Parasitic purple hands, attaching themselves to victims with its spike. The left-hand "sinistral" noble class rule whichever secret handlinger community they are a part of, as they have the ability to shut down the dextrier's control over its host at will. These right-hand "dextrier" warriors, however, are perhaps more terrifying for a non handlinger, as they are able to fly and spit fire using the body of whichever host they choose.
Though feared by the citizens of New Crobuzon, handlingers have long been in contact with the city's rulers, and (between the events of The Scar and Iron Council) even agreed to have their presence in the city made public knowledge (along with the assertion that only the criminal condemned would be used as hosts). This development puts yet another terrifying weapon in the hands of the New Crobuzon government, but due to internal politics, handlingers were found on both sides of the Collective's failed revolution.