Harbinger Blade

When rolling To Wound for a model that has the Immaterial Blades (X) special rule, or is attacking with a weapon that has the Immaterial Blades (X) special rule, for each To Wound roll or Armour Penetration roll of 6 or higher, the controlling player resolves these Wounds or any Penetrating Hits at the AP value listed in brackets, instead of the weapon’s normal AP value.

Attacks with this special rule cause Instant Death on a To Wound roll equal to the number in brackets associated with the specific rule. Roll any viable Saves against this Instant Death-causing Wound separately and before any other Wounds the attack inflicts.