Water-Dragon Sword

Water-Dragon Sword is a Shingu shown only in the prequel series, Akame Ga Kill!: Zero. It takes the form of a broadsword.

History
Water-Dragon sword, like all other Shingu, was created four hundred years before the start of the series by the emperor of that time in an attempt to create weapons that could surpass the Teigu.

It was kept hidden in the Empire's secret storage until It was given to Najasho by Gozuki. Its status is currently unknown after Najasho fell into a ravine.

Abilities
The Gravekeepes have applied the same transformation abilities that they use onto the water-dragon sword.

It's special ability allows the user to become extremely powerful for three minutes, but at a cost; the user becomes extremely fatigued after that time limit is expired.