Evocation (Force)
Creates a burst of concussive force that stuns victims without causing any permanent damage, dealing 1d4 points of non-lethal damage per caster level (maximum 10d4) to every creature within the area and stunning them for 1 round.
Range: Close (25 ft. + 5 ft./2 levels)
Sor 3, Wiz 3

From: Dragon #344