The Staff of Ku was a mystical staff. Although not a Shen Gong Wu, it could be wagered in a Showdown, like the Blue Moon Blade.
It was a long, marron staff with a fake eye on the top of it
The staff could turn into a shield that was strong enough to withstand the power of strong attacks, such as an ehanced water attack from the Orb of Torpedo. Additionally, the Staff of Ku could create energy blasts and manipulate lava and magma.