Is this merely a plot device, or did you have something else in mind?
Usually such an element is related as a plot device in the game.
In fact, it's pretty much this show's standard plot device.
This action has been used as a plot device in war stories.
The basic plot device was the kind of thing everyone has seen a dozen times on television.
He is such a sorry plot device that no more will be said of him.
Yet he probably wouldn't have used this plot device six months earlier.
"It was a plot device rather than something we were trying to make a huge issue of."
However, it is remarkable because of several new plot devices used by the author.
However, in some cases the works themselves serve as an important plot device.