The seventh and last of the Gundams, the Epyon was created by former OZ leader Treize Khushrenada, based on data from the Tallgeese and the previous Gundams. Designed and built by OZ leader Treize Khushrenada during the political and military chaos occuring in AC 195, the OZ-13MS Gundam Epyon was intended to be the physical manifestation of Treize's martial ideals.

Rather than incorporating ranged weapons used by "cowardly" soldiers with no warrior's sense of fulfillment, Treize armed the Epyon with only two weapons: a razor-sharp, retractable tentacle heat rod and a large beam sword. The Epyon's beam sword, connected via cable to the Gundam's generator, is the most powerful melee weapon ever used by a mobile suit. Its only other weapon is a multi-segmented, heat-radiating whip called a heat rod, which is attached to its shield. The Epyon can also transform into a mobile armor mode for high-speed flight both in space and in Earth's atmosphere. And last, but certainly not least, it's equipped with a mind-bending Zero System similar to that of the Wing Gundam Zero: one that interfaced directly with the pilot's mind, eliminating all doubts and fears and providing its pilot with unquestionable knowledge of his enemies and the ability to achieve total victory.

Source: Gundamproject.com, New Mobile Report Gundam Wing