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Snake's retreat
rogue attack 19

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

Target: one creature

Attack: Dexterity vs. AC

Hit: "6[W] + Dexterity modifier damage."

Effect: When the target makes a melee attack or a ranged attack against you, you can shift 1 square as an immediate interrupt. The target can make a saving throw to end this effect.[PH:124]

Snake's retreat is a daily power available to rogues at 19th level.