Retch Rust

You exhale tendrils formed from flakes of rusted metal. All creatures in a @Template[cone|distance:30] take (floor((@actor.level -8)/2)+4)d10[slashing|options:area-damage] damage with a fortitude|against:kineticist|basic|options:area-effect save against your class DC. A metal creature that fails its save also takes (floor((@actor.level -8)/2)+2)d4[persistent,slashing] damage. Level (+2) The cloud's slashing damage increases by 1d10 and the persistent damage increases by 1d4.