In the Declare Battle Formations step, you can select a number of Legionaries and Cultist Mob units from your army; until the end of the battle, those units, and any Character units attached to them (excluding Epic Heroes), have the Infiltrator ability. The maximum number of units you can select in this way depends on the battle size, as shown below.
Battle Size | Legionaries | Cultist Mobs Incursion | Up to 2 units | Up to 2 units Strike Force | Up to 3 units | Up to 3 units Onslaught | Up to 4 units | Up to 4 units
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