Sōryūha

"Remember this well, Towa. Your attack, the Azure Dragon Wave, was created by Sesshōmaru. But you have made it your own by giving the dragon twin heads.From this day forward, you shall call it the "Twin Azure Dragon Wave"."

- Kirinmaru to Towa

is the signature move of Sesshōmaru's Tōkijin. A powerful burst of yōki is released and takes the form of a dragon. It draws its energy directly from Sesshōmaru, and varies in strength. It is even capable of overcoming the Tessaiga's Backlash Wave.

Towa Higurashi was able to use this move by enhancing her own demonic energy from the silver Rainbow Pearl to form an energy blade on a Replica of Kikujūmonji after it had broken. By harnessing her full demonic powers to their highest, she also able to unleash two dragon waves at once after witnessing the death of Setsuna by the hands of Lord Kirinmaru. The Beast King named it.

Trivia

 * Sōryūha is not shown in the manga.
 * It is also used in the two PlayStation 2 games: The Secret of the Cursed Mask and Feudal Combat.
 * In the third movie, Swords of an Honorable Ruler, Sesshōmaru is shown using Sōryūha with Tenseiga, although the movies are non-serial.
 * In Kagura's Wind, Sesshōmaru calls this technique "Azure Dragon Wave."
 * In The Dream-Gazing Trap, Riku stated that Towa must use the demon energy blade by the "Azure Dragon Wave" to defeat Kyūki.
 * The Sōryūha is a reference to the holy  of Chinese legend who opposed the four evil '', themselves represented by the Four Perils.

Appearances
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Movies

 * InuYasha the Movie 3: Swords of an Honorable Ruler (First usage by Sesshōmaru)
 * InuYasha the Movie 4: Fire on the Mystic Island

Final Act

 * Kagura's Wind (First time referred to as Azure Dragon Wave)

Season One

 * Gateway to the Past (First usage by Towa)
 * The Dream-Gazing Trap
 * The Night of the New Moon and the Black-Haired Towa
 * The One Behind the Forest Fire
 * The Trap of the Two Perils
 * Sesshōmaru and Kirinmaru
 * Sesshōmaru's Daughter (First usage of Twin Azure Dragon Wave)

Season Two
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 * TBD