Mark 2488 Magnetic Accelerator Cannon

The Onager is a 15 centimeter mass driver cannon capable of delivering a MAC round of up to 1.1 gigajoule of kinetic energy. It was one of many weapon installations present on the planet Reach.

Operational history
During the Battle of Reach, Emile-A239 manned a mass driver to disable a Covenant cruiser from assaulting the. However, the SPARTAN-III was killed by several Sangheili warriors, prompting SPARTAN-B312 to commandeer the cannon and delay the Covenant assault.

List of appearances

 * Halo: Reach