Fek'Ihri vessels follow a common design lineage and are marked by their rust-hued red hull coloration and their asymmetrical mainframe configuration. The central hull is dominated by a forward-facing, crimson deflector. Pincers can be found at the bow and three large, sail-like wings are mounted on its port, while down-facing stings adorn the starboard side. A single impulse exhaust, also red-colored, is facing rearward. Smaller engines are mounted at the back of the frigate's wings. The Fer'Jai Frigate has no visible windows.
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- “Blood of the Empire”: Ships of this class belong to a Fek'Ihri battle group, commanded by the Fek'Ihri Horde Leader, protecting the three portals in the Norgh System. Later, more of these vessels participate in the Fek'Ihri attack on Qo'noS.
- “Fleet Alert” (KDF): Fer'Jai Frigates make up a sizable portion of an armada of Horde ships attacking a Klingon starbase.
- “Afterlife”: A Fer'Jai Frigate squadron lurks in the orbit of Boreth to prevent the KDF from reaching the Shrine of Kahless. After the destruction of the Fek'Ihri ships a Kar'Fi Battle Carrier appears in the system.
Fer'Jai Frigates firing their antiprotons.