Ion cannon

The Ion Cannon was a Confederate weapon used to defend their capital world, Tarsonis. It was deactivated before the Sons of Korhal conquered Tarsonis, but after Arcturus Mengsk betrayed Jim Raynor and the player's character and formed the Terran Dominion, the weapon was reactivated to prevent Raynor from leaving Tarsonis. Unfortunately for Mengsk, Raynor and the player were able to destroy the Ion Cannon, and soon escaped Tarsonis.