Illusion (Pattern) [Darkness, Mind-Affecting]
Level: Assassin 3, Sorcerer 3, Wizard 3
Components: S
Casting Time: 1 standard action
Range: Close (25 ft. + 5 ft./2 levels)
Area: 20-ft.-radius spread
Duration: 1 round/level
Saving Throw: Will negates
Spell Resistance: Yes
A creeping pall of darkness covers the area like running ink, muting sound and color alike.
This spell reduces illumination in the area to shadowy; these shadows are mental as well as physical. All creatures in the area take a –10 penalty on Listen, Search, Sense Motive, and Spot checks. A successful Will save negates these penalties, but not the effect of the darkness.
Source: Complete Mage, page 113.