Battle Smasher

The Smasher is a prosthetic right arm belonging to Zephyr.

Appearance
The Smasher is a gigantic mechanical arm with three-pronged fingers, big enough to hold a full-grown person, a Gatling-gun design for the wrist and forearm on the outside portion, in which the inside is a giant cannon barrel, held together by large bolts at the wrist. The arm is connected to Zephyr's right arm at from his elbow, and an additional artificial upper forearm connected to his shoulder, and held together by two mast rigging around his chest for further support. Due to the strain of the mechanism and Zephyr's old age, he has to take some sort of steroid-like medicne in the form of a inhaler in order to wield it.

Abilities
Zephyr used the Smasher as a powerful bludgeoning weapon; being imbedded with Kairoseki, it was effective for combating against Devil Fruit users, especially against Logia-class. Inside the Smasher is a powerful cannon and a machine gun turret.

Named attacks

 * Smash Buster (スマッシュバスター): A big bullet which causes a huge explosion able to throw away Borsalino.
 * Smash Blaster (スマッシュブラスター): Long-rage version of Smash Buster.
 * Smash Tornado (スマッシュトルネイド): Zephyr shoots on the ground, causing a big explosion of dust, then he shoots a rapid sequence of bullets, similar to a Gatling gun.

Acquisition
When Zephyr was 65 years old, a very powerful pirate cut off his arm during a brutal battle that left only him, Ain, and Bins alive when all of their other comrades were killed. The Marine scientists then built the Smasher to replace that severed arm, which took five years to complete, as Zephyr did not receive his arm until age 70.

One Piece Film Z
Zephyr uses it as major fight weapons during almost all the events of One Piece Film Z, until the fight against Luffy, where the pirate succeed to damage it. After this, Zephyr unfasten it, letting it fall on the ground. Later, it's recovered by Ain and Bins who use it to make Zephyr's grave.