Amulet of Auto-chastisement

At the start of your opponent's Shooting phase, select one enemy VEHICLE unit (excluding TITANIC units) within 12" of and visible to the bearer. That unit must take a Leadership test. If that test is passed, until the end of the phase, each time a model in that unit makes an attack, subtract 1 from the Hit roll. If that test is failed, that unit is not eligible to shoot this phase.