Concept: an RPG magic system that inverts the traditional paradigm such that huge, flashy, overwhelming effects are easy, and small, subtle, tightly controlled effects are hard.
Cutting a troll in half with a laser? An apprentice’s trick. Illuminating a dark room? Now that’ s difficult.
Completely overwriting a person’s perceptions and trapping them in a false reality of your own devising while rendering their true body comatose? Easy. Turning yourself invisible? Hard as balls.