Seiryuutou

Seiryuutou (, Green Dragon Crescent Blade) is a Holy/Spirit Weapon, a guandao, which chose Seito Toujou as it's wielder.

Description
Deferring from the original Green Dragon Crescent Blade, used by the General Guan Yu from the historical novel Romance of the Three Kingdoms, which exists in China, instead, it is a version named the Seiryuutou that exists in Japan. Several renowned Onmyōji and Chinese Monks poured their powers and was strengthened by the faith of numerous people, which granted it tremendous power. The current owner of Seiryuutou, Seito Toujou is able to use power attributed to the air element, which is attributed to the four classical elements, as well as ice-based abilities letting him freeze a Shooting Figer such as Býleistr albeit in a sneak attack. It also possesses both dragon-slaying properties and can fire ki blasts from it's blade.

Through the combined efforts of both Seiryuutou, Táowù and someone who is able to use spatial spells such as Aoi Haruno who inherited the Suzaku's/Zhuque's power, it is possible to create a wide barrier that is able to replicate a complex area using the consciousnesses of the people residing there.

In Volume XIII, it is revealed that a copy of the original Guan Yu's spirit, named Kan'u Unchou, exists within the blade.

Trivia

 * The kanji for the Seiryuutou (青龍刀) is fully read as Seiryū Engetsutō (青龍偃月刀).