[Oddwen]

The main protagonist should have to go to a primitive people because of some

A. An incureable disease
B. His/her wizard mentor told them to
C. His/her girl/boyfriend told them to
D: It was on the way to defeat the big bad dark lord/lady

Said protagonist must incur help from said primitive people, but the help they are willing to offer is never good enough, so Protagonistagon must forcibly bring the primitive people into some form of modernity, just because he/she feels it's best. Any tactic will be used, from threatening the natives with his scorn ("Oh no! Not that!"), to threatening that they will be overcome by the dark lord/lady if they do not do exactly what he says, to killing the people in charge and placing his girlfriend in charge.

Even Tolkien did this, to some degree, though it was needed. Namely, Gandalf casting Wormtongue out.

Oh yes, and

The Wizard Guide has to die or go on some secret quest of his own, leaving the main character helpless at the climax of the book.