Stargate destroyer

A Stargate destroyer is a device used by the Ancients to destroy a Stargate from another planet.

Overview
The weapon worked by sending a stream of energy through an outgoing wormhole, the device was capable of storing energy in the gates capacitors. However, if too much is stored, the gate was capable of exploding in a blast resulting in two to three thousand megatons, enough to wipe out all life on a planet the size of Earth.

The destroyer weapon was a large structure located on a planet which contained a ring of smaller obelisks with a central structure firing the energy beam into the Stargate. The edges of the structure are shielded by the obelisks preventing entry through the open areas, however, there was an doorway allowing individuals to pass through unimpeded.

History
Anubis managed to locate one such device, and used it in an attempt to destroy the Tau'ri. Earth was powerless in stopping the weapon as the short wormhole window did not apply as massive quantities of energy was being channeled into the gate to keep it opened and attempts to redirect the weapon back at its source with an EMP generator failed as well.

Anubis's plan succeeded in destroying the Stargate but this only worked on the Beta Gate which exploded in orbit of Earth after Jack O'Neill was able to fly it away from Earth in the X-302. Worse for Anubis, Rya'c, piloting a stolen death glider, was able to destroy the device.