Use this Strategem when a Grey Knight unit from your Army that is not a Vehicle or a Servitor is chosen as a target for an attack. Until the end of phase, when resolving an attack made against that unit, an unnmodified wound roll of 1-3 always fails, irrespective of any abilities that the weapon or the model making that attack may have.
Use this Stratagem in the Fight phase, when a Grey Knights Paladin unit from your army that has not been chosen to fight with this phase is chosen as the target for an attack. Until the end of that phase, when a model in that unit is destroyed, then before that model is removed from play it can fight as if its unit had been chosen to fight.
Use this Stratagem when a Grey Knights Land Raider model or Grey Knights Storm Raven Gunship model from your army is destroyed. That model can either automatically explode (do not roll a D6), shoot with one of its ranged weapons as if it were your Shooting phase, or make one attack with one of its melee weapons as if it were the Fight phase (use the top row of that model's damage table when shooting with that ranged weapon or resolving that attack with a melee weapon).
Use this Stratagem in the Fight phase, when a Grey Knights Paladin unit from your army that has not been chosen to fight with this phase is chosen as the target for an attack. Until the end of that phase, when a model in that unit is destroyed, then before that model is removed from play it can fight as if its unit had been chosen to fight.
Use this Stratagem in the Fight phase, when a Grey Knights Paladin unit from your army that has not been chosen to fight with this phase is chosen as the target for an attack. Until the end of that phase, when a model in that unit is destroyed, then before that model is removed from play it can fight as if its unit had been chosen to fight.
Use this Stratagem in the Fight phase, when a Grey Knights Paladin unit from your army that has not been chosen to fight with this phase is chosen as the target for an attack. Until the end of that phase, when a model in that unit is destroyed, then before that model is removed from play it can fight as if its unit had been chosen to fight.