Ring of Tongues (5e Equipment)
From D&D Wiki
Only a single copy of this legendary ring exists. This ring gives you the ability to speak and understand any language spoken for as long as they wear it, but when put on for the first time you must roll 1d8. Depending on the roll you got, that's the total amount of hours that you can wear the ring without voices protruding into your thoughts driving you mad allowing the DM take control of your PC until you finish a long rest. If you take off the ring, the amount of hours you have left before you go insane from wearing the ring do not change. For example, if you wore ring for 1 hour out of 4 hours, you can wear the ring for another 3 hours before going insane.