Super Power: Dim.

“Yes, dim – that was really the best word for it, although others sometimes came to mind: ghostly, unobtrusive, transparent. Invisibility was out of his reach, but by first eating a pizzle and then reciting a number of spells, it was possible to become dim. When one was dim and a servant approached along a passageway, one simply drew aside and stood still and let the servant pass. In most cases, the servant’s eyes would drop to his own feet or suddenly find something interesting to look at on the ceiling. If one passed through a room, conversation would falter, and people would look momentarily distressed, as if all were having gas pains at the same time. Torches and wall sconces grew smoky. Candles sometimes blew out. It was necessary to actually hide when one was dim only if one saw someone whom one knew well – for, whether one was dim or not, these people almost always saw. Dimness was useful, but it was not invisibility.”