How about a spell for DnD Next? How about a nice cantrip…
Enchantment cantrip (mind effecting)
Casting Time: 1 action
Range: 60 Ft.
Duration: 1 round
Target creature makes a charisma saving throw. If it fails, it is racked with doubt. On its next turn all attacks and skill checks are made with disadvantage. If cast as a first level spell the target takes an additional -1 to the rolls. For every level cast above first, increase the penalty to the rolls by one.