Vitriolic Mockery

Your connection to the power of musical ability and artifice bolster your Vicious Mockery cantrip. Upon casting this spell, you deal 6d4 psychic damage to a target within range regardless of whether or not it can hear you. By sapping the psychic energy of your target, you grant yourself advantage on your next saving throw and disadvantage on your target's next saving throw. 

This spell's damage increases by 2d4 by each level you upcast it at.