The Bakuryūha (爆流破, Backlash Wave, "Explosive Stream Blast") is the ōgi (the ultimate secret technique/finishing move) of Tessaiga. The technique builds up from the the Kaze no Kizu, the base technique of Tessaiga, and can only be used by someone who has already mastered that move. When an opponent with strong yōki unleashes an attack, Tessaiga can use the Kaze no Kizu to engulf the enemy's attack in a twister and reverse its flow back on them, with the added power of the Kaze no Kizu.
Inuyasha instinctively learned and mastered the technique while in the midst of his battle with Ryūkotsusei. The user's yōki must be greater than the opponent's own yōki or else the technique cannot be used, as explained by Tōtōsai after Inuyasha discovered it. Inuyasha also found the opponent's yōki must not be too far below his own levels or else the winds that compose the technique won't even form itself. He was soon pitted against a Lizard demon who's yōki was so weak that he found himself unable to summon the Backlash Wave.
Inuyasha used the technique again during a battle against Sesshōmaru, during which Sesshōmaru was able to reverse the flow of the Bakuryūha using only his yōki. In the aftermath of Naraku's transformation at Mount Hakurei, Naraku was able to engulf either the Bakuryūha or the Kaze no Kizu in his own yōki, turning Inuyasha's attacks back at him.