299,792,458 m/s! An energy projector, more commonly known as a glassing beam, was a Covenant ship weapon that fires a concentrated beam of plasma energy. The beam is charged by the ships pinch fusion reactor. It's then accelerated through gravitic impellors and magnetic lensing to reach the speed of light. The beam has an effective range of over 100,000 km (for perspective, that's the width of the Ark) which means it's capable of sniping any ship it engages from extreme distances. This weapon was responsible for billions of human deaths during the Human-Covenant War.