You remember that saying about blondes? That thye're really smart? Oh, no, wait ... not smart, the other thing.
Dumb teachers make dumb students. Starting with a level 33 Urghat mentoring, this created a level 31 griffin-brained heroine with spellpower 1 and knowledge 2.
Moral of the story: work hard and develop your heroes properly. Don't be lazy and look for shortcuts via mentors and trees ...

Thanks to cjlee.