Flashfire

Evocation [fire]
Level: Druid * 3, Hunter * 3, Shaman * 3
Components: V, S
Casting Time: 1 Standard Action
Range: medium (100 ft. + 10 ft./level)
Area: one 5-ft. square/2 levels
Duration: 1 round/level
Saving Throw: Reflex negates (object) and Fortitude negates
Spell Resistance: yes (object)
  You cause flames to spring up in the area of effect. These flames deal 1d6 points of fire damage for every 3 Caster Levels you have (maximum 5d6) to each creature that enters a burning area or begins its turn in the area; these creatures also Catch On Fire. A creature that succeeds at a Reflex Save negates the damage and avoids Catching On Fire. The area and all adjacent 5-foot squares are smoky, providing concealment within. You can concentrate as a Standard Action to ignite one 5-foot square adjacent to a currently burning square. Heavy precipitation (including sleet storm) ends the spell. Strong and severe winds spread each square of flashfire downwind by one square each round, but windstorm-force or stronger winds extinguish the fires.