Cube of The Rube
Wondrous Item – Rare
An odd puzzle of moving parts, but the solution is simple: there’s no way to solve it, it’s an evil cube created by demons! A creature that touches the Cube of The Rube must make a DC 15 Intelligence saving throw or become incapacitated for up to one minute, spending each turn attempting to solve the puzzle.
At the end of each turn, a creature can attempt the saving throw again. On a success, they realize they’ve been bamboozled and are no longer incapacitated. After the effect ends, creatures are immune to any future effects from the Cube of The Rube and they will likely try to smash it (unsuccessfully).