When the XXXG-01D Gundam Deathscythe was captured and destroyed by OZ's forces in AC 195, the extremely durable gundanium-made remains of that mobile suit were taken to OZ's lunar base and mobile suit factory for storage. The five scientists who had built the Gundams plaguing OZ were also at the lunar base, captured and forced to develop new mobile suit technology to secure OZ's rule over Earth and the space colonies. Despite their apparent "cooperation," however, the scientists also began rebuilding the Deathscythe in secret, preparing for the day when captured Gundam pilot Duo Maxwell could return to the battlefield. That opportunity came when the Romefeller Foundation - the political force behind OZ - became split over a number of issues, and the "Treize Faction" of OZ attacked the lunar base, which at the time was still under the control of Romefeller loyalists. During the chaos, Duo managed to escape, taking his rebuilt XXXG-01D2 Gundam Deathscythe Hell to continue fighting on his own. At that time, the Deathscythe Hell was only seventy percent complete; later repairs and field upgrades would allow Duo to complete the resurrected mobile suit, bringing it up to its full combat potential.