Bakuseiken

 is a cosmic demon sword wielded by Kirinmaru. It is one of the two swords bequeathed by the god of stars,. The other being Towa's Zanseiken.

History
Kirinmaru used it to fight with Tōga, the Lord of the Western Lands 600 years ago in the, and not too long, the samurai tried to kill him by the orders of , but they were no match for him as he broke the katana with his sword with ease, until his daughter is captured by a vengeful half-demon named Sakasa who tried to avenge his master's death, so he beheaded him but was shocked to see his body kill his own daughter and slashes his head turn as a skull. 86 years later, he used it to use the Blasting Barrage to destroy the Grim Comet's layers while Tōga destroy the demons inside with the Meidō Zangetsuha.

Physical Description
TBA

Abilities

 * Blasting Barrage: Kirinmaru slashes his sword and releases a large slash of energy that fires multiple powerful energy projectiles capable of destroying the Grim Comet and easily overpowering Moroha's Crimson Backlash Wave even when using a normal weapon.
 * Unnamed Wind Blast: Kirinmaru blasted Moroha with this strong wind, similar to Ryūra's wind blast from Fūjinga and Setsuna's Cyclone Burst attack.
 * Unnamed Black Hole Technique: Kirinmaru fires from his sword a powerful black hole that was strong enough to plow through Towa's gigantic demonic dog projection of her father and overwhelm her ability to absorb demonic energy to where she was knocked unconscious.
 * Demon Fireball: Kirinmaru made the huge demonic fireball from his sword.