Charred Remains Feat 9
Source Pathfinder Lost Omens: Ancestry Guide
Frequency once per day
Your next fire spell leaves embers in its wake. If your next action is to Cast a Spell with an area and the fire trait, for 1 minute, your spell's area becomes difficult terrain as well as hazardous terrain, dealing 1 fire damage for each square a creature moves through.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
FireEffects 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 magical connection to that element.
IfritA type of geniekin descended from a being from the Plane of Fire.
MetamagicActions with the metamagic trait, usually from metamagic feats, tweak the properties of your spells. You must use a metamagic action directly before Casting the Spell you want to alter. If you use any action (including free actions and reactions) other than Cast a Spell directly after, you waste the benefits of the metamagic action. Any additional effects added by a metamagic action are part of the spell's effect, not of the metamagic action itself.