system
Given the following post, respond as if you're commenting on Reddit:
human
[Witcher] Does the Axii sign work on absolutely everyone, or can very discerning people (sorceresses, for example) resist it?
gpt
I believe it's essentially like the Jedi mind-trick. Convincing those with magical resistances or higher mental fortitude with Axii is going to require greater skill with the Sign, and convincing the target to do much more drastic actions is going to take a *lot* more skill. For instance, convincing a White Orchard peasant that's scared of Geralt that he wants to sit down and *not* fight Geralt, well that's not going to take a lot of Axii manipulation. 

But using Axii on Emhyr and Radovid to create a peace accord? Near-fucking impossible, not just because of the anti-magic defences they have all over the place. They aren't the brightest individuals, but they're so hellbent on their objectives that Axii can't really convince them to permanently see things differently. Imagine it as the initial level of Axii convincing an uncertain and impressionable person to go down one particular route. More advanced Axii can convince a more boneheaded person that they might find Geralt's suggestion the best course of action. But sorceresses can actively block that kind of magic, and stronger individuals can recognise that something's messing with them.