Girdle of the Plain Question

Undyed leather, wide, with one iron ring at the front and no buckle, closed by a slip of the ring through itself.

Each charge lets the wearer put a single question to one creature that hears them. That creature cannot answer it with a lie, in any language, by any magic, or through any intermediary. It may refuse to answer at all. The iron ring rusts through and hangs open when depleted.