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Defender's cohort
rogue attack 3

Requirement: wielding a light blade

Target: one creature

Attack: Dexterity vs. AC

Hit: "2[W] + Dexterity modifier damage. If the target is marked by an ally of yours, the attack deals extra damage equal to your Charisma modifier."[MP:75]

Defender's cohort is an encounter power available to rogues at 3rd level.

Defender's cohort is a rattling power, so if the user is trained in Intimidate, and the target is damaged by the power and not immune to fear, the target takes a −2 penalty to attack rolls until the end of the user's next turn.