Gravity cannon

Summary
Similar to the modified Fuel Rod Cannon carried by the Hunters in Halo 2.

Seen only in the level of Regret in Halo 2, only High Prophets can use this weapon. It is mounted to the front of the Prophet's throne. There are two mounted in the front. Only one can fire at a time.

It is a reddish-gold rather than the green of the Hunters' Fuel Rod Cannon, and more powerful than a Fuel Rod. The technology of a more sustained, more powerful blast is speculated to have been copied from the modifications Cortana made to the Ascendant Justice's plasma turrets in Halo: First Strike, which were made more powerful and more sustained, but drained the plasma reserves at alarming rates.

It is unknown whether the Gravity Cannon will make an appearance in Halo 3, or if it will be accessable to players. It's ammunition type is unknown, but believed to be a plasma-based weapon, and non-reloadable.