So, I was reading the BESM core book and thinking.. What if I wanted to build a cursed weapon? Something that the user could not get rid of. Maybe he has to feed it the souls of those he defeats or whatever. And also thinking about using a limiter as it sounds.. Preventing someone from using the full scope of their powers. Maybe a spoken phrase could unlock the limiter. This might be a story device where NPCs who can't control their powers, or can't use the full scope of them without causing city-wide damage, can live normal lives using only a fraction of their magic, psychic powers, etc. But that raises the thought of doing a nullifier bracelet or object preventing evil NPCs from using any of their powers once they captured by the super police or whatever.
None of these concepts are new, but they are useful in answering questions someone might ask about the sociology of a metahuman society (AKA Devas, Capes, Aces, or whatever) could potentially function. Some of those magic items come with a price, and some divine humans much power and little control. And somehow you have to incarcerate the supervillains, right?