Purgation Sweep

Use this Stratagem in your Shooting Phase, when a WITCHSEEKERS unit from your army is
selected to shoot, or in your opponent's Charge
Phase, when a WITCHSEEKERS unit from your army is selected to fire Overwatch. Until the end of the phase, add 1 to the Strength Characteristic of witchseeker flamers models in that unit are
equipped with.