Directed-energy weapon

There is more information available on this subject at Directed-energy weapon on the English Wikipedia.

A directed-energy weapon (DEW) is a type of weapon that uses a non-solid projectile with a high enthalpy (kinetic and thermal energy) rather than solid ballistic ammunition. It transfers energy to a target for the desired effect.

Lasers

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

Main article: Laser

Lasers are used for a wide array of functions, ranging from repair equipment to weaponry. Pulse laser turrets are standard armament on Covenant warships and, unusually, UNSC Prowlers, and are used for precision strikes against small targets, intercepting incoming missiles and fighters, and general point-defense. Other lasers are used to repair equipment by both the Covenant, and the UNSC while the only infantry-portable laser weapon is used by the UNSC, the M6 Grindell/Galilean Nonlinear Rifle or "Spartan Laser". During the Human-Covenant War, the UNSC began using nuclear bomb-pumped X-ray lasers as warheads for anti-ship missiles, such as the M4020 Bident used by Epoch-class heavy carriers. In the post-war era, Hannibal Weapon Systems has experimented with mounting laser weaponry on its testbed XM820B4 Scorpion tanks.

Plasma

One of the most commonly used directed-energy weapons, the Okarda'phaa-pattern plasma rifle.

Main article: Plasma weaponry

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 guidance systems. Infantry weapons commonly use guided plasma, such as the Plasma Rifle, Plasma Pistol, and the Plasma Grenade. Towards the end of the Human-Covenant War, the UNSC began using nuclear-pumped "focused plasma spears" in ship-to-ship missile warheads.

Electrolaser

A Sicatt Workshop shock rifle.

Weapons that make use of electrolasers include the Banished-made Sicatt Workshop shock rifle. This weapon's electrolasers consist of electromagnetically-guided plasma beams capable of disabling electronics components of vehicles and even MJOLNIR Powered Assault Armor via electromagnetic pulse.

Hard Sound

Hard sound is used in specialized rifles used by assassins of the Office of Naval Intelligence, used in special assassination missions against political leaders and others who pose a threat to ONI. Hard sound kill their target instantly by obliteration their internal organs and by causing cerebral haemorrhage. It leaves no residue, or any traces, making it virtually untraceable in forensic investigations. It is very silent, making it useful in stealth.

Particle beam weapons

A Type-50 particle beam rifle.

Main article: Particle beam weapon

The Covenant also uses accelerated particles as weaponry, such as the devastating capital ship mounted energy projector and the infantry Type-50 particle beam rifle. 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.

Ionized Particles

A Scattershot.

Not much is known about this type of weapon other than it is exclusive to the Forerunners and shares traits from both plasma and particle beam weapons. Aggressor Sentinels use a powerful continuous firing beam type called the Sentinel Beam as their main weapons. Many Promethean weapons are this type and have a tendency to disintegrate targets, and bounce off solid surfaces. The ionized particles fired by these weapons can come in a variety of colors, including gold, orange, purple, and blue.

Hard light

A Z-250 lightrifle.

Main article: Hard light

Weaponized hard light seems to be exclusive to the Forerunners as the Covenant never managed to fully reverse-engineer the technology.