This Nightmare is really cool on paper, but when used, it's lackluster. Giving "7 successes for Exceptional Success" doesn't convey the idea that what you do is worthless, and it's the basic effect of the Nightmare. It only gives the idea that excellence will be more difficult, but you usually don't need an Exceptional to do something.

Here's my fix.

Normal: The Beast chooses a type of action. This can be a trait category (Mental, Physical, Social), a particular field (combat, infiltration, research, etc.), or any other reasonably
broad category. Within...