To the first question, I don't think so. To the second, Vexation is more about amplifying pain than inflicting it. So whether you inflicted that pain with magic or a sword doesn't matter.
Also, something I forgot to mention earlier. Krysus would only give Vexation to someone who caused pain regularly or caused a great deal of pain at once. So your character would have to do something very bad to get the mark in the first place. You may want to look into the negative form of the Gnosis. The negative side still makes you hurt people to live, but you are unable to amplify pain. However, you could get this for doing something good. Perhaps helping the Syrilian Knights find a member of the Mortanis or something like that. It is just something to think about, but I'd suggest, like the others, that you thoroughly read the wiki on
Gnosis,
Vexation, and
Krysus.