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Mogai class
Affiliation: Romulan Imperial Fleet;
Imperial Romulan State
Type: escort, heavy warbird
Service period: 24th century,
25th century
(alternate timeline)
Length: 603.5 meters
Width: 911.4 meters
Mass: Unknown
Crew: 900
Maximum speed: 9.95
Armaments: 12 disruptors,
6 photon torpedo launchers
Defences: Shields,
cloaking device

The Mogai-class (also referred to as Valdore-type, Valdore-class, or Norexan-class), was a kind of Romulan warbird in service in the late 2370s and early 2380s.

The class is unnamed in its original appearance in Star Trek Nemesis, and Memory Alpha's article uses the name Valdore-type after the only canonically named example of the class. Some post-Nemesis novels refer to the design as Valdore-class, while other novels and Star Trek Online dub it the Mogai-class. The name Norexan-class is given in the Star Trek Customizable Card Game.


The Valdore-class was most likely made in response to the Klingon Negh'Var-class or the Sovereign-class starships. The IRW Valdore, flagship of Commander Donatra of the Romulan Imperial Fleet, was a Valdore-class ship. (TTN novel: Taking Wing)

The commanders of several Valdore-class warbirds were loyal to Donatra, the vessels later came to make up part of the fleet of the Imperial Romulan State once Donatra declared its existence and herself to be its empress. (TNG novel: Q & A; ST novel: Articles of the Federation)

After the Hobus supernova of 2387 many Valdore-class warbirds fell into the hands of Obisek's Reman Resistance. Others were acquired by the Romulan Republic and made part of their fleet. (ST video game: Star Trek Online)

A Reman Valdore class warbird

By the 25th century the Valdore class are also used by the Remans. They are identical to Romulan Valdore class except for their coloration, which favors a grey hull and green nacelles.

Technical data[]

Physical arrangement[]

Similar in design to the D'deridex-class warbird, the Valdore-class was a large, fixed-wing vessel, ranging in color from dark-green to brown.

With a wingspan roughly 900 meters wide, the vessel featured a large section extending forward to create a down-sloped head shape. Warp nacelles were connected at the end of each wing with impulse engines mounted aft. The hull was marked by distinctive "feather" shaped plating. (TNG movie: Star Trek Nemesis)

Tactical systems[]

Ships of the Valdore-class featured several forward-mounted disruptor banks located on each wing and some on the forward section of the ship. It had at least one forward torpedo launcher able to fire four plasma torpedoes for each recharge. Several members of this class were outfitted with an experimental phase cloaking device. (ST - Typhon Pact novels: Plagues of Night, Raise the Dawn)

Main bridge[]

Donatra on the bridge of the Valdore

The command center of the Valdore-class consisted of a roughly circular room distinguished by several console positions. With computers lining the rear bulkheads, a center seat or command chair and free-standing console were flanked by two additional stations. As another contrast to the D'deridex-class, the viewscreen of the Valdore-class was oval shaped. (TNG movie: Star Trek Nemesis)

Class variations[]


In the early 25th century, the Mogai-class heavy warbird was available in four variants: basic, retrofit, Fleet Mogai and mirror. Differences among the subclasses were equipment, hull durability and power levels. Basic Mogais were cruisers commanded by officers with the rank of commander or higher. Retrofits were available to RRF officers with the rank of admiral. The fleet variant required support by Starfleet or the KDF to be obtained. The mirror universe counterpart featured a different bridge officer seating and a distinct livery.

The class also spawned two sub-variants, the Valdore-class and Morrigu-subclasses. (STO video games: Legacy of Romulus, Delta Rising)


By 2409, a total of nine basic livery designs was available to choose from for RRF officers, which could be modified further. These options were known as: Romulan Type 1, 2 and Type 2 (Brown), Type 3, Reman Type 1 and 2, and Fleet Mogai, Veteran and Mirror. (STO mission: "Explore the Flotilla")

In addition, the installation of shields from specific factions modified the hull appearance, including shields from the Reman Resistance, the Breen Confederacy and the Dominion. (STO missions: "Coliseum", "Cold Storage", "Boldly They Rode")

Known vessels[]

Romulan Star Empire[]

  • IRW Dekkona
  • IRW Dominus
  • IRW Intrakhu
  • IRW Kytonis
  • IRW Rohallhik
  • IRW Soterus
  • IRWTerrinex
  • IRW Eletrix
  • IRW Valdore
  • IRW Delenix
  • IRW Aj'rmr
  • IRW Areinnye
  • IRW Bloodfire
  • IRW Elieth
  • IRW Makar
  • IRW Taseiv
  • IRW Tyrava
  • IRW Esemar

Imperial Romluan State[]

Reman Resistance[]

  • Zdenia

Alternate mirror universe[]