You pepper your foe with arrows.

Encounter   ✦     Martial, Weapon
Standard Action      Ranged weapon

Target: One creature

Attack: Dexterity vs. AC, three attacks

Hit: 1[W] + Dexterity modifier damage per attack. If two attacks hit, deal an extra 1[W] damage. If all three attacks hit, deal an extra 2[W] damage.

Published in Player's Handbook, page(s) 112.