Wrought by Vulkan Bray'arth Ashmantle's Dreadnought chassis, the 'Iron Dragon' is a unique relic immune to the particular effects of the Melta, Rending, Armourbane, and Lance special rules. Any other rules which either reduce his Armour Value or allow attacks which target him to roll more than one dice when making an Armour Penetration check have no effect against the Dreadnought.
Burning Wrath Bray'arth Ashmantle may forfeit one of his usual close combat attacks in order to inflict one automatic S5 AP4 hit on every model (friend and foe) in base contact with him at Initiative step one. The rest of his attacks are made as normal. Note that this is not the effect of a single weapon and so is not affected by Weapon Destroyed results.
Chapter Tactics When choosing an army, all models in the same Detachment or Formation must be drawn from the same Chapter. If a unit's datasheet contains a Chapter in brackets after the Chapter Tactics special rule - for example, "Chapter Tactics (Ultramarines)" - the unit must always be drawn from this Chapter, and therefore cannot be included in a Detachment or Formation with any units that are drawn from other Chapters. All models drawn from a given Chapter benefit from that Chapter's Special Rule. If a unit contains models drawn from two different Chapters, it counts as from neither Chapter, and thus benefits from neither Chapter Tactic.
Venerable If a Venerable Dreadnought suffers a penetrating hit, you can make your opponent re-roll the result on the Vehicle Damage table. You must accept the second result, even if it is worse than the first.