The Widowmaker is a promotional primary weapon for the Engineer. It is a futuristic, tan Shotgun styled after the Widowmaker TX, a weapon available in Deus Ex: Human Revolution.

This weapon uses the Engineer's metal as its source of ammunition; each shot fired will consume 60 metal, making for a maximum of 3 shots able to be fired without additional metal, with no requirement to reload. Each point of damage done to an enemy player or building with the Widowmaker is returned to the Engineer as metal.

It was awarded in Genuine quality to players who pre-purchased Deus Ex: Human Revolution on Steam before August 26, 2011.