A second generation GAT-X machine, Forbidden is designed for infiltrating and raiding enemy bases and to fulfil this role, it can transform into a "High-Speed Assault Form" by flipping its huge backpack unit over its head. Like the other two second generation units, Forbidden is equipped with Trans-Phase Armor (TP armor) and as shown by its model code, it utilizes a X200-series frame like the GAT-X207 Blitz Gundam, and as such it is also equipped with special equipments. Its armaments consists of head-mounted CIWS, forearm-mounted machineguns, a handheld scythe and backpack-mounted railguns and plasma cannon, both of which can only be used in "High-Speed Assault Form".
One of Forbidden's special equipment is the "Geschmeidig Panzer" energy deflection armor installed in its two massive shields, this equipment can deflect any range beam attacks that hits it, making the Forbidden virtually invulnerable to these attacks. Coupled with the fact that the shields themselves also have TP armor, Forbidden is thus well protected from most beam and physical attacks. In addition, the "Geschmeidig Panzer" also allows Forbidden to move underwater with ease, even though it is not specifically designed for aquatic use. Another special equipment is the beam arching equipment installed on the railguns, they allow the bending of the beam produced by the plasma cannon, making the attack harder to evade. Due to the powerful thrusters in the backpack, which is actually a specialized flight unit, Forbidden has full flight capability in the atmosphere and is one of the rare mobile suits to be capable of both aerial and aquatic combat without any additional equipments. [Source: wikia]
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