The magic system they used was a hybrid of the Warhammer Fantasy RPG one.

Most of my feelings on the magic system can be found at:
http://www.glencook.org/index.php/Review_d20

It's been a while since I looked at it, but read Lady's write up again.  I could be wrong, but under those rules she shouldn't have been able to reach her rank without being Taken, which she wasn't.

Oh - and if you can ever convince a DM to allow you to play a "dominator" character (with the bonus stat adds and the rest), do it!  That little write up where you get all those bonuses (2 stat adds every three as opposed to one every 4) is ridiculously over powered.

Richard