Bakuyagai is a Treasure Tool in a form of armor that is colored in brown clothes and black colored armor platings. Then, it has a scarf that is orange in color around neck to the waist. The yellow broach holds the scarfs together. It seems that the shoulder and base plates of the armor is seemed to be colored in pitch black.
Bakuyagai's ability is unknown throughout the series, however it is suspected that it provides basic protection for the user. It is known that it is kept by Yūji Sakai after the Second Great War, and so, it is presumed that it is not a part of the Snake of the Festival.
- Bakuya (莫夜 night ) (read as mò yè in Chinese) in the Treasure Tool's name is likely taken from one of the text in I Ching or the Book of Changes, one of the oldest Chinese classic texts; the book is about the divination system known as Geomancy which is still used until today. It is written by Fu Xi, the Chinese's semi-mythological ruler and cultural hero and also one of the three sovereigns in ancient China. In ancient times, "Snake of the Festival" had used the name Fu Xi.
|Offensive||Blutsauger • Bubble Loot • Chorde • Dance Party • Hystrix • Kiken no Kentō • Kisan no Taiken • Nietono no Shana • Regular Sharp • Traverso • Trigger Happy|
|Defensive||Azure • Bakuyagai • Orgel • Robe • Tarnkappe|
|Utility||Caina • Crystal Altar • Gehinnom • Giralda • Jettatura • Nine Eternal Divine Scales • Nomenclator • Obelisk • Reiji Maigo • Reshuffle • Saishuku no Shadan • Seireiden • Tendōkyū • Tessera|
|Miscellaneous||Atalante • Nachtigall • Trivia|
|Universal||Gordian Knot • Mekest • Shintetsu Nyoi • Tartaros • Trigon|