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.

Eighty-six years later, he used it to use Blasting Barrage to destroy the Grim Comet's layers while Tōga destroy the demons inside with the Meidō Zangetsuha.

Physical Description
It has a dark wine-red hilt studded with yellow, as does its sheath.

Abilities
Supreme Demonic & Stellar Energy Storing: Originating from the infinite cosmos itself, it possess nearly infinite amount of stellar power as well as that of demonic energy, being created by the almighty God of the Stars himself. However, such abilities are negative and quite destructive as they are lethal. These powers are equal to its positive counterpart.


 * 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 temporarily enhanced Crimson Backlash Wave even when using Riku's sword.
 * 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 had utilized this potentially fatal attack on Toga in one of the many battles, which he eventually used to destroy the Half-Demon Princesses once and for all. Once it makes contact with a demon of any power level or status, the demonic energies it is comprised of is such that it gradually strips its target of their vital haku (demon and human's life-force essence allows the body to be mobile) until they perish entirely.

Trivia

 * The way it has a powerful weapon of equal magical strength and abilities is just like the Moonstone from Rapunzel's Tangled Adventure, and the Scepter of Night from Elena of Avalor; all three can have their negative and fatal effects undone and neutralized by its opposing weapon possessing all existing positive forces.