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From Pathfinder Adventure: Prey for Death, which isn't enabled.

Crimson Bluff

ITEM 15
RAREAGILEFINESSEILLUSIONMAGICALTWIN
Price 6500 gp
Usage held in 1 hand
Bulk L
Category advanced
Group sword
Damage 1d6 slashing

This +2 greater striking grievous sawtooth saber has a red hilt and a purple-black blade. Favored by Red Mantis assassins who enjoy using illusions to confound their targets, a crimson bluff constantly flickers and flashes, creating brief afterimages that can be quite distracting. If you use a crimson bluff as part of a gesture when you Create a Diversion, you gain a +2 item bonus to your Deception check.

Activate—Shimmer Step (concentrate, manipulate)
Frequency once per day
Effect You cast Blur and then you Step or Stride.
Activate—Swap Places (concentrate)
Frequency once per day
Requirements You are under the effects of blur
Trigger An enemy would hit you with a melee Strike
Effect You swiftly dodge to the side as a momentary image of yourself manifests to distract the foe. The triggering Strike uses the outcome for one degree of success worse than the result of the attack roll. The duration of your blur effect is reduced by 2 rounds.
Pathfinder Adventure: Prey for DeathORC