A small number of the prototype close combat mobile suit MS-08TX Efreet was produced by the Principality of Zeon, and one such machine was operated by Doug Schneid of the Marchosias Corps during the One Year War. Fred Reber, who took over this machine from Schneid, continued to operate it after the end of the war, but had to let go of the machine later for various reasons. It was eventually reacquired by Fred, who renamed it as "MS-08TX/S Efreet Schneid" in honor of its original pilot, Doug Schneid.
As a result of continuous modifications since the One Year War, the Efreet Schneid's generator output has nearly doubled compared to the original model, rivaling the output of the Earth Federation Forces's new model in U.C.0096, the RGZ-95 ReZEL. The high-power output was used to increase the drive torque of the actuators, and the resulting instantaneous power gave the Efreet Schneid a higher level of combat performance. Along with the enhanced generator, the chest intake has also been replaced with one with higher heat exhaust efficiency.
During the Laplace Incident, in response to a request for support from the Kirks Corps, the MS-08TX/S Efreet Schneid was deployed with other Zeon remnant units to attack the Torrington Base, and was last seen defeating a RMS-179 GM II Semi-Striker in close quarters combat. After the attack on the Torrington base, this machine operated alongside pirates to target the base of Kirks Corps. However, its pilot, Fred Reber, was actually a spy sent to the pirates by the Zeon remnants, and has been secretly passing information about the pirates' attacks to the remnants. When the pirates' Gaw attack carrier was destroyed by the RX-160S Byarlant Custom, he defected from the pirates, shot down the MS-07H-8 Gouf Flight Type and AMX-011 Zaku III piloted by the leader and his entourage, and then retreated to parts unknown.