Antimatter
From Halopedia, the Halo wiki
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Template:Weapon Antimatter is the physical counterpart to matter. Antimatter consists of antiparticles whcih have the same mass as their matter counterparts but with a reversed charge. Antimatter annihilates upon contact with matter, theoretically releasing all energy; mainly in the form of photons.
The Covenent use antimatter as a reactant in ordnance.[1]
