At a terrible time, Lena finds herself holding the amulet just as she has a strong inner thought or desire -- something she wishes someone else would do, such as shut up or go away or anything both negative and unlikely. The person she is thinking of then feels a horrible mental pressure to do just that very thing. They don't have to succumb (what with godmoding being bad, and all), but the mental impulse is undeniably there. Of course, using the amulet like this can prove terribly corrupting, can't it? Especially if she needs to wish people would stop investigating this very powerful artifact of forbidden Dictation she possesses...

The trick to truly regaining the amulet is to use it on herself, by forbidding herself from using it like that any more or something similar. Once she does that, all these effects vanish, and everything is back to normal.