Taboo

The caster utters the words describing a subject, event, creature, name, or an object, and places a taboo on it forbidding any creature across all planes of existence from speaking of it. Any creature regardless of location or current plane of existence who attempts to talk, scribe, or by any other means communicate with another about the tabooed topic must succeed on a Wisdom saving throw or fail to utter a single word on the matter and their mind clouded. They can not attempt this roll again for another 24 hours. On a success, they slowly stumble through speaking about the tabooed topic but take 1d4 psychic damage and reduces their maximum hit points by the damage taken. Once the conversation is over, the creature must make another roll if they wish to talk about it again that day. The caster and the topic (if it is another creature) are exempt from this taboo. Once a taboo is place it remains indefinitely, and can only be removed by means of a wish spell.