Hisui akuma

Hisui akuma 翡翠 悪魔 (literally meaning "Jade devil") is the zanpakutō used by Hideki Yoshida.

ABOUT HISUI AKUMA
Hideki unseals his Zanpakutō with the command "Awake, Hisui Akuma!" It resembles a slender, twisted morning star and turns the ground beneath an opponent's feet to quicksand.