Whispers of the Witch

You utter bewitching whispers for the duration, enhancing your attacks and bolstering your defences. Until the spell ends, you have advantage on the next saving throw you make against being Charmed or Frightened, and your melee attacks deal an additional 1d6 Psychic damage on a hit. In addition, immediately after you take damage from a creature you can see within 60 feet of yourself, you can use your Reaction to force the creature to make a Wisdom saving throw. On a failed save, the creature has disadvantage on attack rolls against you until the end of your next turn.

Using a Higher-Level Spell Slot. The Psychic damage increases by 1d6 for each spell slot level above 3.