...Altarrin nods, unsmiling, and lowers his shields, and waits. He's paying a lot of attention to what parse to him as the 'surfaces' of his mind, once his shields are down; he wants to see if he can notice Carissa's spell.
- aside from that, there are multiple threads of thought in his mind, that he's sort of bouncing between.
He's been trying to figure out what he could think about that would give Carissa the most information. His internal framing of it, right now, is very much not 'convincing Carissa to trust him'. He has that skill, it's a mode he can operate in, but it's not one he likes - or considers himself especially skilled at - and, in particular, it's not something he does with potential allies. (The distinction makes perfect sense in his head. It's mostly below the surface of what Detect Thoughts can read, but there are hints, that Carissa might be able to pick up if she pays close attention. ...To Altarrin, the true goal in an ally is someone who he doesn't have to manipulate into taking the correct actions. And it's hard, obviously, because Altarrin is hundreds of years old, and he so often has experience and context that make it obvious how everyone around him is wrong. Which is a terrible footing to start off a working relationship, and - well, he wants to know the ways that he's wrong, and convincing someone to trust him - based on anything other than verifiable information and theories - is not a good way to achieve that.)
He needs to figure out how to navigate the politics around Carissa's arrival and Carissa's abilities. So far, he's kept it fairly quiet. A number of people know that Carissa is from another world and has unknown magical capabilities, but they're either directly loyal to Altarrin or afraid to cross him. If he wants to draw on the logistical capacity of the Empire, though, then they need to bring more people in, and so this whole project will inevitably become political. (Internally, when Altarrin thinks that word/concept, it's almost a curse.) He would on some level prefer if Carissa could work directly with the mage-research division; he feels like it would be good for her, somehow, to spend more time with people who are trying to build things, trying to better understand reality, oblivious to whether or not their peers are scheming against them, whether their superiors consider them worth protecting -
(and, to be fair, the only reason they can afford that obliviousness is because Altarrin has spent precious time and social favors on it, but it's worth it, to have a pocket in the world where clever, creative people can focus on figuring out how things work and how to build something new and better...)
He's still deeply confused about her world, on multiple levels, but particularly its magic and its gods. Especially the things she said about how humans can ascend to godhood. He still isn't sure whether or not that could work in Velgarth, even in principle, but figuring that out one way or another is obviously a top priority. He's been mulling on it, and he still can't see how their mechanisms could be mapped over to Velgarth's magic - actually, he's still pretty confused about it. Neither eating the residue from a dead god, nor Carissa's non-explanation of the "Starstone", give any particular hints about where the information comes from, to take a human mind and reshape it into a god-level-entity's mind, while still keeping its original value-structure intact - though, actually, he's not sure Carissa actually claimed that, just that human-derived gods could "use more" of humans than the more ancient nonhuman gods...
He's curious about dath ilan. This is almost certainly a curiosity that he won't get to fulfill anytime soon, because the downside risk here is that dath ilan would decide to destroy all of Velgarth. But he still, on some level, desperately wants to learn more – about how and why their world developed the lessons that Keltham, an ordinary teenager stranded in another world, taught to Carissa, who then went on to explain it to him - and it felt almost like recognition, almost like being seen and understood, when he hadn't even been aiming for that...
....He's scared. This is not particularly a live thread of thought, in Altarrin's mind, but it's ever-present in the background. It's a fear that he's stared into the depths of, many times, and so if Carissa is paying attention, she can probably pick up some of its component pieces. Altarrin has always (almost always, but his thoughts bounce away from that brief interlude in Urtho's Tower, what little of it he remembers, and so Carissa isn't going to see even fragments of that) - he's always lived in a world hostile to his goals and values. A world that wanted to destroy him – at least since the Mage Storms, and he sees it, now, he gets it, what the gods of Velgarth are trying to protect, Owl's Wisdom is so useful for that – but he still can't talk to Them, not yet not until he burns millions of lives as fuel, even if he knows exactly what he would say...