Or a good ol' magician with the Magic Fingers and Fling spells; and the Narcoject and Laes drugs. Fling a hypodermic needle into an unarmored spot, Magic fingers the needle away; end result is usually an unconscious person with no obvious traces. And then you have a whole slew of magic to work with that is not lethal.
Although, I'm not sure by the OP if the character is mundane or not, so that might not work.