Plasma

See Plasma on Wikipedia here. Plasma is negatively-charged gas, the fourth state of matter, besides solid, liquid, and gas. It is often utilized in superheated form by the technological Covenant for weaponry. It has many applications in the Halo universe, as below:

Starship Weaponry

 * Plasma Torpedo
 * Plasma Turret
 * Plasma Charge

Vehicular Weaponry

 * Seraph
 * Banshee
 * Wraith
 * Specter
 * Phantom
 * Ghost

Turrets

 * Shade
 * Shielded Plasma Cannon
 * Plasma Cannon

Explosives

 * Plasma Grenade

Firearms

 * Energy Sword
 * Plasma Rifle
 * Plasma Pistol