Choose one creature within range that you can see or hear. The target must succeed on a Wisdom saving throw or become cursed for the duration of the spell. When you cast the spell, choose a topic of conversation. While the target remains cursed, whenever it attempts to speak about the chosen topic, you, or this spell, a phenomenon of your choice spills forth from its lips instead of words:

• Tiny toads, snakes, moths, or other vermin
• Short-lived wildflowers in full bloom
• Black filth or bile
• Fairy tales and nursery rhymes
• Unflattering, unrelated truths about the target or those they are addressing.

Attempts to circumvent the curse by writing about the subject result in crude drawings of the chosen phenomenon. If the target can communicate telepathically or another creature reads its mind, it can communicate about the curse that way.   If you have caught the target in a lie, or if you have done it a kindness and receive no thanks within 1 minute, the target has disadvantage on its saving throw, the spell doesn’t require concentration, and the effect is permanent unless removed by a remove curse or greater restoration spell, or similar magic. You can also choose to end the spell by using an action to dismiss it.