The Hellslayer

A weapon or model with the Slayer special rule will wound on any target of the type specified by the special rule on a 2+, regardless of the model's Toughness value, if it hits them.  The target takes any saves normally.

A model attacking with this weapon Piles In and fights at Initiative step 1, unless it is a Monstrous Creature or a Walker.

A model attacking with this weapon never receives +1 Attack for fighting with two Melee weapons.

Weapons with the Master-crafted special rule allow the bearer to re-roll one failed roll To Hit per turn with that weapon.

A unit that contains at least one model with this special rule cannot Run, Turbo-boost, move Flat Out, perform Sweeping Advances or fire Overwatch. However, they can shoot with Heavy, Salvo and Ordnance weapons, counting as stationary even if they moved in the previous Movement phase. They are also allowed to charge in the same turn they fire Heavy, Ordnance, Rapid Fire or Salvo weapons.