Anubis' superweapon

Anubis's superweapon was a planet destroying weapon that Anubis installed in his supermothership. Located at the top of the mothership, the ship fired an energy beam at the Stargate of the planet in question. The Stargate would then explode, wiping out all life on the planet. The weapon could only be powered by the Eyes of the Goa'uld, though attempts to adapt naquadria were unsuccessful. The superweapon was destroyed when the Goa'uld fleet under the control of the System Lord Ba'al destroyed the mothership when it was at Langara. Anubis later built a second mothership, but it is unknown if it also carried a superweapon.