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Myrmidon formation
warlord attack 1

Requirement: using a shield

Target: one creature

Attack: Strength vs. AC

Hit: "2[W] + Strength modifier damage."

Effect: "At the start of your next turn, each ally adjacent to you gains 5 temporary hit points."[MP:103]

Myrmidon formation is an encounter power available to warlords at 1st level.