Wondrous Item – Rare
When the holder of the Calvinball touches it to a susceptible creature, the creature must succeed on a charisma saving throw of 12 + the user’s charisma modifier or they are forced to obey an if/then rule of the user’s choosing for up to 24 hours. The rule cannot cause immediate death (ex: if you have a thought, then you kill yourself), but it may cause harm if the dependent action the creature takes is within their control (ex: if you are about to attack someone with your sword, then you attack yourself instead).
Only one creature may be under the effect of the Calvinball at a time, and the rule-setter may dismiss the rule as a bonus action. Additionally, a creature may only be under the influence of one rule at a time and the rule may be a maximum of one sentence in length. The user may not create the same rule twice.