Cyber-bomb

Cyber-bombs were explosives used by the Cybermen. They were capable of extreme destruction on a planetary scale. The Cybermen developed and used cyber-bombs before, possibly during, and after the Cyber-Wars that were started in 2526. (DW: Revenge of the Cybermen, Earthshock) Because of their destructive property, they were outlawed by the Armageddon Convention despite the Cybermen not attending the conference. (MA: The Empire of Glass)

Different bombs that were developed were capable of destroying a planet and others were supposedly capable of destroying a TARDIS. CyberNeomorphs planned to destroy Earth in 2526 to prevent the Cyber-Wars. The Doctor described this cyber-bomb as being powerful enough to make life difficult for the people who survived the blast. (DW: Earthshock)

Other Neomorphs were Time Scooped to the Death Zone on Gallifrey and attempted to use several cyber-bombs to destroy the Doctor's TARDIS. (DW: The Five Doctors)

Sometime around the 29th century, a ship of CyberNomads attempted to destroy the Planet of Gold, Voga. The Cyber-Leader stated that only two bombs were needed to "fragmentize" the planet. (DW: Revenge of the Cybermen)