Type-52 plasma launcher
From Halopedia, the Halo wiki
The Type-52 Guided Munitions Launcher/Explosive (T52 GML/E), more commonly known as the Plasma Launcher, is a plasma-based explosive launcher used by the Covenant before and during the Human-Covenant War.
This shoulder-mounted weapon is capable of launching up to four large explosive plasma grenade-like bolts at a single target. How many shots are fired depends on the charging time. The wielder may release the trigger at any time to fire the charged shots, and the weapon will automatically fire after 4 bolts have been ready for 3 seconds. The bolts track vehicles and bipeds similarly to the Needler, although slightly differently- a red circle will appear around a target to indicate the Launcher is "locked on". The Plasma Launcher has a 2.5× zoom capability, which enables the user to lock onto targets from farther away. The bolts will continue to track until they hit the target or another object, regardless of the death of the operator, being redirected by physical impulses or the target teleporting across vast distances. The bolts stick to the target on impact, like plasma grenades. The detonation time is dependent on the amount of bolts stuck to the target, which means that single shots often give kills from the grave. The bolts have an arcing trajectory when fired untracked over long distances. It has an appearance slightly similar to the Fuel Rod Gun, as they are both Covenant heavy weapons, though the Launcher is blue and the Fuel Rod Gun is brown/gold. The Plasma Launcher is carried in combat by high-ranking Grunts, Elites, and Brutes.
List of appearances