Glittergun

The Glittergun was a weapon developed by the enemies of the Cybermen during the Cyber-Wars once their vulnerability to gold had been discovered by the humans and other allies of the Vogans.

The weapon fired gold dust particles or even sometimes molten gold into the chest units of the Cyberman, plugging up their respiration system and suffocating them. The Vogans supplied the gold thanks to the gold supplies abundant on Voga. In retaliation, the Cybermen tried to destroy Voga, but they failed. They later tried to destroy what was left of the planet, but they did not succeed. (TV: Revenge of the Cybermen)

Tobias Vaughn personally designed and funded the development of the glitterguns. (PROSE: Original Sin)