Thundering Drums

Evocation [sonic]
Level: Bard * 3
Components: V, S
Casting Time: 1 Standard Action
Range: 15 ft.
Area: cone-shaped burst
Duration: instantaneous
Saving Throw: Fortitude partial
Spell Resistance: yes
  You strike the ground in front of you, filling the area in front of you with the thunder of pounding drums. Any creature in the area takes 1d8 points of sonic damage per Caster Level (maximum 5d8) and is knocked Prone. A successful Fortitude Save halves the damage and negates being knocked Prone.