Day of Inversion

You point a finger to a creature and loudly proclaim the beginning of a day of inverted meanings.

It must make an Intelligence saving throw. On a failure, you and the target are cursed apply the following effect for the next 24 hours, or until the next dawn (whichever is sooner):

Whenever this creature tries to communicate, whether that be verbal, nonverbal, or written, they must make an Intelligence saving throw. On a success, they say what they meant accurately. On a failure, they instead state the inverse of what they intended.

If there are multiple ways in which a statement could be inverted, it is left to the DM's discretion, but note that the nature of the curse will tend to select whichever option is most harmful to the affected creature.

The curse is aware of the creature's intentions, and thus resists attempts to circumvent it by trying to say the opposite of the intended statement. For example, if a creature wants to indicate that it is friendly and tries to say "I am an enemy" to get it inverted to "I am a friend", the curse will instead attempt to instead make them say "I am an enemy".

Similarly, if another creature knows of the curse and begins to interpret the affected creature's statements as their inverse, the curse will instead make the affected creature speak normally.

Any spell or ability which can remove curses can end the curse early. If it does, both affected creatures are no longer affected.