A Skullcracker is a hissing and grinding arcane-mechanical conglomeration of iron hammers, hacking blades and brutal picks designed to pulverise and shred anything unfortunate enough to be caught in front of the machine.
An Iron Daemon equipped with a Skullcracker replaces the Impact Hits (D6+1) special rule with the Impact Hits (2D6+2) special rule and gains the Armour Bane (1) special rule.