Brutal Rebuttal

You unleash a string of insulting responses to undercut and embarrass a creature casting the Vicious Mockery cantrip. If the target can hear you (though it need not understand you), it takes 1d12 psychic damage and has disadvantage on attack rolls and ability checks it makes before the end of its next turn. Additionally, the creature originally targeted by the casting of Vicious Mockery automatically succeeds on its Wisdom saving throw. 

This spell's damage increases by 1d12 when you reach 5th level (2d12), 11th level (3d12), and 17th level (4d12).