The Vexator Mask

Enemy units cannot fire overwatch at the bearer. In addition, at the start of each Fight phase, select an enemy unit within 6" of the bearer. That unit cannot fight until all other units that are able to have done so. If the unit has an ability that allows it to fight first in the Fight phase, it instead fights as if it did not have this ability. If both players have units that cannot fight until all other unit have done so, then alternate choosing which of those units to fight with, starting with the player whose turn is taking place