A modified version of the close-combat mobile suit MS-08TX Efreet, the Efreet Nacht, as its name suggested ("nacht" being German for "night"), was specialized for stealth operations and night combat. It was equipped with a powerful jamming system, capable of disrupting radar and mobile suit sensors. In order to improve stealth properties, the air ducts on the Efreet Nacht's chest were removed, and it was equipped with a new backpack that has retractable thrusters. A pair of twin thruster units were also equipped on its legs, improving its thrust. To avoid heat detection, its primary weapon was changed from the heat saber to a ninjato-style physical sword called Cold Blade. For ranged combat, it was equipped with four Cold Kunai for throwing, as well as a three-barrel Gatling gun concealed in the left forearm.
Originally one of eight Efreet units produced, this unit was transferred to Odessa during the One Year War and extensively modified under the order of Colonel M'Quve, becoming a specialized stealth and night combat mobile suit. It received a new designation: Efreet Nacht. However, after Zeon's defeat during Operation Odessa, the Efreet Nacht was left behind and captured by the Earth Federation Forces. The stealth technology obtained from it would later be used in the development of the RX-79BD-1ST Blue Destiny Unit 1 (Stealth).
In U.C. 0081, the Invisible Knights, a group of Zeon Remnants operating on Earth, learned of the Efreet Nacht's presence in Odessa and launched an attack on the Federation-occupied Odessa Base in order to capture it. Team leader Erik Blanke captured the mobile suit and immediately used it to devastate the Federation Forces, fighting off the responding Phantom Sweep Corps before withdrawing.