Your body transforms entirely into flexible iron. You gain resistance 10 to physical damage, except adamantine. You're immune to death effects, disease, drained, Fatigued, healing, nonlethal attacks, Paralyzed, poison, sickened, vitality, and void; any of those conditions you had when the spell is cast are suspended until the spell ends, then return with their remaining duration when the spell ends. While made of iron, you're subject to rusting effects like the Rust Cloud spell.
Your fist Strikes have a 1d10 damage die, and your metal spells deal one additional die of damage (of the same damage die and damage type the spell uses). You can cast Needle Darts as an innate spell; the casting is reduced from 2 actions to 1.
In this form, you don't need to breathe. Your Bulk doubles (to 6 if you're Small or 12 if you're Medium), and you become too dense to Swim in water, automatically sinking to the bottom. You can Dismiss the spell.
Spell Effect: Ferrous Form
Heightened (9th) The resistance increases to 15.
Traits
An action with this trait requires a degree of mental concentration and discipline.
You must physically manipulate an item or make gestures to use an action with this trait. Creatures without a suitable appendage can't perform actions with this trait. Manipulate actions often trigger reactions.
Effects with the metal trait conjure or manipulate metal. Those that manipulate metal have no effect in an area without metal. Creatures with this trait consist primarily of metal or have a connection to magical metal.
These effects completely transform the target into a new form. A target can't be under the effect of more than one polymorph at a time. If it comes under the effect of another, the second effect attempts to counteract the first. If it succeeds, it takes effect, and if it fails, the spell has no effect on that target. Any Strikes granted by a polymorph effect are magical. Unless otherwise stated, polymorph spells don't allow the target to take on the appearance of a specific individual creature. If you take on a battle form with a polymorph spell, the special statistics can be adjusted only by circumstance bonuses, status bonuses, and penalties. Unless otherwise noted, the battle form prevents you from casting spells, speaking, and using most manipulate actions that require hands. (If there's doubt about whether you can use an action, the GM decides.) Your gear is absorbed into you; the constant abilities of your gear still function, but you can't activate any items. You lose your Speeds and gain those of the battle form. If a polymorph effect causes you to increase in size, you must have space to expand into or the effect is disrupted.