From Halopedia, the Halo wiki
These starships are equipped with multiple pulse laser turrets, four point-defense guns and one-three plasma turrets on a lateral surface. They have participated in most Covenant-UNSC ship-to-ship engagements. Although smaller than most other Covenant capital ships, they are still larger than a UNSC frigate or UNSC destroyer. Like most other Covenant warships, frigates have a curving, bulbous shape and are equipped with energy shields.
Furthermore, the Sangheili equipped their warships with anti-plasma torpedo "counter guiding signal" systems. The Jiralhanae stole this technology during the Great Schism and equipped some of their frigates, such as the Revenant, Twilight Compunction and Tenebrous, with such devices. However, they did not understand the full intricacies of the system, thus limiting their effectiveness. In addition, several frigates had at least one hangar bay that could hold Type-27 Banshees.
After the war's end, numerous frigates fell into the hands of various Covenant remnant factions, such as the Servants of Abiding Truth.
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