Each destroyer carries a Shard Cannon, a fearsome anti-infantry weapon equivalent to a UCM heavy machinegun. Due to its heavy calibre and sheer weight of fire, the Shard Cannon can even be effective against light vehicles. As a broadly conventional firearm, the Shard Cannon is able to mow down enemy troops at a far greater range than standard issue plasma rifles. Destroyers are also armed with a miniaturised version of the Plasma Cannon, the Plasma Charger. While it is only charged for a single shot, the effect of a volley from these weapons is often devastating!
Destroyers have been known to literally blast their way through solid walls with brute force akin to a wrecking ball. They are usually unfazed by enemy opposition and can be expected to enter a building with guns blazing, seconds before crashing through the wall!
Full background and rules can be found in Reconquest: Phase 1