I am thinking about starting a new "Dresden Files" campaign using Hero. For those of you who do not know the Dresden Files is a series of sci-fi/fantsay books authored by Jim Butcher about a gumshoe wizard in modern day Chicago. It's a fun set of books to read. There is also a new TV series on the sci-fi channel based on the books but I haven't seen it.
Anyway, to my rule question:
Dresden can cast spells, but often he uses a focus to augment and control his ability. For example, to cast a fireball effect he has a magical rod (OAF). However, he can still use his abilities if he loses his focii, although they may be uncontrolled. They may be overpowered, underpowered, have a wider area of effect than intended, takes him longer to cast, require more focused concentration, etc. How would one simulate this in Hero? With the OAF limitation, if you lose the focus you lose the ability until you regain the focus. In Dresden's case his powers become dangerously uncontrollable or unpredictable.