You've been practicing your crowd work and it shows!  You unlease a string of insults and innuendos that force a create to make an intelligence saving throw.  On a failed save, the target takes 7d6 psychic damage and is incapacitated until the start of your next turn.  On a successful save, the creature takes half as much damage and isn't incapacitated.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d6 for each slot level above 4th.