Cone of Dimness(Spell Compendium, p. 50)
Illusion (Phantasm) [Mind-Affecting]
Level: Sorcerer 3, Wizard 3, Spellthief 3,
Components: V, S,
Casting Time: 1 standard action
Range: 60 ft.
Area: Cone-shaped burst
Duration: 1 round/level
Saving Throw: Will negates; see text
Spell Resistance: Yes
Splaying your fingers, you call upon the energies that dwell within the shadowy places of the world. Your arm shakes with barely contained power, causing a translucent gray cone to burst forth from your outstretched hand.
Creatures in the cone must succeed on a Will save or believe darkness has engulfed them, rendering them blinded. A creature that makes its initial Will save suffers no ill effects. A creature that fails its initial save can attempt a new saving throw each round until it succeeds or the spell expires. Failing the subsequent saving throws results in continued blindness. Success on a later save means the creature feels its vision beginning to clear, although its vision remains dim and hazy for the remainder of the spell. This results in a 20% miss chance for any attack the creature makes.