Grapnel gun

Note: this device has not been named in the comic; the closest direct reference is when Sturvin says,

First seen employed by the Baron in Volume I to operate a control arm on the Search Engine before getting close enough to reprogram it, a grapnel gun is a device the size and shape of a pistol that is capable of launching a grappling iron and line, and retracting it. Veilchen uses one in Volume VI to escape the oubliette, and Violetta uses one in Volume VIII to escape, with Agatha, a fun-sized mobile agony and death dispenser. These latter two uses (along with a number of other similarities) leads to the speculation that both are Smoke Knights, with the gun being standard-issue. However, given that the Baron had one, and Sturvin seemed to think he could get one, they are obviously not unique to the Smoke Knights.