Tsang Wuqiong, the August Emperor of Jade, the Infinite King
Some sovereigns prefer a different sort of tax from their subjects - whether freely given, or taken by force.
The hammer of a war-god avatar, this massive weapon must be wielded by a giant or other supernaturally strong being. When struck against the ground, a massive seismic wave will propagate outward from the wielder subjecting all in its wake to a massive earthquake. This quake is strong enough to shatter castle walls.