So at around the end crystalis when you fight morganth you can side with her. This will make it so guarded wizard city areas are unassailable places that you helped out IE every world will accept you.
Now, for the good stuff What happens after you make the decision to help her? More wizards come to kill morganth you help her and you make a run for it. You continue to thwart opposition in multiple worlds taking out pigswick teachers, marleybone governors, mooshu warriors Ect... As you go along taking out powerful figures people (obviously) will not like you. This is why i propose a world called the black market; It contains a bazaar, crafting teachers, school teachers and gardeners. Yes KI this will take work SOMETHING that you guys don't particularly don't like unless it invovles profit but it does... temptation to replay the game to take this path. (I.E lots of money)