So today I decided to buy a MW30 book and try my luck:
In the picture above, you can see my MW is currently at level 20, with +1 level from the Leafre card set. But when I double clicked my MW 30 book, I got an error notice saying "You cannot use Mastery Book":
I've tried relogging, changing locations, changing the Crusader Codex card set so I don't have +1 skill levels, but the end result is I still can't use the MW30 book.
So, what I'd like to know is if there is a glitch with MW30 books with Mihiles (and other classes), or is it just me?