Battle Smasher

The Smasher is a prosthetic right arm belonging to Zephyr.

Appearance
The Smasher is a gigantic mechanical arm with three-pronged fingers, 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.

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 Rain (スマッシュレイン): A sequence of bullets shot in rapid succession, 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.