Wall of Perilous Flame
Spell Information
Spell level : Innate level: 5, Warlock: Greater
Components : None
Range : Medium
Target/Area : Wall 20 ft long
Duration : 3 rounds
Save : None
Spell resistance : Yes

You conjure a curtain of fire that deals 2d6 points plus the warlock's Charisma modifier of fire and magic damage to any creature that attempts to pass through it. Half the wall's fire damage results from supernatural power and is therefore not subject to being reduced by resistance to fire. The curtain of flame lasts for 3 rounds before dissipating.

This is one of the few warlock abilities that properly respects the caster's full spellcasting level when rolling against spell resistance. This invocation also actually grants a reflex save, though a successful save doesn't seem to have any appreciable effect (Evasion/Improved Evasion are ignored). Finally this invocation deals its stated damage once at the end of every round plus any time the target/s try to move into the area of effect, for a total of four damage instances per cast versus a stationary target.