The ring of questions: As I recall, it was a ring that you could get the answers to questions from. Put it on, ask yourself a question, and you’d get the answer. Like a ring of one wish, a ring of one question is likely to be frustrating.
The sword of inversion: Again, as I recall this meant that hits and failures to hit were reversed. That is, if you succeeded on your to-hit roll, that meant you missed, and if you failed your to-hit roll, that meant you succeeded. A great sword for klutzes.