Zanseiken

 is a sword wielded by the Dog-hanyō Towa Higurashi. She acquires the sword in The Second Act of Hanyō no Yashahime. It is one of the two swords given by the god of stars,. The other is Kirinmaru's Bakuseiken.

Physical Description
The Zanseiken has a gold guard in a style similar to that of Kirinmaru's armor with a deep blue jewel embedded in it.

History
After Towa plays the Star-Slicer Flute, it turns into the Zanseiken and fight against the Demon Spirit Beast. As she dodged from the green demon spirit's attack she was surprised that Kyūyōkon can absorb.

Powers & Abilities

 * Enhanced Slashing: As it is empowered by Towa's demonic energy, its ability to slice through solid objects is more effective.
 * Power Absorption: Having the Kyūyōkon Root as part its formation, the Zanseiken can absorb large quantities of demon energy.
 * A stronger and more effective technique used by Towa, from the tip of her energy blade, she can unleash a powerful demonic energy wave in the form of a colossal blue-white twin head dragon, Kirinmaru was the one whom gave it the name.

Trivia

 * The Zanseiken was teased at the end of the first season finale.
 * The blue stone looks reminiscent of the Blue Rainbow Pearl.
 * A special flute known as Hoshikiri no Fue works in conjunction with this sword. When played, the flute transforms into the sword.
 * The Zanseiken is the second yōkai sword shown to transform, the first being Tessaiga.