Both a sophisticated and ultimately disposable piece of spycraft, and the name of the profession of the people who use them.
A class of cybernetic prosthetics worn over the face
A strange mask containing a merciless demon, a parasite on those around it.
Serpens Necto is a mask made of snake skins stitched together and crudely painted in white. With this on a person can bind people to their will under the right conditions. In darkness the effect of the mask is greatly enchanced by illumination from under by a candle.