Eldritch Insight

You attempt to impart unknowable secrets on a target creature. The creature gains magnificent insight into strange sciences and deep knowledge, but at a cost. An affected creature becomes somewhat incoherent for the duration, displaying a haunted or pained expression that might negatively affect strangers.

If the target is unwilling, they must make a Charisma saving throw. On a success, the spell fails. Upon completion of the spell, the target creature must make an Intelligence saving throw. On a failure, the target takes 4d8 psychic damage plus your spellcasting modifier, or half on a success.

The target creature adds the caster's spellcasting modifier to and has advantage on Arcana, History and Religion checks for the duration. The target creature also has disadvantage on Deception, Performance and Persuasion for the duration.

When the spell ends, the target creature must make another Intelligence saving throw. On a failure, the target takes 4d8 psychic damage plus your spellcasting modifier, or none on a success.

At Higher Levels. When you cast this spell using a 6th level spell slot, the damage is instead 6d10 Psychic damage plus your spellcasting modifier and the duration is 18 hours. When you cast this spell using an 8th level spell slot, the damage is instead 8d12 Psychic damage and the duration is 24 hours.