tent, tosses the diamond to Iomedae, and drops a +1 longsword in front of Pereza.

"That's somewhere around four thousand percent interest per annum and if that doesn't satisfy you I give up."

Private Sanctum.

"I would like to introduce Élie Cotonnet, ninth-circle archmage from the future. Yes, I checked, he's not Mephistopheles, that's why I needed the diamond. I'll let him explain the rest."