XEV9-Matos nonlinear pulse cannon
From Halopedia, the Halo wiki
The XEV9 fires an electromagnetic pulse that can be used to disable enemy warships. The weapon is capable of firing multiple times in quick succession, and is mounted below the upper hull and wings of the ship, requiring the ship to turn "belly-up" relative to its target to fire the cannon. In rare circumstances, the XEV9 offers coverage on forward-facing targets.
Two XEV9s are mounted on the underside of Sahara-class heavy prowlers like the UNSC Aladdin. In 2553, UNSC Port Stanley used its XEV9-Matos against the Hudal-class auxiliary vessel Piety, firing multiple shots to keep the vessel unable to communicate while Kilo-Five boarded the ship.
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