Taking a small crack at a Kryptonite-style move, if you want that kind of thing in your game. It’s a rough-cut thing that I haven’t played with, so take it with a grain of salt.
When you are exposed to your superheroic weakness, mark potential and choose one. The effect persists for as long as your weakness is present.
-Lose access to one or more of your powers.
-Your personality undergoes a radical temporary change. The GM will shift your labels.
-Take a powerful blow from the exposure, and mark a condition at the end of every scene.
I would change the last item to:
-Take a powerful blow from the exposure and then either take another powerful blow or choose another one of the options in this move for each scene following this that you remain exposed.
But that’s mostly just for my GMing style and narrative direction, it is still great.