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Pin the foe
warlord attack 1

Target: one creature

Attack: Strength vs. AC

Hit: "3[W] + Strength modifier damage."

Effect: "Until the end of the encounter, the target cannot shift if at least two of your allies (or you and one ally) are adjacent to it."[PH:146][Dr397:18]

Pin the foe is a daily power available to warlords at 1st level.