The Knockout Nemesis 3000 is a weapon that is used by Chokun. It appears as a large sledgehammer with a black handle and a blocky gray head. According to its description, it is heavy enough to cause small tremors when used to strike the ground. It is similar to the Hammer.
It's not so much a hammer as a block-shaped boulder. A little on the heavy side, but a safe choice both in battle, hitting something really hard to get people's attention, or creating minor tremors to scare off an enemy army.