Smoke Scabbards
These charming assassination tools somehow never get officially banned by various nations or public institutions; Smoke Scabbards are simply too useful. In their natural form a Smoke Scabbard is a dirty grey-brown thin sheet of magical fabric. When it’s used to completely wrap a weapon (usually no larger than a dagger), the sheet and whatever it’s wrapped around transforms into a cohesive cloud of gas that can be inhaled and kept in a container — like, say, a pair of lungs — for eight hours. At the end of that eight hours, the Scabbard is expulsed from its container and solidifies back into a sheet and whatever it was wrapped around. If the Scabbard was being kept in somebody’s lungs, the expulsion does not cause direct damage but is highly unpleasant. Note that the magical effect can be ended early, if desired.