Blessing of Zybilna

Once per short rest, you can mutter the special word given to you by your patron to psychically lash out at one creature you can see within range, making them see, hear and experience a disturbing vision of your choice. The target must make an Wisdom saving throw. On a failed save, it takes 6d4 psychic damage and cannot use its reaction and bonus action till the end of its next turn. On each subsequent turn the target takes an additional 3d4 psychic damage. On a successful save, the target retains the use of their reaction and bonus action. The target repeats its saving throw at the end of each of its turn. 

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, you can target one additional creature for each slot level above 2nd. The creatures must be within 30 feet of each other when you target them.