Art of Destruction At the start of each Shooting phase, the controlling player may nominate one friendly unit with at least one model within 6" of a model with this special rule. That unit gains the benefits of the Sunder special rule for the duration of that Shooting phase.
Sunder Attacks with this special rule may re-roll failed Armour Penetration rolls against Vehicles and Buildings (both with Shooting Attacks and in close combat) and re-roll Glancing Hits, in an attempt to instead get a Penetrating Hit, but the second result must be kept.