This is the reverse of the zone of truth spell. Everyone in the area of effect knows immediately that they can speak only lies. They can decide exactly what they say and how they say it, but every statement must be a lie. Because questions, suppositions, and exclamations are not statements, they are not affected. The DM should carefully examine every statement and classify it as true, false, or an exception to the spell. For example, the statement “I can only lie” is a true statement under the influence of this spell and, therefore, cannot be spoken.
Notes: Common on the Demiplane of Dread; used mostly by evil priests.