Cerebral Overload

Sends a flood of information into a target's mind, overstimulating them and causing a mental overload. The target must make an INT saving throw, or take psychic damage equal to your spellcasting modifier. This spell deals an additional 1d4 psychic damage for every instance of it in your prepared spells, including this one (from class spell lists, feats, features, etc.).

At Higher Levels: This spell deals an additional 1d4 psychic damage per instance upon reaching 5th level (2d4), 11th level (3d4), and 17th level (4d4)