These cannons function as deadly antimatter railguns, firing massive 2000kg compressed positron shells at near-light speeds. Each railgun fires a subspace pulse (to provide shield penetration effects) which is used to provide short-term encasement to a packet of compressed positrons (which are suspended with electromagnetic fields until leaving the cannon). The positrons annihilate electrons they come in contact with, thus destabilizing and destroying molecules, and creating a surge of energy through the target. This weapon deals extremely heavy damage against any starship. Smaller starships or starships without high-end armor will likely be completely obliterated.
Anti-matter weapons should not be used in atmospheres.