Kessui

The Kessui is Hannyabal's signature weapon. It is a naginata, a Japanese spear, 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, the Kessui can be a powerful weapon.

Abilities
Hannyabal has show to be very skilled wielding the Kessui. He could spin it rapidly to create flames from friction to deter his opponents.
 * Hannya Carnival: Shōnetsu Jigoku Guruma (ハンニャカーニバル 焦熱地獄車): Along with fanfare being played by guards alongside him, Hannyabal twirls the sword in such a way that it creates two flaming wheels at his sides. In the Viz Manga, this is called Hannya Carnival!! Inferno Hell Wheel. In the anime this is called Hannya Hustle Dance: Shounetsu Jigoku Guruma. In the FUNimation subs this is called Hannya Hustle Dance: Inferno Hell Wheel.