- Note: the upgrade is identified on the box as "Storm Unit" in English, and "Sturm Unit" in Japanese. Both names are considered to be equally valid. For the red and gold version, see Sturm Tyrann
The Storm Unit (Or Sturm Unit, as it was known in the Japanese release) was the first armor unit produced for the Berserk Fury. This is the only Berserk Fury CAS design to have been released as an actual model kit. It is a melee-oriented version of the Berserk Fury, sporting two X-Breakers as its primary weaponry, as well as sporting a drastically increased top speed and improved armor.
Released as one of the Customise Parts, the Storm Unit was released in 2002 and was discontinued after a short run.
Introduced at the very end of the Guylos Empire, the Storm Unit helped the Berserk Führer defeat the Gunbluster Zoids that had been the only thing capable of stopping it. The extra speed allowed the Fury to fly past the Gunbluster's weapons fire and assault them from the flanks.
Utilising its newfound speed, as well as its improved armor, the Storm Unit proved to be an effective Zoid. However, it placed a great deal of strain on its pilots, and therefore only saw a limited role, notably by the Eisen Dragoons.
The Storm Unit has been seen in several Video Games as an alternate armor for the Berserk Fury. Notably, in Zoids Legacy, the unit was seen with several differences to the model. Firstly, it was called the Strum Fury (presumably a typo of Sturm), but more notably, its stats are quite different to the ones listed on the box. Its length is 22.7m, as opposed to 23.4, its weight is 134 tons, as opposed to 140, and its top speed is 360 km/h, as opposed to 450. These statistics are preserved in other games is the Saga series, so it is not a misnomer created by Legacy's poor translation.