Greater Invocation; 5th
You can conjure a wall of fire as the spell with this invocation. Half the wall’s fire damage results from supernatural power and is therefore not subject to being reduced by resistance to fire. If a creature is reduced to 0 hit points or lower by a wall of perilous flame, its remains are completely consumed 1 round later (as if by a destruction spell).
Source: Complete Arcane
Level: Drd 5, Fire 4, Sor/Wiz 4
Components: V, S, M/DF
Casting Time: 1 standard action
Range: Medium (100 ft. + 10 ft./level)
Effect: Opaque sheet of flame up to 20 ft. long/level or a ring of fire with a radius of up to 5 ft. per two levels; either form 20 ft. high
Duration: Concentration + 1 round/level
Saving Throw: None
Spell Resistance: Yes
An immobile, blazing curtain of shimmering violet fire springs into existence. One side of the wall, selected by you, sends forth waves of heat, dealing 2d4 points of fire damage to creatures within 10 feet and 1d4 points of fire damage to those past 10 feet but within 20 feet. The wall deals this damage when it appears and on your turn each round to all creatures in the area. In addition, the wall deals 2d6 points of fire damage +1 point of fire damage per caster level (maximum +20) to any creature passing through it. The wall deals double damage to undead creatures.
If you evoke the wall so that it appears where creatures are, each creature takes damage as if passing through the wall. If any 5-foot length of wall takes 20 points of cold damage or more in 1 round, that length goes out. (Do not divide cold damage by 4, as normal for objects.)
Wall of fire can be made permanent with a permanency spell. A permanent wall of fire that is extinguished by cold damage becomes inactive for 10 minutes, then reforms at normal strength.
Arcane Material Component: A small piece of phosphorus.
Source: Player's Handbook