Atmospheric converter

Purpose
The Atmospheric Converter was created by Luke Rattigan and the other pupils of the Rattigan Academy for the point when they thought they would be travelling to a new world. The device functioned by emitting a blast that changes atmospheres into Oxygen.

History
It was first used by The Doctor in order to clear the Atmosphere of the ATMOS gas. It set fire to the atmosphere and dispersed the gas. The Doctor then planned to use it to ignite the Sontaran Flagship and kill the Sontarans onboard. Luke took his place and blew up the Sontarans and there flagship along with himself and he atmospheric converter.