Ego Scourge

You strike at the mind of a creature you can see within range, attacking its sense of self. It must succeed on an Intelligence saving throw or suffer Disadvantage on attack rolls and ability checks, and cannot take the Magic action for the duration. At the end of each of its turns the creature can repeat this saving throw, ending the effect of this spell on a success.

Using a Higher-Level Spell Slot. You can target one additional creature for each spell slot level above 4.