This mighty golem made of polished iron resembles a keen-eyed dwarf. It carries a warhammer and a large shield bearing a holy symbol.
Str 32, Dex 9, Con —, Int 15, Wis 14, Cha 13
As a standard action, the Grand Defender can shed its outer layer of metal, revealing a slightly smaller version of itself underneath. This new form may be made of cold iron (changing its DR to 15/cold iron), mithral (DR 15/silver), or iron (DR 15/adamantine, as normal). Its attacks count as this metal type for overcoming damage reduction. If the herald is brought to 0 hit points, it becomes inert; 1d4 hours after it last took damage, it sheds its outer layer and reanimates at half its normal hit points.
Once shed, the outer layer decays into worthless powder over 1d4 minutes.
The herald's poisonous breath weapon functions like that of an iron golem (free action every 1d4 rounds, 10 ft. cube, Fort DC 19, 1d4 Con, 2 consecutive saves). The save DC is Constitution-based. The cloud persists for 1 round.
The herald's shield is a +3 heavy steel shield, though it becomes non-magical if the herald is destroyed or is no longer holding or wearing it.
The herald can expel a volley of warhammers from its mouth, which functions like a breath weapon (30-foot cone, 15d6 bludgeoning damage plus Awesome Blow, Reflex 19 half, usable 1/day). If the herald is in its cold iron or mithral form, these hammers count as cold iron or silver, respectively. The herald can exclude any number of squares in the cone. The hammer storm creates 24 physical warhammers that persist after the instantaneous attack and may be used by creatures (though they're normal warhammers, not masterwork, cold iron, or mithral). The herald can spend 1 minute eating 24 warhammers (or an equivalent amount of metal such as that created by its ablative adaptation ability) to recharge this ability. The save DC is Constitution-based.