Mordenkainen's Lost Notebook

Fever Dream

5-level Illusion

Choose a target within range which can see and hear you. That target must succeed on a Wisdom saving throw or it breaks out in a cold sweat as a burning fever sinks into its mind. It immediately gains a level of exhaustion. In addition, a creature which fails the Wisdom saving throw has difficulty focusing its mind. Each time it attempts to cast a spell or concentrate on one already cast, it must make a Constitution saving throw. On a failure, concentration is lost or the spell fails. When the spell fails, either at the end of its duration, you dismiss it, or it is dispelled, the target is stunned until the end of its next turn.   If the target of fever dream is already suffering the effects of a luminous swarm or prickling torment spell (q.v.), the saving throws for fever dream are made with disadvantage.