Leviathan Siege Drill

If a model has this special rule, or is attacking with a Melee weapon that has this special rule, it rolls an additional D6 for armour penetration in close combat.

If a model makes a shooting attack with a weapon that has this special rule, it rolls an additional D6 for armour penetration. In either case, this special rule has no effect against non-vehicle models.

Reroll failed penetration rolls against buildings and structures. Also adds +1 to building damage table.