Shinsō

The Shinsō (神鎗, God Spear), a  grade sword, is a shikomizue wielded by   Solo D. Jack. The sword, with its numerous forms and tremendous abilities, is counted among one of the twelve finest blades in the world. Many has speculated that much of Jack's power and fame is due to him being in possession of the blade.

Abilities
The blade is said to have been built in the by weapon-smiths of the , using technologies that are now lost and beyond almost anyone's comprehension. Using highly advanced nanotechnology, the weapon is capable of manipulating energy and taking on a number of different forms that grant different abilities. The blade seems to have a way of knowing who is wielding the blade as it seems to work for only certain people, and Jack himself was the first person in almost half a century to have been able to successively activate its powers. It has been speculated that only people with the  can truly activate the full powers of the blade.