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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 .

: It is a shikomizue , a Japanese sword concealed within a walking cane. 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. The "solid piece" related to is likely Soul

The One Piece Wiki provides a full breakdown of the sword's history and Brook's soul-based powers. Soul Solid - One Piece Wiki * Straw Hat Pirates. * Non-Canon. * Pirates. * Marines. One Piece Wiki How Legit is Brook's Cane Sword in One Piece? #shorts This allows him to transfer the "chill of

: 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.