Distractify

You create a sensory effect with the intent to alter the outcome of a creature's actions.  This effect can manifest as a light in the eyes of an attacking archer, the sound of a snapping branch beneath a tree-climbing assassin, a gut-wrenching flatulent smell to a performing bard, or other such effect which you imagine.   The target must succeed on a WIS save versus your Spell Save DC, or else roll a d4 and subtract that total from its attack or ability check.   

You may take this reaction after the target makes its attack roll or ability check, but only BEFORE the result of that roll is announced. 

Once a creature has been affected by this spell, it can not be affected by it again for 1 hour.