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Craven's bane
rogue attack 27

Requirement: wielding a light blade.

Target: one creature

Attack: Dexterity vs. AC

Hit: "3[W] + Dexterity modifier damage. If this attack bloodies the target, it moves its speed away from you, taking the safest path possible."
Ruthless Ruffian: The target grants combat advantage until the end of your next turn.[MP2:70]

Craven's bane is an encounter power available to rogues at 27th level.

It is rated as a poor choice with the major benefit being hard to setup due to the attack needing to bloody the target, and being an underwhelming option otherwise.[Charop Rogue]