Kessui, One Piece Wiki

Kessui is Hannyabal's signature weapon. The Kessui is a peculiar-looking naginata (a Japanese halberd), with an extra-long spear-blade attached to each end. Each blade is an actual katana, complete with the hilt and guard, effectively making this two katanas linked together into a spear. With two blades and a long reach, Kessui can be a powerful weapon. While Hannyabal usually carries a pitchfork during his round of duty, he has never been seen using it (except during the anime, to fend off less

Kessui, One Piece Wiki

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Kessui, One Piece Wiki