Shred If a model has the Shred special rule, or is attacking with a Melee weapon that has the Shred special rule, it re-rolls failed To Wound rolls in close combat.
Similarly, if a model makes a shooting attack with a weapon that has the Shred special rule, it re-rolls its failed To Wound rolls.
Smash All of the close combat attacks, except Hammer of Wrath attacks, of a model with this special rule are resolved at AP2 (unless it's attacking with an AP1 weapon). Additionally, when it makes its close combat attacks, it can choose instead to make a single Smash Attack. If it does so, roll To Hit as normal, but resolve the Attack at double the model's Strength (to a maximum of 10). Furthermore, a model making a Smash Attack can re-roll its armour penetration rolls, but must abide by the second result.