Asuramaru
Black Demon of the series. The black katana with a green edge and golden mountings: Yū's weapon and the vault's centrepiece.
Asuramaru is one of the Black Demons sealed in the depths of the 
armory. The black katana with a green edge and golden mountings: Yū's weapon and the vault's centrepiece.
Stats
It handles like a sword (sweep attack included). For comparison: a Netherite sword deals 8 damage at 1.6 (12.8 per second) and lasts 2,031 uses; Asuramaru deals 10 damage at 1.8 (18.0 per second) and lasts 3,200 uses.
- Fire and lava resistant, like Netherite.
- No material repairs it at the anvil.
- Shown in 3D in hand; its green parts glow in the dark.
How to get it
In the Black Demon vault of the sealed armory (y = -55), on its 
chest at the end of the aisle, facing the entrance: right-click to take it. You first need to open the sealed gate, then feed the 
Demon Lock. It is also in the creative tab.
Only one per armory. See the whole series: The Black Demon series.
Gallery
See also
The Black Demon series
The seven weapons sealed at the bottom of the armory: Asuramaru, Kiseki-ō, Gekkōin, Byakkomaru, Mahiru-no-Yo, Raimeiki and Shikama Dōji.
Kiseki-ō
Black Demon of the series. A jagged black blade, fast, trailing a cord: the quickest of the Black Demons.
Gekkōin
Black Demon of the series. The tall black bow with two green discs: the only ranged Black Demon.
Byakkomaru
Black Demon of the series. A long bayonet weapon with a red cord. In the mod, it is wielded in melee.
Mahiru-no-Yo
Black Demon of the series. The black katana with a red edge and a crimson grip: the strongest katana in the vault.
Raimeiki
Black Demon of the series. The black katana with a green edge and a purple-and-white braided grip.