Sonic cannon droids were mass produced during the Clone Wars by the Kegan research facility. Most of them were used in the Grigonian military because of the small amount of Grigonian soldiers due to the Grigonian hatred of violence. They were heavily armed with a single HY-6 heavy cannon on the "nose" and two shoulder mounted sonic cannons. They were purple in coloration, had two walker like legs, helmet like head with two red sensors and the aforementioned blaster cannon, rounded shoulders with two sonic cannon attached and two long humanoid arms and hands.