D&D4 Wiki
Flickering Blades
Ranger Attack 23

You whirl your weapon in a dazzling butterfly pattern. The flash of steel momentarily disorients any enemy you strike.

Melee weapon

Target: One, two, or three creatures

Attack: Dexterity vs. AC

Hit: 3[W] + Dexterity modifier damage, and the target takes a -2 penalty to attack rolls until the end of your next turn.

Flickering Blades is an encounter power available to rangers at the 23rd level.[MP2:43]