Imaginary Numbers

As a reaction when a creature would make an attack with advantage, you momentarily overload their action with imaginary possibilities. The creature affected instead attacks with disadvantage on that attack only, unless it is an Aberration, Celestial, Fey or Fiend where it then has disadvantage on all attacks until the start of its next turn.

After casting this cantrip, you cannot have advantage on any attack roll until the end of your next turn.