The Eclipse Cannon

An invention of Gerald Robotnik's, situated on the underside of the Space Colony ARK. With the help of Shadow the Hedgehog and Rouge the Bat, Dr Eggman gathered the Chaos Emeralds to generate enough power to run it. Eggman poignantly demonstrated the Eclipse Cannon's power by blowing up half of the moon.
Shadow later used the cannon to destroy the Black Comet of the Black Arms Aliens.