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The Zakrim were a legendary cadre of assassins that existed within the mirror universe counterparts of the Ferengi. They were said to be skilled in the arts of camouflage, infiltration and assassination. Their capabilities of performing near invisible operations was attributed to secret technology that allowed them to avoid electronic surveillance techniques. They also practiced a Ferengi martial art called Pek. (Decipher RPG module: Through a Glass, Darkly)