Plasma beam

The Plasma Beam is a powerful Covenant vehicle mounted weapon used by Locusts. Scarabs are also equipped with a similar but much more powerful weapon.

Description
This powerful weapon was originally designed to be a mining tool, but, as the Great War escalated, the Covenant decided to use it for military purposes. The Locust fires it only when stationary, possibly because of the power it requires; to increase its power, the Locust crew can divert the shield's energy to the weapon, draining them but drastically increasing the beam damage.