The best answer to the question: Which is a game story device? Would be: Scripted event.
Explanation:
Creating stories in the form of games is no easy feat, especially because of the characteristics that this form of storytelling takes. In order to prevent a game story to become uninteresting, and even boring, creators must take into account the need to use a set of devices that will prevent such a thing from happening. First, the stories must be interactional, which means, they invite a player to engage in the story and become an active participant. They must be non-linear in their story, they must promote levels of collaboration and also player control. Among such devices that can be used by game story writers we have scripted events, which are defined as small moments of dialogue, or of action within the game that permit a player to acquire the backstory of the game, see character development or redefine his/her goals in the following stages of the game.
