My entry for Bionicle Flagship Display's Big Weapon Contest. Spinereaver is 13" long and fairly heavy. Its wielder is not Schüssatt, he was just used as a manikin (credit to Yuri Fassio for the idea) as the the guy who wields it, Folterung, was built after it was destroyed.
Spinereaver can tear a person asunder, regardless of how much armor they are wearing. The huge weight of it requires a normal person to use both hands in an attack. Folterung only needs one hand, but he uses two for greater power. Folterung's preferred style of carrying the monstrosity is on his shoulder like a lumberjack.