Chemical weapon

A chemical weapon is an device which deploys deadly chemicals to a target. A common chemical weapon used in ancient Earth wars was mustard gas.

The designs for the chemical weapons were present in the databanks on the USS Verdun. In 2163 Commodore Lucian Murat had downloaded the designs that were used by the Human forces on Torgu-Va to make this weapon in their fight against the Tarn. Both Tarn and Human forces used mortars and airplanes to deliver the chemical weapons. 

Sometime prior to 2376 on an unknown planet, the Cataclysm was fought with nuclear, biological and chemical weapons.