As the Plague Furnace crashes into the enemy ranks, the rusty chains holding the great censer are loosed with devastating effect.
Stomp Attacks made by a Plague Furnace represent the Great Censer being let loose to swing into the enemy with devastating effect. Any Stomp Attacks made by a Plague Furnace have an Armour Piercing characteristic of -2.
In addition, whilst within 3" of one or more models with this special rule, the noxious fumes billowing from the Great Censer cause enemy units to suffer a -1 modifier to their Toughness characteristic (to a minimum of 1).