The Ren Fejin was a Breen privateer vessel. Like other Breen vessels, the Ren Fejin had an asymmetrical design.
In 2383, the Ren Fejin entered the Gamma Quadrant as part of a Typhon Pact force that intended to obtain Dominion technology. The Ren Fejin was later detected by the Jem'Hadar over Overne III and was boarded by Laas and several Jem'Hadar soldiers. (ST - Typhon Pact novels: Plagues of Night, Raise the Dawn)