It's definitely within Leareth's power to do that. His organization has hundreds of mages, some of the most skilled in the world, and a lot of resources. The war in Valdemar had to be incredibly overdetermined. He's - not happy, obviously, about this potential threat, but there's still a quiet note of background relief, he would much rather use those carefully-accumulated resources of centuries to protect Velgarth from the dangers of another world than to conquer Herald-Mage Vanyel's kingdom. 

(He's thinking quietly, in the back of his mind, that he doesn't follow why the magic involved in immortality would involve making someone selfish, though the rigidity makes more sense to him. Need's version of immortality includes that, and it's something he was concerned about for any option involving storing his own soul in an artifact. ...He's not going to think in detail about what his method actually involves, where she can see it. She wouldn't like it. He doesn't like it either. But - an echo of memory, stars and a tower and a vow he made to never give up never walk away until the work was finished - and centuries of careful, meticulous recordkeeping, relearning everything each life, checking his reasoning against earlier documentation, keeping himself intact - he's really quite sure it hasn't changed what matters to him.) 

What will her allies do, if they come looking for her? Will they identify themselves, or do they have characteristics he can keep a lookout for, to know who it's safe to contact? 

They are also dangerous to scry and will probably not act openly, unfortunately. They will be living rather than dead.  She - thinks they'd have arrived by now, if they had a way to come at all. They will back down on learning she's in talks with him, and he could consider going around with a note in Taldane he can show her people, as proof they're in contact. She'll write a quick one. 

Leareth is a Lawful Evil archmage engaged in trying to bring a god with human values to this world, which has none. We are in talks, and I ask that you regard him as a prospective ally.

That seems reasonable. He's grateful for it. 

...He would feel better about this if they had a Telepathic Bond for it. Less because he expects Iomedae to learn anything critically time-sensitive in talks with Valdemar, and more in case of unknown unknowns. 

Then she'll concentrate briefly and - pull out, as if it were folded away somewhere, an enormously complicated and powerful spell and extend it to Leareth as if to slip it around his shoulders.

It's beautiful to watch. ...And would be fairly nerve-wracking, if not for the anti-fear effect, but as it is he's just observing quietly that under normal circumstances, letting someone he just met cast powerful magic on him would be an unacceptable risk, and his habits don't like it, even though in this particular case he is really quite sure that his habits are out of date and it's worth it. 

She's still letting him mindread her, in case that's helpful. Her intent is uncomplicatedly to deescalate the immediate emergency and then work with him on evaluating whether he wants Aroden here and relatedly ask him for help getting back to her own war.

It's helpful. He does want her to know that it's not necessary, he already has enough to go on for his decision to trust her - so much more than he could reasonably have asked for, or at least that's how it feels right now - but the habit of paranoia goes deep. 

He has a lot of resources that he might be able to offer for her war, once he knows more about it, and of course once they have the ability to travel between the worlds at all. 

- and that's a decision to be made later, he thinks. For now, he wants to get her back to Valdemar. - and warn Kilchas a couple of seconds before the midair Gate, but he can do that from here if he uses the communication spell mage-technique rather than Mindspeech, it's less secure and easier to spoof but he's not going to be saying very much and Iomedae can verify everything as soon as she reaches him. 

Is Iomedae ready to go? 

Yes. (Looking forward to it, no. She has so many questions for this man, and so much she wants to tell him. But - ready, yes.)

He's reluctant as well, but that doesn't mean it makes sense to hesitate. 

:- You should try very hard to avoid visiting Haven in person: he tells her, after a moment. :And - I would appreciate it if you can convince the Heralds, especially Vanyel, to evacuate it. I doubt the Star-Eyed will destabilize the Heartstone there if it will not even harm either of us and can be quickly verified to be - not my doing - but nonetheless.

- and, one moment.: 

Scry for Waymeet, find Kilchas - he's not incredibly hard to find, he's still where the Gate dropped him and Iomedae - and target the communication spell. <This is Leareth, returning Iomedae. This is time-sensitive and so I am Gating her to above you. I swear I intend nothing else.> 

He'll wait about three seconds and then raise a Gate on the doorway of the conference room, and an unscaffolded midair doorway-sized vertical Gate on the other end, so Iomedae can step through rather than being rudely dropped. 

UM. 

...Kilchas is not going to run outside because that won't help with anything and might expose him to an attack. He's so confused. He'll...wait, very tensely. 

Iomedae immediately steps through. She like Leareth has no habit of doing things hesitantly because she doesn't particularly want to do them.

:This is Iomedae. I'm fine, and you may verify that if you possess the means. I apologize for startling you.:

Aaaaaaah! This is - probably technically better news than an immediate Final Strike through that Gate - but Kilchas is so confused and concerned. 

:Are you hurt? Did he do anything to you? What caused the earthquake?: He would like to ask all of that under Truth Spell but Iomedae isn't in range for it yet. 

