Your precisely timed shots disrupt your foe's concentration, buying time for an ally to act.
Daily ✦ martial, weapon
Ranged Weapon
Target: One Creature
Attack: STR vs AC
Hit: 2[W] + Strength modifier damage.
Effect: Until the end of the encounter, whenever you hit the target with a ranged attack, one ally adjacent to it can either make a melee basic attack against it as a free action or shift a number of squares equal to your Intelligence or Wisdom modifier as a free action.
Create Opportunity is a daily attack power available to warlords at level 5.
Create Opportunity was first introduced in Martial Power 2.
CharOp Evaluation: Great [Char-op Warlord]
This will likely significantly increase your ally's damage, while dealing solid damage by itself.