When rolling on the Destroyer Weapon Attack table for a weapon that has this special rule, subtract 1 from the result of a D6 roll (to a minimum of 1). Furthermore, a weapon with this special rule is assumed to have a Strength of 4 for the purposes of the No Escape rule and of determining if a hit has the Instant Death special rule.
Building an army? Create, validate and share your list with New Recruit, army builder for Warhammer 40,000 7th Edition and many more games.
Try the builder