Photonic missile

Photonic missiles were Sontaran heavy weapons.

History
The Fourth Doctor feared the Sontarans would barrage Earth with photonic missiles in response to an incursion by the Rutan Host circa 1900. (TV: Horror of Fang Rock)

In 2371 at the Battle of Antares, a Sontaran Linx class cruiser destroyed a Rutan assault cruiser with a single photonic missile after the Rutan vessel lost shields. This indicates that the weapon could be configured to an anti-ship role in addition to surface bombardment. (PROSE: Lords of the Storm)