I had an idea for battlefield control that was like a sort of baby [i]wall of fire[/i].
Level:[/b] Sor/Wiz 2
[b]Components:[/b] V, S, M
[b]Casting Time:[/b] 1 standard action
[b]Effect:[/b] 20 ft. sheet of flame
[b]Duration:[/b] 1 round/level
[b]Saving Throw:[/b] None
[b]Spell Resistance:[/b] Yes
Upon casting, choose any contiguous area up to 20 feet in length. An immobile sheet of flame five feet high sprouts into being where you indicate. Creatures occupying or passing through this area take 2d4 points of fire damage +1 point of fire damage per caster level (maximum +20) and risk catching on fire.
If you evoke [i]lingering flame[/i] so that it appears where creatures are, each creature takes damage as if passing through the area. If any 5-foot length of area takes 20 points of cold damage or more in 1 round, the effect of [i]lingering flame[/i] ends. (Do not divide cold damage by 4, as normal for objects.)
[i]Lingering flame[/i] can be made permanent with a [i]permanency[/i] spell. A permanent [i]lingering flame[/i] that is extinguished by cold damage becomes inactive for 10 minutes, then reforms at normal strength.
[i]Arcane Material Component[/i]
A pinch of ash mixed with soft wax, quickly shaped as you wish the flame to be shaped.