Skyhammer

Sontaran Skyhammers were massive energy cannons capable of taking out large ships. The Tenth Doctor remarked that he hadn't seen one in years when UNIT used a skyhammer to take out the Skith's crystal ship. (COMIC: The Age of Ice)

The Sontaran Subliminal Education Matrix mentioned the Skyhammer to Strax. (PROSE: A Soldier's Education)