No Light

Transmutation [Darkness]
Level: Brd 1, Clr 0, Sor/Wiz 0
Components: V, S
Casting Time: 1 action
Range: Close (25 ft. + 5 ft./2 levels)
Area: 20-ft.-radius spread
Duration: 1 minute/level
Saving Throw: None
Spell Resistance: No

The caster creates an area of darkness. Normal light sources cannot illuminate the area, but darkvision allows a creature to see within the area. Light counters no light (and vice versa), leaving whatever light conditions normally prevail in the overlapping areas of the spells. Higher level light spells counter and dispel no light.

(Book of Vile Darkness, p100)