By singing out a precise tone, you cause discordant vibrations to run through allies’ weapons.
Benefit: Whenever you are using bardic performance to create a spell-like or supernatural effect, allies within 30 feet of you deal an extra 1d6 points of sonic damage with successful weapon attacks. This damage stacks with other energy damage a weapon might deal. Projectile weapons bestow this extra damage on their ammunition, but the extra damage is dealt only if the projectile hits a target within 30 feet of you.
Pathfinder Roleplaying Game Ultimate Combat. © 2011, Paizo Publishing, LLC; Authors: Jason Bulmahn, Tim Hitchcock, Colin McComb, Rob McCreary, Jason Nelson, Stephen Radney-MacFarland, Sean K Reynolds, Owen K.C. Stephens, and Russ Taylor.