the user can make other people protect information about them, it can be about their ability appearance, or even anything that even relates to them.
as long as its something the user dimmed a 'secret' this ability can make someone unable to share it or even imply it, when the victim of this ability somehow is able to talk about something the user dimmed 'secret' he will die before saying it
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think of it like its the return from death of Subaru and how he can't talk about it
C ya guys later