Battlefield Archer Attack 11Combined Fire
You combine fire with one of your allies to take down a troublesome foe.
Encounter Martial, Weapon
Immediate Reaction Ranged weapon
Trigger: An ally makes a ranged attack or an area attack
Target: One creature attacked by your ally
Attack: Dexterity vs. AC
Hit: 3[W] + Dexterity modifier damage.
Published in Player's Handbook, page(s) 114.