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The title of this article is conjecture. Although the subject of this article is canon, no official name for it has been given.
The Zweihänder is a Germangreatsword which, owing to its enormous size, functions more like a polearm and typically incorporates a secondary grip.
The final stage in development from the longsword, the Zweihänder is a weapon of monstrous size, unprecedented at its inception. Its blade is longer than the average height of an adult human, granting it devastating striking power and eclipsing the Scottish claymore. To accommodate this, Zwehänders evolved to incorporate a secondary grip atop the crossguard called a ricasso. In some variants, this was merely an unsharpened portion of the blade at the base but in more sophisticated designs, it was of the same construction of the hilt itself, resulting in what would appear to be two hilts on top of one another, each with their own guard.
A variant of the Zweihänder is the flamberge, named for the undulating shape of its blade reminiscent of a flame.
In Assassin's Creed: Unity, the names claymore, long sword, bastard sword, and great sword are haphazardly applied to its selection of two-handed swords without distinction, resulting in all-around erroneous labels. A majority of these swords are, in fact, properly called Zweihänders although this name itself does not appear in the game.