Rain of Rust [three-actions] Feat 4Composite Impulse Kineticist Metal Primal Water Source Rage of Elements pg. 36
You conjure a red raincloud in a 10-foot burst within 60 feet, which pours rust-colored rain directly below it. Any creature in the rain with the
metal trait, that is made of metal, or is wearing metal armor is covered in corrosive build-up. Any such creature is
clumsy 1 as long as it remains in the area. If such a creature is in the rain at the start of its turn, it takes 3d6 damage with a
basic Fortitude save against your class DC, plus 1d6
persistent damage if it fails. Damage from this impulse ignores Hardness.
Level (+2) The initial damage increases by 1d6.
Traits
Composite: A composite impulse combines multiple elements. You can gain an impulse with the composite trait only if your kinetic elements include all the elements listed in the impulse's traits.
Impulse: The primary magical actions kineticists use are called impulses. You can use an impulse only if your kinetic aura is active and channeling that element, and only if you have a hand free to shape the elemental flow. The impulse trait means the action has the concentrate trait unless another ability changes this. If an impulse allows you to choose an element, you can choose any element you're channeling, and the impulse gains that element's trait.
Metal: 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 planes consist of chaotic and shifting structures and oceans of metal. Metal planes tend to exist in a state of change and decay, leaving plentiful pockets of air for visitors to breathe or move within. Creatures unlucky enough to be entombed in the plane’s substance risk suffocation if they can’t phase through metal. Wood creatures find the lack of stability and soil on a metal plane disconcerting and often fail to thrive in such environments.
Primal: This magic comes from the primal tradition, connecting to the natural world and instinct. Anything with this trait is magical.
Water: Effects with the water trait either manipulate or conjure water. Those that manipulate water have no effect in an area without water. Creatures with this trait consist primarily of water or have a magical connection to the element. Planes with this trait are mostly liquid, perhaps with pockets of breathable air.