Wall of Silence
Evocation  [Sonic]  {Aerea}
Level: Brd 4, Clr 4, Sor/Wiz 4
Components: V, S
Casting Time: 1 action
Range: Medium (100 ft. + 10 ft./level)
Target/Area/Effect: Wall whose area is up to one 10 ft. square/level or a sphere or hemisphere with a radius of up to 1ft./level
Duration: 1 minute/level (D)
Saving Throw: See text
Spell Resistance: Yes
Creates an invisible barrier to sound and sonic effects. The wall of silence cannot move and it is immune to damage of all kinds. Sonic effects and sound cannot pass through the wall in either direction. Creatures passing through the wall must make a Fortitude save or become deafened as though they had been the subject of a deafness spell. Creatures within the area of effect at the time of the spells casting must make a Fortitude save or be likewise affected.
    The caster can form the wall into a single flat plane whose area is up to one 10-foot square per level, or into a sphere or hemisphere with a radius of 1 foot per level. If the barrier is shaped as a sphere or hemisphere then creatures without cannot hear any sound that is vocalized or created from within the area of effect.