Vor'cha-class cruiser fires its disruptor cannon.
A disruptor cannon is a directed energy weapon commonly used aboard starships of many different species.
Klingon 22nd century Klingon Birds-of-Prey were equipped with an impressive arsenal, for the time, and included wing-mounted (and belly mounted) disruptor cannons and photon torpedo launchers. (ENT: "Borderland") These cannon were capable of firing in either disruptor pulse or beam modes. (ENT: "The Augments")
These weapons were also found in later designs of Klingon Birds-of-Prey, Negh'Var warships and Template:ShipClass cruisers. (DS9: "Blood Oath", "The Way of the Warrior"; TNG: "Redemption")
Background
According to the Star Trek: Deep Space Nine Technical Manual, Disruptor weapons generally carry more energy then standard phaser weapons but lack in accuracy and fast discharge.