This class of vessel was heavily armed, possessing at least two forward particle beam emitters. The hull of this class of vessel was constructed of polyduranium.
Prior to 2153, two Osaarian merchant ships entered the Delphic Expanse, looking for new trade routes. While in the Expanse, the ships were hit by a distortion wave, causing the crews to decide to return home. One of the ships was destroyed trying to return through the thermobaric cloud perimeter. The second ship remained in the Expanse, and the crew was forced to turn to piracy to survive. (ENT: "Anomaly")
When the Osaarian merchant ship was introduced in the final draft script of "Anomaly", it was referred to as "an ominous-looking MARAUDER VESSEL". From that point on, the script commonly referred to this type of craft as a "Marauder Vessel". In the final draft script of "Extinction", the vehicle was likewise referred to as "the marauder ship", though vessels of this configuration are called "merchant ships" on screen in "Anomaly". The script of that installment additionally referred to the weaponry on the Osaarian ships as disruptors and stated that one of these vessels would be defeated by phase cannons and three photon torpedoes, though the craft is actually shown to be foiled by only two photonic torpedoes in the final edit of the episode.
The Osaarian merchant ship was designed by John Eaves, based on an upside-down mini shovel he kept on his desk. Early sketches described it as a "Maurader Attack Vessel" [sic] and a "Ktarian maurader" [sic]. The CGI model of the craft was rendered by Pierre Drolet.