[quote=@Yankee]
Not sure how to go about the "special boon" for masters. Would this equate to just a really strong skill/spell they have, or should it be more specific? I was planning a rune user (not primordial) so would it relate to their area of magecraft or could it even be a really strong mystic code?
[/quote]

There's a list of suggested boons in the first post. Superior magical skills is one, as is a superior mystic code, but you are not limited to just things on that list as far as I can tell.