The Imperial Griffin Space Navy consider frigates and destroyers to be “cruiser escorts”, usually with two ships to a single larger cruiser or battle cruiser. Like all IGSN ships, frigates and destroyers rely upon missiles for long-range combat, unlike larger RESF ships that carry plasma torpedoes. With military organization of the Griffin Moot built around the named (i.e. the fleets of the nobility) and the numbered (i.e. the Space Navy proper), there are a lot of frigates and destroyers out there, and quite a few of them find their way into pirate hands.
After the end of the Horizon War, the IGSN has been looking into improved versions of the various classes of frigates and destroyers, with only a new destroyer class coming up on the horizon. However, the frigate may start to be seen only in second line service, and for courier duties for larger fleets.
The smallest single FTL warship in the IGSN, the Shadow-class frigate is 160 meters long and masses 9,700 tons, and the ship is built around a weapons fit of a 6cm buster launcher and two 3cm buster launchers on the broadsides. In addition, the ship carries two missile launch cells for twenty-four Asp anti-ship missiles (giving it the ability to launch four salvoes of six missiles each from the launchers).
The Shadow-class Frigate has the same issue as most other frigates in service-too small for most missions, too fragile to lie in the wall of battle in fleets, and it’s mission being taken over by increasingly better drones. What this ship mostly does in the IGSN is serve as a messenger ship for fleets, a light escort for convoys, and an escort for Peregrine-class exploration ships.
At 195 meters and 12,000 tons, the Marathon-class destroyer is built to serve as a heavy escort and counter-destroyer for fleet operations. Armed with two 6cm buster launchers in the bow and two 3cm broadside buster launchers, the ship also carries two missile launch cells for thirty Asp-class anti-ship missiles. This gives the class the ability to launch five salvoes of six missiles each. The class also mounts a slightly heavier point defense fit than standard, mostly in the form of more powerful point defense systems over number of installations.
The Marathon-class would see service in the Horizon War, mostly serving as an escort for fleets and similar operations. The class would see further construction after the Horizon War, with slight improvements added to various hulls in service.
At 195 meters and 15,000 tons, the Thermopile-class destroyer is built to replace the Marathon-class destroyer after the Horizon War. Incorporating the lessons learned in the war, the ship is armed with two 6cm buster launchers in the bow and two 4cm broadside buster launchers. The ship also carries two missile launch cells for thirty Asp-class anti-ship missiles. This gives the class the ability to launch five salvoes of six missiles each, similar to the lighter Marathon-class. The class also mounts a slightly heavier point defense fit than standard, mostly in the form of more powerful point defense systems over number of installations. The armor is also slightly heavier, especially in the bow.
The Thermopile-class destroyer is only starting to come out of the shipyards of the Griffin Moot, and most of these ships are coming into service with the numbered fleets.