Directed-energy weapon

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A Directed Energy Weapon (or DEW) is a type of weapon that delivers a non-solid projectile with a high enthalpy (kinetic and thermal). It transfers energy to a target for a desired effect. Some of these weapons are real or in development; others are at present only science fiction.

Lasers

Main article: Laser

File:M6 Spartan Laser.jpg

The UNSC's only infantry laser weapon, the Spartan Laser or Galilean

Lasers are used for a wide array of functions, ranging from repair equipment to weaponry. Pulse Lasers are standard armament on Covenant warships and, unusually, to UNSC Prowlers, and are used for precision strikes against small targets, intercepting incoming missiles and fighters, and general point-defence. Other lasers are used to repair equipment by both the Covenant and UNSC, while the only infantry-portable laser weapon is used by the UNSC, the Galilean or "Spartan Laser". The Spartan Laser was the only Laser mention throughout the games.

Plasma

Main article: Plasma Torpedo

One of the most commonly used Directed Energy Weapons, the Plasma Rifle

The Covenant's most common weapon type, however, is superheated plasma that is contained within a controlled magnetic field, able to be guided to a target and dealing heavy damage. Ship-mounted plasma weapons can launch torpedoes, capable of tracking their targets with precision, making them devastating in ship-to-ship combat, or can fire very large streams of plasma from afar to glass a planet's surface from orbit. Vehicle-mounted plasma weapons usually have a high rate of fire, but lack the guidance systems. Infantry weapons commonly use guided plasma, such as the Plasma Rifle, Plasma Pistol, and the Plasma Grenade.

Particle Beam Weapons

Main article: Particle Beam Weapon

A Particle Beam Rifle.

The Covenant also use accelerated particles as weaponry, such as the devastating capitol-ship mounted Energy Projector and the infantry Type-50 Sniper Rifle System. These weapons use charged or neutral particles, and may appear similar to lasers though the differences are extensive. Though humans have an understanding of accelerated particle technology they have not yet used it for weaponry.

As of the early 21^st century, humanity had developed particle accelerators, but the machinery needed to work one is massive. At this time, humans also did not understand how particles at such speeds interacted with other matter.