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Marked beating
rogue attack 19

Requirement: wielding a crossbow, a light blade, or a sling.

Target: one creature marked by an ally

Attack: Dexterity vs. Reflex

Hit: "5[W] + Dexterity modifier damage, and the target is dazed and takes a −2 penalty to all defenses (save ends both)."

Miss: "Half damage, the target is dazed until the end of your next turn, and no penalty to defenses."[MP:83]

Marked beating is a daily power available to rogues at 19th level.