Integrated Tactics
(Rule)Description: Each time an ASTRA MILITARUM unit from your army is selected to shoot, you can select one enemy unit within 18" of and visible to that unit. If you do, until the end of the phase, models in that STRA MILITARUM unit can only target that enemy unit (and only if it is an eligible target) and that enemy unit is caught in overlapping fire. While an enemy unit is caught in overlapping fire, each time a GENESTEALER CULT model from your army targets that enemy unit with a ranged attack, add 1 to the Hit roll.