You summon a cloud of flammable black dust. The cloud functions as Mist. If any open flame or fire effect is within the spell's area when it's cast, or later enters or occurs within the area, the cloud ignites. Creatures in the cloud take 10d6 fire damage (basic Reflex save), and the spell ends.
Traits
An action with this trait requires a degree of mental concentration and discipline.
Effects with the fire trait deal fire damage, or either conjure or manipulate fire. Those that manipulate fire have no effect in an area without fire. Creatures with this trait consist primarily of fire or have a connection to magical fire.
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.