Battle Smasher

This towering mechanical arm stands in for the missing right limb of Z, mounting onto what is left of his elbow while a synthetic upper portion runs up toward his shoulder. To carry the load, mast-style rigging is lashed across his chest, and detaching the whole rig demands a special key. Its hand closes into three heavy prongs broad enough to seize a grown adult, the outer forearm and wrist bear a Gatling-style layout, and tucked within the interior are a large cannon barrel plus a fairly normal working prosthetic hand. Big bolts clamp the pieces together at the wrist.

Z chiefly wielded the Smasher as a brutal bludgeon, yet its Seastone body opened a second deadly role: by clamping its giant hand shut around a Devil Fruit user, Logia types above all, it could seal away their powers and restrain them in one grab. That same material left the arm about as tough as diamond, so it soaked up explosions and withstood the recoil of its own strikes. Housed inside are both a formidable cannon and a turret mounting a machine gun. His labeled attacks include the point-blank Smash Buster, the far-reaching Smash Blaster, and Smash Tornado, which kicks up dust before pelting the airborne foe with rapid fire. The mechanism's stress, together with Z's advanced years, forced him to draw on a steroid-like medicine from an inhaler to keep it under control.

The arm is Z's alone. At sixty-five, in a savage fight that left standing only himself, Ain, and Binz, a powerful pirate severed the man's right arm, and Marine scientists then spent five years building the replacement, which he did not receive until he was seventy. He took it with him upon quitting his post as a Marine instructor and raising the Neo Marines. He fought with it through nearly the whole film, right up to the moment Luffy left a fist-sized dent in one finger during their last duel and the device began to fall apart. Once Kizaru's platoon killed Z, Ain and Binz recovered the Smasher and stood it up as his grave marker.