Curse of the Unfooled

You curse a creature with an extreme level of skepticism, convincing them that nothing can make a fool of them for an entire day.

A creature you can see within 60 feet of you must make a Wisdom saving throw. If the target succeeds, it is immune to the effects of this spell for 24 hours. If it fails, it begins to see everything magical as a potential illusion and everything anyone says to them as a potential falsehood.

While the curse is in effect, the target automatically succeeds on saving throws made against illusion spells. However, it also firmly believes that creatures, objects, and effects it witnesses being created or summoned by magic are also illusions. Until the target has been physically harmed by a specific magic-made effect that it believes is an illusion, the target has disadvantage on saving throws against that effect, and attack rolls from those spells or summoned creatures are made with advantage against the target.

Additionally, the curse causes the target to think that everyone could potentially be lying to them, even close friends and family. The target is determined not to be fooled, but any Insight skill checks made to determine this reveal that other creatures are being untruthful, reinforcing the target's initial feelings of mistrust.

At Higher Levels. If you cast this spell using a spell slot of 5th level or higher, you can target 2 creatures (5th level), 3 creatures (7th level), or 4 creatures (9th level).