I had an idea for a magic item for a campaign that I'm going to be running. Here is the idea.
I want someone to give all the character "Rings of Communication" so that they can chat with each other and stategize from a distance. I want it to have a hidden element to it that let the one who gave it to them, track their movements and have effects on them (like Hold Person or the like). Is there a way that these other effects can be hidden from identify or detect magic and the like so that the character will not likely find out about these effects?
Yes. Use the second option- "a magic item of a kind you specify."
Awesome, thanks. What about the communication part? Is there a way to make it so that someone can eavesdrop on the rings from long distances or other planes?