"Just the person I want, then. What can she do that might interfere?"
"Is directly attacking me the kind of thing a sorcerer is likely to think to do?"
He doesn't bother continuing to interrogate. He'll have a more knowledgeable vassal soon.
He can skip over the boring period by filling a zincmind; he does that for most of the relevant time and then returns to the cave to wait for Verve. This shows a complete lack of regard for the fairies under a "take no new action" order, but he'll come back for them eventually.
The Lord Ruler makes himself faster than he's had reason to be in a long time. He's confident a human wouldn't have time to so much as blink, but it's best to be on the safe side. He doesn't see Verve's atium ghost doing anything that looks magical, or the real Verve for that matter, so he rushes her and claps a hand over her mouth. While dragging her back toward the cave, he tries to keep her disoriented enough that she'll have less of a chance to cast something.
Once he's back on Scadrial, he summons some powdered pewter (useful in combat, hence its presence) and starts maneuvering it down Verve's throat with magic.
Does that make it not count? Alendi has no idea. But he can test it. "Stop resisting." And does it again whether she stops or not, because obedience could be a trick.
"Take no new action except for saying true things in response to my questions. Give complete answers and do not leave out any information relevant to one of my questions that you think I'd want to know. Got that?"
"First question: Do you want to keep working for Thorn? I've heard he's pretty terrible to his minions."
"I'm not going to bother with a recruitment pitch when I have you and he doesn't, but I'm pretty sure I'm less sadistic. Anyway, I plan to capture him. What sorcerous defenses does he have that might prevent me from getting to him?"
"His court structures and the routes between them are all but impassable to anyone he has not had expressly written in as an exception. Sorcerers are hidden in several places and will attack unauthorized passers-by. There are automatic traps in and around the buildings that will injure or in your case kill anyone who doesn't know how to bypass them. He will heal automatically from any harm you do and can pass through solid objects at will, including your hands, if cornered."
"Which of those defenses can you neutralize?"
If you can't stop the intangibility thing, are there other sorcerers who can? Or, if I put some food inside an intangible fairy, would that count as feeding him?"
"I know that a sorcerer has managed to get through the wards before but I don't know how. Blossom could probably prevent Thorn from going through things if she tried. Intangibility is not the same as going through things, but if he managed to make your food pass through him I don't think it would count."
And what do these wards do that takes a sorcerer to get past?"