Omnethoth

The Omnethoth was a sentient weapons system designed by a race called the Masters, who created it with universal domination in mind.

History
The Omnethoth eventually destroyed the Masters and then found its way to the Minerva system, where it totally destroyed Yquatine. The Doctor reprogrammed the Omenthoth to make them tame and harmless, after which President Vargeld of Yquatine had them destroyed. (EDA: The Fall of Yquatine)