Plot Screw

Plot Hex Machina.

A type of Plot Saver that harms the Good Guys by throwing an inconvenient enemy or roadblock in their way. This can be a Dragon that keeps them from reaching Grand Prize or the loss of a useful item like The Hero's Weapon. Even though it's negative, a Plot Screw is still a Plot Saver because it keeps the story's conflict from being solved too quickly and easily by the Main Cast. Plot Screws make people delay their plans or maybe even be enough to force them to postpone or cancel those plans. Essentially, Plot Screws prevent early wins from happening, always giving the Good Guys something to do other than loll around.