She is hurrying over. :I am not hurt. Leareth believes the earthquake was caused by the gods. It injured him pretty seriously. He Gated me briefly to one of his facilities and gave me a lot of protective magic items and let me read his mind while he repeated the claims he wasn't responsible for K'Treva Vale's destruction or Savil's death. And he warned me there is a Heartstone in Haven and it could be destroyed like the one in K'Treva Vale, especially if the gods thought they could kill me that way, though hopefully by now they don't think that.:

UM. 

:He - what - he's claiming the gods caused the explosion in k'Treva? But - that's - they're the Star-Eyed's people -: 

:He thought -

He...hadn't, actually, thought the Star-Eyed Goddess would do that. Those were Her people, sworn to Her in a millennia-old pact, who had spent their entire lives working at great risk to themselves to cleanse the Pelagirs on Her orders. He...suspects it would have required more setup than a few minutes' worth, and that it wasn't just aimed at killing Iomedae, who surely the Star-Eyed could barely see. He doesn't know what the original goal would have been. He's uneasy about it. 

I believe him that it wasn't him. If he wanted to destroy me, he's now had the opportunity.:

:We'll that's horrifying.: And it seems absurd, but...he doesn't, actually, think that Iomedae is lying, even without a Truth Spell to confirm. It's hard to lie in Mindspeech, and - it never made that much sense as an explanation, that Leareth had somehow blown up k'Treva on five minutes' notice to kill a woman he knew nothing about. Surely he would have kidnapped her, if he were hostile, just as a way to learn more... And it's not like there's anyone else he can think of who could have done it, which leaves only the dark looming absurdity that he can feel Rohan flinching away from in the back of his mind. 

:Gods. - Is Leareth all right, you said he was injured?: 

:I used the same healing magic on him that I used on you. He's fine now, though I am alert to the possibility I'm being induced to spend that resource down. I cannot get it back, here.

I don't think Leareth wants a war. He said my world changes everything, which it does, and that he'd stop his current plans just to see if it gives him alternatives, even if I weren't offering one directly in the form of Aroden being the kind of god he may want. So my current priority is to make sure Valdemar isn't forced into starting a war, and to investigate the safety of Haven while going nowhere near Haven. I also asked him to look out for my enemies, in case they followed me here.:

It's probably not the most important question to be asking right now - and it's a big question, and maybe an impossible one to answer - but Kilchas is already trying to keep track of enough urgent items that he needs to check once he's in range for a Truth Spell. 

He hadn't expected Leareth to let Iomedae read his mind. He wishes he could read Leareth's mind. Whether or not Vanyel is going to have to end up trying to kill the man, it seems like there's got to be a lot in there. 

:I don't understand Leareth: he sends. :How - how someone could want the things he claims to want, and - still have done all the things he's done. I mean, he made a cursed artifact that summoned hundreds of abyssal demons to go after all of a target's relatives, once. I don't - does he make any more sense to you?: 

:He actually - reminds me of someone I do know, from my own world. Or - a way she could be, if she didn't have a way to be something better.:

:Don't you always have a way to do something better? The Heralds don't summon demons, or use compulsions.: 

:If what was done to that village was done by its own god, then - I don't see how the Heralds can be sure their god is not, actually, willing to destroy them or misuse them, and I don't see how anyone in Haven is safe.:

Well that's upsetting. ...Not like the rest of this wasn't already upsetting. Just. 

(You can't fight the gods. Right? It would be like - deciding to fight the weather - no that's the wrong metaphor, weather-magic exists - but it's fighting something you can't win against...

- and however impossible and absurd it sounds, Leareth has pretty clearly set himself toward that goal. And Iomedae - seems sympathetic about it.) 

Kilchas still doesn't know what to say, so - he's just going to wait at the doorway of the town hall until Iomedae reaches him. 

:The thing my friend would say would be that - that there's something fundamentally and terribly wrong there, something ...like a world that kills everyone at age ten because it is threatened by what they'd become if they grew up. A world using people as things, and carefully limiting them as people so they don't become less useful things.:

And she reaches him. 

...He's going to cast a first-stage Truth Spell, looking very tense the entire time. 

:Can you, er, repeat all of the things you told me on the way here? And say what you're planning to do next?: 

:My Law spell suggests Leareth is a person who does not betray his sworn word. Leareth asked for and received my permission to Gate me out from the earthquake to a research facility. There, I read his mind, which was consistent with what he has been saying, that he didn't kill Savil or destroy K'Treva Vale and that he believes the Star-Eyed Goddess did it. I'm planning to try to communicate this to people to prevent a war, and determine if Haven is in danger, without going near it, because I'm worried that there'll be another explosion. Leareth expected I would face assassination attempts if the gods saw any way to succeed.: