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Clever strike
rogue attack 1

Requirement: wielding a light blade

Special: If an ally is adjacent to and able to attack the target, the user has combat advantage against the target for this attack.

Target: one creature

Attack: Dexterity vs. AC

Hit: "1[W] + Dexterity modifier damage.
"Level 21: 2[W] + Dexterity modifier damage."[PHH2:MH3]

Clever strike is an at-will power available to rogues at 1st level.