SIEGE MASTER
The Imperial Fists learned the breaking of fortresses before they learned anything else, and a fighter schooled in the craft knows that cover only slows a patient gun. When this fighter makes a ranged attack, the target gains no benefit from cover against it — no bonus to its save and no penalty to the fighter's Hit roll for the target being partially or fully obscured. Barricades, wreckage and rockcrete count for nothing against a marksman who has spent a lifetime shooting men out of their strongpoints. The wall the enemy hides behind is, to a Son of Dorn, merely the first thing to be cracked.