If a model with this special rule rolls a natural 6 when making a roll To Wound for an attack made in combat, it has struck a 'Cleaving Blow'. Enemy models whose troop type is regular infantry, heavy infantry, light cavalry, heavy cavalry or war beasts are not permitted an armour or Regeneration save against a Cleaving Blow (Ward saves can be attempted as normal).

Note that if an attack wounds automatically, this special rule cannot be used.