ZGMF-X12A Testament Gundam

The RGX-00 Testament is a prototype special operations mobile suit used by the Earth Alliance. The Testament was originally built as ZAFT's ZGMF-X12A Testament, but was never fielded in combat by ZAFT and was acquired through unknown means by the Alliance. It is not currently known whether Testamant's has been modified from its original design. Testament bears a resemblance to the ZGMF-X12 Astray Out Frame, which was built by Junk Guild technician Lowe Guele using parts from an incomplete ZGMF-X12A frame, and some have speculated that Testament and Out Frame were built from components of the same mobile suit.

The Testament's fixed armaments consist only of 2 waist-mounted beam sabers, 2 chest-mounted CIWS guns, and a pair of Mirage Colloid Virus Spreaders, derived from those of the NMS-X07PO Gel Finieto, which allow Testament to infect the computers of nearby mobile suits with a virus that disables their controls. This system is located in the two large horns on Testament's head. In addition, the Testament can use the Trikeros Kai, a large shield which wraps around the right arm and mounts three claws, a beam gun, and a retractable sword blade, and stores a pair of beam pistols. Testament can also be equipped with the AQM/E-X05 Divine Striker, a Striker Pack which serves as a high-mobility flight system similar to the Aile Striker, and is also capable of forming a giant grappling claw. Testament can also equip the older Striker Packs designed for the GAT-X105 Strike Gundam, and is equipped with Variable Phase Shift armor and a stealth system. The stealth system's technology has not yet been revealed, but it does not involve the Mirage Colloid system used by the GAT-X207 Blitz, GAT-SO2 N Dagger N, and AMF-103A DINN RAVEN. Instead, it seems to prevent sensors from registering Testament, but has no effect on the naked eye. It is possible that this is achieved through its Mirage Colloid Virus Spreader system.

Testament's combat debut comes during the "Break the World" terrorist attack, during which its masked pilot Ash Gray (a former ZAFT pilot who pilots the ZGMF-X11A Regenerate Gundam previously, whose presence in the Alliance military is not yet explained) interferes in the attempts of the Junk Guild, Serpent Tail, Rondo Mina Sahaku, and Astray Out Frame pilot Jess Rabble to push the remains of Junius Seven off course using GENESIS Alpha. Ash severely cripples Out Frame and damages the MBF-P01-Re2 Astray Gold Frame Amatu, but is driven off by a beam blast from ReHOME. Out Frame is then rebuilt as the ZGMF-X12D Out Frame D, which is largely indentical to Testament aside from the head, chest, and lack of VPS armor. Piloted by mercenary Kaite Madigan and co-piloted by Jess, Out Frame D defeats Testament, and Ash commits suicide by opening the cockpit hatch with his helmet removed, exposing himself to the vacuum of space. Afterward, Kaite adds Testament to his collection of mobile suits, equipping it with his beam gun/revolver and modifying the VPS to include his personal white cross emblem.

ZGMF-X12A (RGX-00) Testament
Manufacturer: Zodiac Aliance of Freedom Treaty User(s): ZAFT, Earth Alliance Unit type: prototype special operations mobile suit Head height: 17.71 meters Weight: 46.4 metric tons Special equipment: Variable Phase Shift armor, Neutron Jammer Canceller, Cosmic Mirage Colloid Virus Spreader, stealth system Powerplant: Ultracompact nuclear fission reactor, power output unknown Armament: 75mm "Igelstellung" CIWS x2, beam saber x2, Mirage Colloid Virus Spreader x2 Optional armament: Trikeros Kai offense/defense system (beam gun x1, claw x3, sword blade x1) x1, beam pistol x2, beam gun/revolver with bayonet x1 Pilot(s): Ash Gray, Kaite Madigan

RGX-00+AQM/E-X01 Aile Testament
Manufacturer: Zodiac Aliance of Freedom Treaty User(s): Earth Alliance Unit type: prototype special operations mobile suit Head height: 17.71 meters Weight: unknown Special equipment: Variable Phase Shift armor, Neutron Jammer Canceller, Mirage Colloid Virus Spreader, stealth system, AQM/E-X01 Aile Striker Powerplant: Ultracompact nuclear fission reactor, power output unknown Armament: 75mm "Igelstellung" CIWS x2, beam saber x4, Mirage Colloid virus spreader x2 Pilot: Ash Gray

RGX-00+AQM/E-X02 Sword Testament
Manufacturer: Zodiac Aliance of Freedom Treaty User(s): Earth Alliance Unit type: prototype special operations mobile suit Head height: 17.71 meters Weight: unknown Special equipment: Variable Phase Shift armor, Neutron Jammer Canceller, Cosmic Mirage Colloid Virus Spreader, stealth system, AQM/E-X02 Sword Striker Powerplant: Ultracompact nuclear fission reactor, power output unknown Armament: 75mm "Igelstellung" CIWS x2, beam saber x2, Mirage Colloid virus spreader x2, "Schwert Gewehr" 15.78m anti-ship beam sword x1, "Panzer Eisen" rocket anchor x1, "Midas Messer" beam boomerang x1 Pilot: Ash Gray

RGX-00+AQM/E-X05 Divine Testament
Manufacturer: Zodiac Aliance of Freedom Treaty User(s): Earth Alliance Unit type: prototype special operations mobile suit Head height: 17.71 meters Weight: unknown Special equipment: Variable Phase Shift armor, Neutron Jammer Canceller, Mirage Colloid Virus Spreader, stealth system, AQM/E-X05 Divine Striker Powerplant: Ultracompact nuclear fission reactor, power output unknown Armament: 75mm "Igelstellung" CIWS x2, beam saber x2, Mirage Colloid virus spreader x2, heavy claw x2 Optional armament: Trikeros Kai offense/defense system (beam gun x1, claw x3, sword blade x1) x1, beam pistol x2 Pilot(s): Ash Gray

RGX-00+AQM/E-X05 Divine Testament Kaite Madigan Custom
Manufacturer: Zodiac Aliance of Freedom Treaty User(s): Kaite Madigan Unit type: prototype special operations mobile suit Head height: 17.71 meters Weight: unknown Special equipment: Variable Phase Shift armor, Neutron Jammer Canceller, Mirage Colloid Virus Spreader, stealth system, AQM/E-X05 Divine Striker Powerplant: Ultracompact nuclear fission reactor, power output unknown Armament: 75mm "Igelstellung" CIWS x2, beam saber x2, Mirage Colloid virus spreader x2, heavy claw x2 Optional armament: Trikeros Kai offense/defense system (beam gun x1, claw x3, sword blade x1) x1, beam pistol x2, beam gun/revolver with bayonet x1 Pilot(s): Kaite Madigan

Trivia
Testament's head crest displays the text "DODICI", which means "Twelve" in Italian and is a reference to its model number, and the letter "A", referring to its nuclear power plant.