What is a shobi-zue?

Answer 1

Its a short staff with hidden blade.

Answer 2

A shobi-zue is a type of cane or walking stick traditionally used by the samurai as a weapon in feudal Japan. It was designed to look like an ordinary walking cane but could conceal a blade or other hidden weapons inside. It was a discreet way for samurai to carry a weapon in public spaces where swords were prohibited.