From Pathfinder Howl of the Wild, which isn't enabled.

Songbird's Call

FOCUS 4

UNCOMMON AURA BARD COMPOSITION CONCENTRATE FOCUS

Cast

Area 15-foot emanation

Defense basic Reflex

Duration sustained up to 1 minute

Your voice calls a storm of songbirds that whirl around you and peck at your enemies. All creatures within the area of whirling birds become Concealed, and all creatures outside the area become concealed to creatures within it. A creature other than you that enters or ends its turn in the area takes 1d6 piercing damage as the birds peck at it.

Heightened (+2) The damage increases by 1d6.

Pathfinder Howl of the WildORC