Antimatter charge
From Halopedia, the Halo wiki
The Antimatter Charge is an explosive weapon used by the Covenant[1]
They use antimatter charges in a variety of ways. To blow through ship armor during boarding action, or as anti-vehicle and anti-personnel weapons. These appear to be the choice explosive of Ranger Elite teams, as they have sometimes been used to destroy Magnetic Accelerator Cannons on board ships.
Any contact between antimatter and normal matter causes a complete conversion of mass to energy, causing a release of electromagnetic radiation.
Only one kilogram of antimatter reacting with one kilogram of matter would yield an explosion of 42.96 megatons, which is almost equivalent to three thousand Hiroshima-bombs (45 Mt combined). Antimatter-matter is the most efficient way of liberating energy, E=mc². E being energy equals mass times the speed of light squared.
