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: It is a shikomizue , a Japanese sword concealed within a walking cane.

The "solid piece" related to is likely Soul Solid , the named shikomizue (cane sword) used by the character Brook in the manga and anime series One Piece . IMG_1670.MOV

: After the two-year timeskip, Brook learned to coat the blade with the aura of his soul. This allows him to transfer the "chill of the underworld" to the sword, freezing anything it touches. : It is a shikomizue , a Japanese

: Brook, the musician of the Straw Hat Pirates, uses it to perform high-speed fencing techniques, often finishing an attack before the opponent even realizes they've been cut. : It is a shikomizue